Coolant Pipe Fuel-Powered Preheater
Coolant pipe 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
Replacing pipe couplings
Remove:
- the engine coolant heater. See: Fuel Fired Booster Heater, B5254T7, L.H.D Fuel Fired Booster Heater
- the engine coolant hose(s) from the pipe coupling(s) on the engine coolant heater.
Hint: Mark out the internal location of the engine coolant hoses and the angle of the pipe couplings in relation to the cover.
Removal
Removing the cover over the heat exchanger
Remove cover over heat exchanger. It is secured using 4 screws.
Lift up the cover a little until the snap rings for the pipe couplings release.
Ease out and pull the pipe couplings upwards, one at a time.
Removing pipe coupling and snap ring
There are snap rings on the underneath of the cover that also hold the pipe couplings in place. The snap rings are located in a groove on the pipe coupling.
Using a small screwdriver, pry up 1 of the 2 grooves on each snap ring. Remove the snap ring.
Remove the pipe.
Installation
Installing the pipe coupling and cover
Install the pipe.
Clamp the snap ring by compressing the groove. See the illustration.
Press in the pipes. Adjust the pipes so that they are positioned according to previous markings.
Press down the cover fully. Install the 4 screws. Tighten.
Hint: Lubricate the O-rings for the pipes so that they can be inserted more easily into the openings in the heater exchanger.
Install:
- the engine coolant hose(s) on the pipe coupling(s) on the engine coolant heater so that they are positioned according to the previous markings
- the engine coolant heater. See: Fuel Fired Booster Heater, B5254T7, L.H.D Fuel Fired Booster Heater
Finishing
Testing the engine coolant heater
Perform a performance test of the engine's preheater. See: Fuel-powered preheater, checking Fuel-Powered Preheater, Checking