Fan Motor Fuel-Powered Preheater

Fan motor fuel-powered preheater

Note! The illustrations in this service information are used for different model years and/or models. Some variation may occur. However, the essential information in the illustrations is always correct.

Preparatory work

Removing components

Remove:
- the engine coolant heater. See: Fuel Fired Booster Heater, B5254T7, L.H.D Fuel Fired Booster Heater
- the combustion preheater module (CPM). See: Fuel Fired Booster Heater Control Unit, B5254T7, L.H.D Fuel Fired Booster Heater Control Unit.

Removal

Removing the fan motor for the engine coolant heater




Remove the 4 screws for the cover over the fan housing. Remove the cover.

Note! The nearest connection pipe may need to be adjusted in order to remove the cover. See: Coolant pipe fuel-powered preheater, B5254T7, L.H.D Coolant Pipe Fuel-Powered Preheater.




Carefully pull the fan housing straight out, viewed from the shorter side of the engine coolant heater. See the illustration.




Disconnect the cable terminals and wiring for the fan motor at positions 13 and 14 (black and brown).




Remove the 3 screws.
Lift the fan motor away from the heat exchanger.

Transferring components

Transferring the glow plug, pressure equalizer and flame trap

Transfer:
- the glow plug and pressure equalizer. See: Glow plug fuel-powered preheater, B5254T7, L.H.D Glow Plug Fuel-Powered Preheater
- the flame trap. See: Flame sensor fuel-powered preheater, B5254T7, L.H.D Flame Sensor Fuel-Powered Preheater.

Installation

Installing the fan motor for the engine coolant heater




Replace both gaskets supplied with the fan motor.

Install:
- the gasket (1) between the heat exchanger housing and the combustion chamber
- the combustion chamber (2)
- the molded gasket (3). Ensure that the hole for the glow plug is above the hole in the combustion chamber
- the fan motor. Ensure that the molded gasket is positioned correctly in the recess.

Note! The molded gasket (3) has a small tab that must fit in the corresponding mating faces on the heat exchanger housing and the fan.

Tighten the 3 screws on the fan motor.

Install:
- the cable terminals and wiring for the fan motor in positions 13 and 14 (black and brown) in the 14-pin connector
- the fan motor housing
- the cover over the fan motor using 4 screws.




If necessary adjust the pipe coupling. See: Coolant pipe fuel-powered preheater, B5254T7, L.H.D Coolant Pipe Fuel-Powered Preheater.

Install:
- the control module. See: Fuel Fired Booster Heater Control Unit, B5254T7, L.H.D Fuel Fired Booster Heater Control Unit
- the auxiliary heater acc. to: Fuel Fired Booster Heater, B5254T7, L.H.D Fuel Fired Booster Heater.

Finishing

Testing the engine coolant heater
Carry out a performance test of the engine coolant heater. See: Fuel-powered preheater, checking Fuel-Powered Preheater, Checking.