Pump coupling shaft, removing. Volvo Penta TWD1620GH, TWD1630P, TAD1630G, TAD1631G, TAD1630GE, TWD1630G, TAD1631GE, TAD1630P, TAD1630V, TWD1630V

Group 22 Service procedures - fuel system

Pump coupling shaft, removing Injectors

Checking and replacing the laminates on the pump coupling

Check that the laminates on the pump coupling for the injection pump are not cracked or warped.

Start the engine and let it idle (at about 500 rpm). Check visually 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)

The injectors are placed vertically in the middle of the cylinder 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 injectors’ 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

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