ROBERT BOSCH MODEL MW INJECTION PUMP
REPLACING HAND PRIMING PUMP
The hand priming pump is threaded into the supply pump
housing (Figure 30). After removing old priming pump,
place Loctite hydraulic sealant on pump threads and
install new pump with new copper washer.
ALWAYS TIGHTED HAND PRIMING PUMP HANDLE
AFTER USE. THE PUMP WILL LEAK AND BE
DAMAGED IF HANDLE IS LOOSE DURING ENGINE
Figure 30. - Hand Priming Pump
REPLACING FUEL SUPPLY PUMP
Three washers, lock washers and nuts retain the supply
pump to pump housing (Figure 31). Remove these
parts, fuel inlet and oil outlet fittings and hand priming
pump to remove old pump. Install new supply pump
housing mounting gasket when installing new pump.
The supply pump will be easier to install if engine is
rotated so injection pump camshaft eccentric is in lowest
Figure 31. - Replacing Fuel Supply Pump
REPLACING LUBRICATING OIL FITTINGS
Lubricating oil enters the pump from an external oil line
which originates at a crankcase fitting just above the fuel
filters. The oil line connects to a brass elbow and the
elbow to the injection pump inlet connector (Figure 32).
If tightening these fittings does not stop oil leakage,
replace oil line grommet, brass elbow or inlet connector
and copper washers as necessary.
Figure 32. - Lubricating Oil Fittings
PRINTED IN UNITED STATES OF AMERICA