Group 22 Service procedures - fuel system
101
Pump coupling shaft, removing Injectors
The injectors are placed vertically in the middle of the cylin-
der through the valve cover.
The injectors’ task is to:
– Diffuse the fuel to ensure firing and combustion.
– Together with the air turbulence, distribute the spray of
fuel in the combustion chamber so that a mixture of air
and fuel is provided.
The tension of the compressed springs determines the injec-
tors’ opening pressure.
1. Diffuser holder
2. Hollow screw
3. Gasket
4. Adjusting washer
5. Spring
6. Pressure pin
7. Guide pin
8. Guide
9. Guide pin
10. Diffuser
11. Diffuser nut
Checking and replacing the laminates on the pump cou-
pling
Check that the laminates on the pump coupling for the injec-
tion pump are not cracked or warped.
Start the engine and let it idle (at about 500 rpm). Check vis-
ually that the plates are not warped.
If the laminates have broken or are warped they must both
be replaced.
Max axial play on the pump’s drive shaft, from transmission
to the pump coupling should not exceed 0.1 mm (0.0039").
Note: Laminate plates should only be fitted when dry. All
screws shall be torque tightened.
Clamping screw: 85 Nm (62.7 ft-lb)
Other screws (8 ea): 56 Nm (41.3 ft-lb)
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