Mitsubishi 6d16 3at3 service Manual

GROUP 15 INTAKE AND EXHAUST

SPECIFICATIONS................................................................................... 15-2 STRUCTURE AND OPERATION ........................................................... 15-2 TROUBLESHOOTING ............................................................................ 15-5 ON-VEHICLE INSPECTION AND ADJUSTMENT • Measurement of Turbo Boost Pressure ................................................. 15-6

AIR DUCT................................................................................................ 15-8 AIR CLEANER ........................................................................................ 15-10 TURBOCHARGER.................................................................................. 15-12 INTERCOOLER....................................................................................... 15-24 INTAKE MANIFOLD ............................................................................... 15-26 EXHAUST MANIFOLD............................................................................ 15-28 EXHAUST PIPE AND MUFFLER ........................................................... 15-30

15-1

SPECIFICATIONS/STRUCTURE AND OPERATION SPECIFICATIONS Items

Specifications

Air cleaner element Turbocharger

Cyclone paper filter type Model

TD07

Manufacturer

MITSUBISHI HEAVY INDUSTRIES

Intercooler type

Air-cooled, tube and corrugated fin type

STRUCTURE AND OPERATION Air Cleaner 1 Air lower duct 2 Air cleaner assembly 3 Evacuator valve • Air cleaner assembly 2 uses a double element.

• Evacuator valves 3 are fitted with air lower duct 1 and air cleaner assembly 2.

• Evacuator valves 3 automatically vent dust and dirt by the repercussive force of the rubber of the valve that overcomes the inner negative pressure when the engine revolution falls below the specified revolution.

13666

Turbocharger 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

13522

15-2

Compressor cover Compressor wheel Piston ring Thrust sleeve Insert Thrust bearing Thrust ring Bearing housing Turbine backplate Turbine housing Shaft and turbine wheel Piston ring Bearing Oil deflector Actuator

15 Waste gate mechanism • The waste gate mechanism relieves the boost pressure of excess exhaust gas using actuator 15. This controls the boost pressure appropriately and prevents the turbocharger from overrunning, and prevents excessive pressure in the intake manifold.

• The boost pressure is fed into chamber A of actuator 15 from compressor cover 1 via a rubber hose. When boost pressure C, acting on chamber A, is lower than the preset value, the actuator does not operate and waste gate valve B remains closed, therefore exhaust gas D is blown against shaft and turbine wheel 11.

01510

• As the boost pressure acting on chamber A increases to become higher than the preset value, waste gate valve B is opened and the exhaust gas blown against shaft and turbine wheel 11 decreases.

Therefore the rotation of compressor wheel 2 decreases, causing the boost pressure to decrease.

06538

Operation of over-boost valve • Over-boost valve E operates when the boost pressure increases abnormally because of faulty operation of the waste gate mechanism.

01512

• If boost pressure C of over-boost valve E increases to become higher than the preset value, the excessive boost pressure is discharged into the atmosphere, protecting the engine from excessive boost pressure. When the valve is operating, a pipe-blowing sound is generated.

01513

15-3

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