Cooling system - Service Procedures

Coolant distributor pipe, changing

Only 12 ltr engines

Removing

1

Fitting

8

Fit new gaskets on the cylinder heads.

9

Drain off the coolant.

2

Remove the four front fuel delivery pipes and fit protective plugs on the injectors and the injection pump connections.

NOTE! Fuel delivery pipes must never be bent or altered. A damaged fuel delivery pipe should always be replaced with a new one.

Fit the coolant distributor pipe and fit and tighten the bolts.

Disconnect the fuel delivery pipe bracket from the coolant distributor pipe.

Disconnect the pipes and remove the fuel filter housing.

10

Remove the clamp between the coolant distributor pipe and thermostat housing. 6

Remove the coolant distributor pipe bolts and lift out the pipe. 7

Remove the gaskets and clean the contact surfaces of the cylinder heads and coolant distributor pipe.

Tighten the clamp between the coolant distributor pipe and thermostat housing. 11

Fit the fuel filter housing and connect the pipes. Use new copper washers. 12

Fit the fuel delivery pipes and screw the bracket to the coolant distributor pipe.

NOTE! Fuel delivery pipes must never be bent or altered. A damaged fuel delivery pipe should always be replaced with a new one.

Fill with coolant.

Bleed the fuel system.

14

Start the engine and check for leakage.

Thermostatically controlled cooling fan, function check

Special tool: 9988460

Fan malfunction can be due to, among other things, an incorrect amount of silicone fluid or worn parts in the control device.

Before carrying out a function check, make sure that the radiator is not clogged and that the coolant temperature sensor is working.

If the thermostat in the cooling system is not functioning, this may disturb the function of the fan. Note that fitting of so-called radiator blinds can mean that the termostatically controlled fan will operate continuously.

The fan can be presumed to not be working properly should any of the following be observed:

1.The fan does not engage, i.e. low fan speed is maintained despite high engine load. This will imply a high coolant temperature.

2.The fan does not disengage, despite low engine load.

Control device

1Bimetallic spring

2Control pin

3Valve lever

B. The fan is fully engaged: The bimetallic spring flexes outwards due to the temperature increase in the ambient air.

Control device

A. The fan rotates at reduced speed: The bimetallic spring (1) presses against the control pin (2) moving it towards the valve lever (3).