Pump removal, dismantling and examination

Pump removal, dismantling and examination

The pump is located on the carburetter side of the engine crankcase (sedan) or under the generator at the front of the crankcase (station wagon).

Removal

1. Disconnect the fuel pipe from the tank to stop petrol syphoning out of the tank and then release the fuel inlet and outlet pipes from the pump body.
2. Remove the two nuts and washers holding pump to crankcase.
3. Carefully lift away the pump, gaskets and insulating pad from the crankcase (see FIG 2:3).

Dismantling

1. Refer to FIG 2:2 and remove the cover mounting screw 1 and washer 2. Lift off cover 4 and filter 13. Mark the relative position of the two halves of the pump body. Remove the pump bodies interlocking screws 19 and separate the upper half from the lower half of the body.
2. Push down the centre of the diaphragm assembly 14 and rotate through 90 deg. to release diaphragm from the rocker 21. Lift out diaphragm and spring 15.
3. Release the two valve assemblies in the upper body by removing the valve retaining plate locking screws 11, and lifting out the plate 12, gasket 10, valve springs 6 and 9, and valves 7 and 8.
4. Using a pin punch remove the rocker pivot pin together with the two washers and carefully lift away rocker and reaction spring.
5. Thoroughly wash all components in petrol and blow dry with compressed air or a foot pump. Inspect the valves 7 and 8 for evidence of damage and valve springs 6 and 9 for weakness or cracks. Check to see that the diaphragm reaction spring and rocker are not distorted or unserviceable. Generally inspect all parts for cracks, distortion and the diaphragm for stiffness and also the rocker and pin for wear.