Page 1


Preface

This Repair Manual is designed to facilitate repair of the engines listed in line with accepted technical principles. In addition to this Repair Manual the following publications are available: D Operating Instructions D Fuels, Lubricants and Coolants for MAN Diesel Engines D Spare-parts catalogue D Service record book with maintenance plan Note: Only use fuel, coolants and lubricants in accordance with MAN’s regulations otherwise the manufacturer’s warranty will not apply! For basic information on the fuels see the publication “Fuels, Lubricants and Coolants for MAN Diesel Engines”. You can find the approved products in the internet under: −http://www.mn.man.de/index/mn_eng/motor/serviceproducts.htm− The pictures and associated descriptions show typical work that may not always be applicable to the engine in hand, which nevertheless does not mean that they are not correct. In such cases, the repair work is to be planned and carried out in a similar way. It is compulsory that the engine be removed before performing any of the work describe in this Repair Manual. The expert knowledge necessary for handling Diesel engines was taken for granted when this publication was compiled. Any repair of components such as injection pump, alternator etc. ought to be left to our or the manufacturer’s service department.

Best regards MAN Nutzfahrzeuge Aktiengesellschaft Nuremberg Plant

We reserve the right to make technical modifications in the course of further development. © 2005 MAN Nutzfahrzeuge Aktiengesellschaft Reprinting, duplication or translation, in whole or in part, is not permitted without the written permission of MAN. MAN reserves all rights accorded by the relevant laws on copyright. MTDB

Technical status: 10.2005

1

51.99598−8123


Instructions

Important instructions which concern technical safety and protection of persons are emphasised as shown below. Danger: This refers to working and operating procedures which must be complied with in order to rule out the risk to persons. Caution: This refers to working and operating procedures which must be complied with in order to prevent damage to or destruction of material. Note: Explanatory descriptions which help in understanding the relevant work or operating procedure to be carried out.

Assembly of pipes Danger: No pipes may be bent. Risk of breakage!

Fitting flat seals / gaskets Flat seals / gaskets are often inserted with sealing agents or adhesives to make fitting them easier or to achieve better sealing. Flat seals may slip in operation due to the “sewing-machine� effect, in particular if they are used between parts with different rates of linear expansion under heat (e.g. aluminium and cast iron), and leaks may then occur. Example: The cap of the front crankshaft seal. If a sealing agent or an adhesive is used here the flat seal will move inwards in the course of time as a result of the different expansion rates of the materials. Oil will be lost, for which the shaft seal may be thought to be responsible. Flat seals / gaskets can be fitted properly only if the following points are observed: D Use only genuine MAN seals / gaskets D The sealing faces must be undamaged and clean D Do not use any sealing agent or adhesive − as an aid to fitting the seals a little grease can be used if necessary so that the seal will stick to the part to be fitted D Tighten bolts evenly to the specified torque

Fitting round sealing rings D Use only genuine MAN round sealing rings D The sealing faces must be undamaged and clean D Always wet round sealing rings with engine oil before fitting them

2


Contents

Page Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Engine type classification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Safety regulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fault table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . General notes on engine overhaul . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Commissioning after engine overhaul . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Engine views D 2848 LE 423 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Engine views D 2840 LE 423 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Engine views D 2842 LE 423/443 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Engine views D 2842 LE 433 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Engine lubrication schedule . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Schematic diagram of cooling system D 2842 LE 433 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Schematic diagram of cooling system D 2848/40/42 LE 423/443 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fuel diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1 2 5 6 12 15 16 18 20 22 24 26 29 28 30

Fuel system Removing and installing the high-pressure lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing and installing high-pressure pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing and installing the rail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing and installing the rail pressure sensor, pressure relief valve . . . . . . . . . . . . . . . . . . . . . . . . Removing and installing the injectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fuel prefilter with hand pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing and installing the Fuel Service Centre, replacing the filter cartridge . . . . . . . . . . . . . . . . . .

31 32 34 37 38 43 44

Cooling system Draining and filling coolant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing and installing thermostats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing and installing coolant pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Repairing coolant pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cleaning cooling system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing and installing heat exchanger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing and installing pipe cluster for heat exchanger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Checking and repairing pipe cluster for heat exchanger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cleaning heat exchanger pipe cluster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Changing impeller of sea water pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing and installing sea water pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

45 48 49 51 56 58 60 63 65 66 68

Lubrication system Changing oil filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing and installing the oil cooler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing and installing, repairing oil pump D 2848 LE 423 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing and installing, repairing oil pump D 2840/42 LE 4.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Oil injection nozzle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

69 70 72 76 81

Flywheel / Crankshaft seal Removing and fitting vibration damper, Replacing front crankshaft gasket . . . . . . . . . . . . . . . . . . . . . Removing and installing flywheel, Replacing starter gear ring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replacing crankshaft seal (flywheel end) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replacing the bearing race . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Crankshaft seals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

83 87 89 90 91

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Contents

Page Intake / exhaust system Removing and installing air filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing and installing intake pipes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing and installing exhaust pipe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Turbocharger, troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing and installing turbocharger D 2848/40/42 LE 423/443 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing and installing turbocharger D 2842 LE 433 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Measuring axial / radial clearance of turbocharger shaft . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Charge pressure control valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing and installing intercooler D 2848/40/42 LE 423/443 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing and installing intercooler D 2842 LE 433 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

92 93 94 96 98 100 103 104 105 107

Cylinder head Removing and installing cylinder head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Setting the valve clearance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dismantling and assembling the rocker arm mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing and installing valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing and installing valve guides . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replacing valve seat insert . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Reworking valve seat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Refacing valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

109 113 115 119 125 126 128 131

Valve timing Removing and installing the timing case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing and installing camshaft . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Checking the valve timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

132 134 137

Crankgear, pistons Removing and installing crankshaft . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing and installing pistons with conrods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing pistons from conrod and fitting, checking − replacing conrod . . . . . . . . . . . . . . . . . . . . . . . Removing and installing piston rings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replacing cylinder liners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Measuring piston protrusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

138 141 144 146 148 152

Attachments Removing and installing starter motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing and attaching alternator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V-belts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing and installing power take-off for sea water pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing and installing power take-off for hydraulic pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

153 154 156 160 163

Service Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

165

Special tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

200

Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

212

4


Engine type classification

All the engines dealt with here are related in terms of their design and make up a family.

The type classification, which is made up of a series of letters and numbers, reveals some of the features of the engine in question provided the reader is familiar with the underlying nomenclature.

The system is explained below using the model type D 2848 LE 423 as an example: D

The “D” at the start of the type classification stands for “Diesel”

28

The numbers “28” indicates that the power plant in question has a bore of 128 mm

4

The “4” means 142 mm stroke

8

The “8” indicates that there are 8 cylinders. If there is a “0”, this is a 10-cylinder engine

L

This letter stands for “charge-air cooling” (German: Ladeluftkühlung)

E

The “E” stands for “fitted engine” (German: Einbaumotor) and is intended to distinguish MAN vehicle engines

423

This is a factory-internal development number

5


Safety regulations

General notes This summary is a compilation of the most important regulations. These are broken down into main sections which contain the information necessary for preventing injury to persons, damage to property and pollution. Additional information can be found in the operating instructions of the engine. Important: Should an accident occur despite all precautionary measures, particularly one involving contact with corrosive acid, penetration of fuel under the skin, scalding by hot oil, antifreeze splashing into the eyes etc. you must seek medical assistance immediately.

1. Regulations designed to prevent accidents with injury to persons Checks, setting jobs and repair work must be carried out by authorised skilled personnel only. D During installation work, switch off the battery master switch.

D When carrying out maintenance and repair work, ensure that the engine cannot be accidentally started from the bridge by unauthorised persons. D The engine must be started and operated only by authorized personnel. D When the engine is running, do not get too close to the rotating parts. Wear close−fitting working clothes

D Do not touch hot engine with bare hands: Risk of burns.

D Keep area surrounding engine, ladders and stairways free of oil and grease. Accidents caused by slipping can have serious consequences D Only work with tools that are in perfect working order. Worn spanners/wrenches slip: Danger of injury. D Persons must not stand under an engine suspended on a crane hook. Keep lifting gear in order.

D Open the coolant circuit only when the engine has cooled down. If opening the coolant circuit while the engine is hot is unavoidable, observe the instructions in the chapter ”Maintenance and care” in the Operator’s Manual. D Neither tighten up nor open pipes and hoses (lube oil circuit, coolant circuit and any additional hydraulic oil circuit) during the operation. The fluids which flow out can cause injury.

6

ËË ËË


Safety regulations

D When working on the electrical system, first disconnect the earth cable of the battery and reconnect this last to prevent short circuits.

D Comply with the manufacturer’s instructions when handling batteries. Caution: Accumulator acid is toxic and caustic. Battery gases are explosive. D When performing welding work, observe the “Notes for welders”.

2. Regulations designed to prevent damage to engine and premature wear D Prior to repairing the engine, clean it thoroughly. Ensure that dirt, sand or foreign matter will not get into the engine during repair work. D If engine operation is disrupted, immediately determine the cause and have it remedied to prevent additional damage. D Always use genuine MAN parts only. Installation of ”equally” good parts from other suppliers may cause severe damage for which the workshop carrying out the work is responsible. D Never allow the engine to run dry, i.e. without lubricant or coolant. Appropriate notices must be attached to engines that are not ready for operation. D Today modern components of diesel injection consist of high−precision parts which are exposed to extreme stresses. The high−precision technology requires the utmost cleanliness during all work on the fuel system. Even a particle of dirt over 0.2 mm can lead to the failure of components. D Use only MAN−approved service products (fuel, engine oil, anti−freeze and anti−corrosion agent). Pay attention to cleanliness. Diesel fuel must be free of water. D Do not add so much engine oil that the oil level rises above the max. marking on the dipstick. Do not exceed the maximum permissible tilt of the engine. Serious damage to the engine may result if these instructions are not adhered to. D Control and monitoring devices (charge control, oil pressure, coolant temperature) must be in perfect working order. D Observe the instructions for operating the alternator; see chapter ”Maintenance and care” in the Operator’s Manual.

7


Safety regulations

3. Regulations designed to prevent pollution Engine oil and filter elements / cartridges, fuel / fuel filter D Hand old oil over to old oil disposal companies only. D Take strict precautions to ensure that no oil or Diesel fuel gets into the drains or the ground. Caution: Risk of contamination of potable water. D Filter elements are classed as dangerous waste and must be treated as such. Coolants D Treat undiluted anti−corrosion agent and / or anti−freeze as dangerous waste. D The regulations of the respective local authorities must be observed when used coolant is disposed of.

4.Notes on safety in handling used engine oil ∗ Prolonged or repeated contact between the skin and any kind of engine oil decreases the skin. Drying, irritation or inflammation of the skin may therefore occur. Used engine oil also contains dangerous substances which have caused skin cancer in animal experiments. If the basic rules of hygiene and health and safety at work are observed, health risks are not to the expected as a result of handling used engine oil. Health precautions: D Avoid prolonged or repeated skin contact with used engine oil. D Protect your skin by means of suitable agents (creams etc.) or wear protective gloves. D Clean skin which has been in contact with engine oil. − Wash thoroughly with soap and water. A nailbrush is an effective aid. − Certain products make it easier to clean your hands. − Do not use petrol, Diesel fuel, gas oil, thinners or solvents as washing agents. D After washing apply a fatty skin cream to the skin. D Change oil-soaked clothing and shoes. D Do not put oily rags into your pockets. Ensure that used engine oil is disposed of in the appropriate manner. − Engine oil can endanger the water supply − For this reason do not let engine oil get into the ground, waterways, the drains or the sewers. Violations are punishable. Collect and dispose of used engine oil carefully. For information on collection points please contact the seller, the supplier or the local authorities. ∗ Based on “Information sheet for handling used engine oil”.

8


Safety regulations

5. Special instructions when working on the common rail system Accident protection D Risk of injury! Fuel jets can cut through skin. The atomisation of fuel creates a fire risk.

− When the engine is running never loosen the screw connections on the fuel’s highpressure side of the common rail system (injection line from the high-pressure pump to the rail, on the rail and on the cylinder head to the injector) − Keep away from the engine when it is running D Risk of injury! When the engine is running the lines are constantly under a fuel pressure of up to 1600 bar.

− Wait at least a minute until the pressure in the rail has dropped before loosening a screw connection − If necessary check the pressure drop in the rail with MAN-Cats D Risk of injury! − People with pacemaker must keep at least 20 cm away from the running engine

− Do not touch live parts on the electric connection of the injectors when the engine is running

9


Safety regulations

Cleanliness Today modern components of diesel injection consist of high-precision parts which are exposed to extreme stresses. The high-precision technology requires the utmost cleanliness during all work on the fuel system. Even a particle of dirt over 0.2 mm can lead to the failure of components. The measures described as follows are therefore essential before work begins: Risk of damage from penetration of dirt! D Before working on the clean side of the fuel system clean the engine and the engine compartment (high-pressure cleaner). During cleaning the fuel system must be closed

D Carry out visual inspection for any leakage or damage to the fuel system D Do not spray the high-pressure cleaner direct onto the electric components, or alternatively keep them covered D Do not carry out any welding or sanding work in the engine compartment during maintenance / repair D Avoid air movements (any swirling of dust when starting engines) D The area of the still closed fuel system must be cleaned and dried with the aid of compressed air D Remove detached particles of dirt such as paint chippings and insulation material with a suitable extractor (industrial type vacuum cleaner) D Cover areas of the engine compartment from which dust particles could be detached with clean foil D Wash your hands and put on clean work clothes before starting the disassembly work D Clean tools and working materials before starting to work

10


Safety regulations

When carrying out the work it is essential to comply with the following measures: Risk of damage from penetration of dirt! D When the clean side of the fuel system has been opened it is not permissible to use compressed air for cleaning D During assembly work loose dirt must be removed with the aid of suitable extractors (industrial type vacuum cleaners) D Use only fluff-free cleaning cloths on the fuel system D Only tools without any damage may be used (cracked chrome coatings) D When removing and installing components do not use materials such as cloths, cardboard or wood since these could shed particles and fine fibres D If any paint chips / flakes off when connections are loosened (from possible over-coating) these chippings must be carefully removed before finally loosening the screw connection D The connection openings of all removed parts on the clean side of the fuel system are to be closed immediately with suitable caps (see special tools, page 208) D These caps / stoppers must be packed protected from dust prior to use and after being used once they must be disposed of D Following this all the components must be carefully stored in a clean, closed container D Never use used cleaning or testing liquids for these components D New parts must not be removed from their original packing material until directly before use D Work on removed components may be carried out only at a workplace specially equipped for it D If removed parts are shipped always use the original packing material of the new part

11


Fault table

Operating faults and possible causes

We recommend A repair is only complete when both the damage that occurred and the possible causes have been eliminated. Finding out the cause of damage is often more difficult than repairing the damage that occurred. We therefore recommend that you obtain a precise description of the operating fault before “removing and dismantling” components. Then use a process of elimination (questions) to pinpoint the probable causes and investigate and eliminate these successively on the basis of the table and your own experience. This helps to reduce repairs to the required scale and to counteract claims regarding “over-eager” replacement of parts and complaints about expensive work and down time.

Note: The following list is conceived as an aid to memory for experts so that to causes of damage are overlooked when dealing with faults. The precondition for this, however, is that the experts are familiar with the Repair Manual for the engine as well as the accompanying Operating Instructions and the publication “Fuels, Lubricants and Coolants for MAN Diesel Engines”.

12


Fault table

1. 2.

EDC self-diagnosis or flash code output Starter motor turns over engine slowly or not at all 3. Starter motor turns, engine fails to start, engine fails to start / difficult to start when cold 4. Engine stalls (dies) during operation, no longer starts (starter motor turns), engine fails to start / difficult to start when hot 5. 6.

x x x x x

Sudden, temporary engine shutdown, engine does not reach full revs Engine runs at idle speed only, no throttle response 7. Engine runs at increased idle speed only, no throttle response 8. Rated engine speed significantly reduced (even at no load) 9. Reduced power output in all ranges 10. Irregular engine operation, loss of traction 11. Unstable idle speed, engine surges, misfiring, engine knocking 12. Engine judder 13. Unusual combustion noises 14. Excessive smoke emission: white smoke / blue smoke 15. Excessive smoke emission: black smoke 16. Engine temperature too high (coolant loss) 17. Fuel consumption too high 18. Lubrication oil pressure too low 19. Lube oil pressure too high 20. Lube oil consumption too high 21. Engine too “loud” / mechanical noises 22. Idle speed cannot be adjusted with idle speed operating unit Possible causes Battery flat, battery lead connections loose or corroded, break in power circuit Crankshaft drive blocked Starter solenoid switch sticks (clicks) / damaged, cable connection loose or damaged

x x

Starter motor / starter interlock relay defective (carbon brushes worked loose / worn, winding damaged, short to ground)

x

x x x

Engine oil viscosity unsuitable, not suitable for ambient temperature, lube oil quality does not comply with specifications

x

Oil level in oil pan too high Oil level in pan too low, oil in oil pan too thin (mixed with condensate or fuel) Engine temperature too high Oil filter clogged Oil pressure gauge defective Safety valve in the oil circuit defective (does not close, spring fatigued or broken) Heavy bearing wear Oil pump gears heavily worn Timing gears worn, tooth flank backlash too great Engine cold Lube oil entering combustion chamber (piston rings worn, piston rings broken) − valve stem guide worn − overpressure in crankcase (crankcase breather clogged) Safety valve in oil circuit defective (does not open), oil lines / oil galleries clogged Leaks in lube oil circuit, particularly at turbocharger and oil cooler Piston rings heavily worn, broken Piston pins or crankshaft bearings loose Valve stems heavily worn, bent Valve clearance not correct Valves jammed Compression deficient, or more than 3−4 bar pressure difference between individual cylinders

x x x x x x x x x

x x

x

x x

x

x x x

x x

x x

x x x x

x

x o

x

x

x x

x x

x = o =

x x x

x

x x x x

x x

x x x

x x x

x x

x

x

x

x

x

Valve seats leaking Increased power input due to defective secondary loads / consumers such as hydraulic pumps, fan etc., power take-off engaged x

Air filter fouled or clogged, charge air system leaking, air intake / exhaust lines clogged / leaking Fuel low pressure system: fuel tank, prefilter, water trap faulty / clogged / mould / fungal attack, fuel unsuitable / contaminated (paraffin added) Fuel low pressure system: fuel lines leaking, broken, clogged

Probable Possible

13


Fault table

1. 2.

EDC self-diagnosis or flash code output Starter motor turns over engine slowly or not at all 3. Starter motor turns, engine fails to start, engine fails to start / difficult to start when cold 4. Engine stalls (dies) during operation, no longer starts (starter motor turns), engine fails to start / difficult to start when hot 5.

Sudden, temporary engine shutdown, engine does not reach full revs Engine runs at idle speed only, no throttle response 7. Engine runs at increased idle speed only, no throttle response 8. Rated engine speed significantly reduced (even at no load) 9. Reduced power output in all ranges 10. Irregular engine operation, loss of traction 11. Unstable idle speed, engine surges, misfiring, engine knocking 12. Engine judder 13. Unusual combustion noises 14. Excessive smoke emission: white smoke / blue smoke 15. Excessive smoke emission: black smoke 16. Engine temperature too high (coolant loss) 17. Fuel consumption too high 18. Lubrication oil pressure too low 19. Lube oil pressure too high 20. Lube oil consumption too high 21. Engine too “loud� / mechanical noises 22. Idle speed cannot be adjusted with idle speed operating unit Possible causes x x x x x x x Fuel low pressure system: air in system (turn on ignition when bleeding system) x x x x x x x x x Fuel low pressure system: feed pump, main filter x x x x x o x x Fuel high pressure system: injectors defective / clogged / leaking / coked x x x x o Fuel high pressure system: pressure lines − constriction, cavitation, leaking x x o x x x x o Fuel high pressure system: high-pressure pump worn x x x x o Pedal value sensor (driving lever signal) defective: connection lines, short circuit, interruption 6.

x x x x

x x

x o o o

x x x o

EDC rpm sensor defective, lead defective EDC rpm sensor, polarity reversed EDC detects incorrect engine speed (interference signal on rpm sensor lead) EDC boost pressure sensor: faulty, incorrect, implausible with atmospheric pressure sensor, line fault

o

x

x

x

x

o x x x

x x o

o

x x x x x

o

x x x x x x x

x x x

x x o o o o x

o x x x

o o

o x

x x

x x

x = o =

x

Exhaust turbocharger leaking or defective Turbine and compressor wheel in the turbocharger soiled (running off balance) Intercooler leaking, defective EDC coolant temperature sensor: faulty, line fault EDC charge-air temperature sensor: faulty, line fault Radiator fouled or failure of cooling system (temperatures too high) Coolant level too low, air in the coolant circuit V-belt for coolant pump drive not tensioned correctly Incorrect V-belt tension Coolant pump leaking, defective / thermostat defective, does not open Coolant lines leaking, blocked or twisted Coolant entering combustion chamber (cylinder head / gasket leaking) Power supply to EDC control unit interrupted or battery voltage too low EDC control unit defective (internal fault) Incorrect EDC control unit (check MAN part number) Afterrunning not completed Thermostat defective Engine bearings worn

Probable Possible

14


General notes on engine overhaul

The service life of an engine is influenced by very different factors. It is therefore not possible to specify certain fixed numbers of operating hours for general overhauls. In our view, it is not necessary to open up and engine or perform a general overhaul as long as the engine has good compression values and the following operating values have not changed significantly in relation to the values measured on commissioning the engine: D Charging pressure D Exhaust temperature D Coolant and lubricant temperature D Oil pressure and oil consumption D Smoke emissions The following criteria greatly influence the length of the engine service life: D Correct power output setting according to the type of application D Technically correct installation D Inspection if installation by authorised personnel D Regular maintenance as per maintenance plan D Choice and quality of lube oil, fuel and coolant in accordance with the publication “Fuels, Lubricants and Coolants for MAN Diesel Engines�

15


Commissioning after engine overhaul

Pressurisation It is extremely important for internal combustion engines (following the completion of repair work, i.e. in their dry state) to be pressurised with lube oil before being recommissioned. This procedure can also be used for ascertaining damage and its causes. If engines are not pressurised, the risk of premature damage to bearing surfaces is very high because it takes a relatively long period of time for the lube oil drawn in from the oil pan via the oil pump to reach the individual bearings. Such incipient damage need not necessarily lead to immediate bearing failure, but may impair the proper functioning of the bearings and reduce their service lives.

Diagram of the oil flow with unpressurised engines

16


Commissioning after engine overhaul

Pressurising an engine affords the following advantages: D All engine parts are lubricated before engine startup; a lubricating film can be built up inside the bearings as early as after the first few rotations of the crankshaft, thereby preventing damage to the bearing races D Any loss of oil, be it the result of excessively large bearing play or leaks from the crankcase or from crankcase bores which may not be plugged, can be detected immediately. For this purpose, mount the engine on an assembly dolly, remove the oil pan and install a suitable oil collector under the crankcase in such a way that the bearings are visible

Performance of pressurisation: At least 30% of the total oil quantity is forced from the pressurisation container into the engine oil circuit. The operating pressure serves as the yardstick for the pressure to be forced in and must not be exceeded. The pressurisation container is connected up to the engine oil circuit at the oil filter (screw plug).

17


Engine views

Engine views D 2848 LE 423 1

2

3

4

5 13

6 7 5 9 1

12 11 14

10 15

9

8

16 17

20 19

18

14

18


Engine views

À Airfilter Á Relief valve on coolant surge tank  Intercooler à Heat exchanger and coolant surge tank Ä Tensioning pulley Å Alternator Æ Engine cranking device Ç Coolant filler neck È Oil drain plugs É Coolant pump 11

Oil sump

12

Oil cooler

13

Oil filter

14

Turbocharger

15

Exhaust manifold

16

Fuel Service Center

17

Crankcase breather

18

Oil filler neck

19

Sea water pump

20

Fuse box

19


Engine views

Engine views D 2840 LE 423 1

2

3

4

5 6

13

7 12

11

8

10

14

9 15

16

17

15

12

19 18

20


Engine views

À Airfilter Á Relief valve on coolant surge tank  Intercooler à Heat exchanger and coolant surge tank Ä Alternator Å Engine cranking device Æ Tensioning pulley Ç Coolant filler neck È Coolant pump É Oil sump 11

Oil cooler

12

Oil drain plugs

13

Oil filter

14

Exhaust manifold

15

Turbocharger

16

Fuel Service Center

17

Crankcase breather

18

Sea water pump

19

Fuse box

21


Engine views

Engine views D 2842 LE 423/443 1

2

3

4

5 6 7

13

5

12

11

14

10

9

15

8

16

17

18

22


Engine views

À Airfilter Á Intercooler  Relief valve on coolant surge tank à Heat exchanger and coolant surge tank Ä Tensioning pulley Å Alternator Æ Engine cranking device Ç Coolant pump È Coolant filler neck É Oil pan 11

Oil cooler

12

Oil drain plugs

13

Oil filter

14

Oil filler neckTurbocharger

15

Crankcase breather valve

16

Turbocharger

17

Sea water pump

18

Fuse box

23


Engine views

Engine views D 2842 LE 433 2

1

3

4

14

13 5 6

12

7 5 9 9

11

15

8

10

16

17

18

20

19

24


Engine views

À Intercooler stage 1 Á Intercooler stage 2  Relief valve on coolant surge tank à Heat exchanger and coolant surge tank Ä Tensioning pulley Å Alternator Æ Engine cranking device Ç Coolant filler neck È Oil drain plugs É Oil pan 11

Oil cooler

12

Oil filter

13

Fuel Service Center

14

Turbocharger

15

Oil dipstick

16

Exhaust manifold

17

Air filterSea water pump

18

Fuel pump

19

Sea water pump

20

Fuse box

25


Engine lubrication schedule

1

2

3

4

5

5

9

8

7

7

6

À Oil line to crankshaft

Å Oil pump with oil pressure relief valves

Á High-pressure pump lubrication

Æ Holes for conrod bearing lubrication

 Lubricating oil lines to exhaust turbochargers

Ç Oil drain screw

à Oil return line from exhaust turbochargers

È Oil intake pipe

Ä Holes for main bearing lubrication

26


Engine lubrication schedule

2

1

1

11

3 10 4 5

9

8

6

7

À Lubricating oil lines to exhaust turbochargers

Å Oil intake pipe

Á Rocker arm lubrication

Æ Oil pressure relief valves

 Piston pin lubrication

Ç Oil cooler

à Spray nozzles for piston cooling and cam lubrication

È Bypass valve É Oil filter

Ä Camshaft bearing lubrication

11

27

Main oil galleries


Schematic diagram of cooling system D 2842 LE 433

1

2

3

4

19

5

6

18

17

7

16

8

15

9

10 11

14 13 12

À Sea water inlet

11

Coolant filler neck

Á Sea water pump

12

Heat exchanger, engine coolant / sea water

 Exhaust turbocharger, liquid-cooled

13

Sea water outlet

à Exhaust manifold, liquid-cooled

14

Thermostat

Ä Exhaust pipe, liquid-cooled

15

Heater feed and return system

Å Intercooler

16

Coolant pump

Æ Coolant temperature measuring point

17

Crankcase

Ç Coolant line with throttle

18

Engine oil cooler

È Expansion tank

19

Gearbox oil cooler

É Positive pressure / negative pressure valve

28


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Man marine diesel engine v12 1550 (d 2842 le 433) service repair manual  
Man marine diesel engine v12 1550 (d 2842 le 433) service repair manual  
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