3.13.4.2 Fitting the high-pressure pump
Procedure
1.
Attach new O-rings to the sealing grooves of the high-pressure pump and the guide ring. If the front
cover of the gear housing has not been removed, fix the gear to the shaft of the pump. Please note
that the guide ring of the high-pressure pump has to be fixed to the pump flange before the gear is
fixed.
2.
Tighten the nut of the high-pressure pump gear to 80 Nm.
3.
Lubricate the O-rings, place the high-
pressure pump in position in the gear
housing. Make sure that the pump gear mark
is aligned with the idler gear mark and
tighten the fixing screws to 25 + 5 Nm.
4.
Fix the fuel feeding pipes. Tighten the
connectors of the low-pressure pipes and the
connectors of the high-pressure pipes to 30
Nm. Then attach the wiring connector.
Fig. 110
Fig. 111
3.13.5 Rail
WARNING:
Do not make any work at the common rail high pressure fuel system when the engine is
running. Wait at least 30 seconds after stopping the engine .The first high pressure
component has to be loosened slowly, so that the pressure inside the fuel system can
adjust to ambient pressure. If the jet of high pressure fuel contacts your skin, fuel
penetrates the skin causing severe injuries. Get medical help immediately!
3. Maintenance
3-66 4th Generation Engines
8370 79492
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