Removing And Installing Oil Pump With Engine Installed In Chassis

(To Identify Items, Refer to Illus. 56)

Removing Oil Pump

1. Remove stop lamp switch and oil pressure switch. Remove oil return pipe. Remove oil feed pipe and install nipple cap. Part No. 358315 on oil tank feed pipe nipple to prevent oil from running out, or drain tank.

2. 1940 Model pump is secured to crankcase by six nuts—after removing the six nuts, remove pump cover and gasket; 1941 and later Model pump is secured by one cap screw, one flat head screw and five nuts, one of the nuts is extra long to provide wrench clearance and its location should be noted, so it will be put back on same stud when reinstalling pump—after removing nuts and screws, remove pump cover (29), governor rotor (28), cover plate (26) and gaskets (25) and (27).

All O.H.V. Models: Unless new gaskets are available, be very careful not to damage or break the old ones. These are special gaskets as concerns both thickness and holes for oil passages. It is not advisable to attempt to replace them with "home-made" gaskets. Leaving out a hole or getting one in the wrong location is enough to put the entire oiling system out of commission. When new gaskets are needed, they should be replaced with "factory-made" gaskets.

3. Place a small piece of rag or paper in feed oil hole in bottom of pump body to prevent gear key dropping into hole should it fall out of drive shaft when removing scavenger pump gear (23). Remove lock ring (24) from groove in outer end of shaft and slide gear off shaft. Remove key (21) from drive shaft. Pump body can now be pulled off studs.

Remove feed pump idler gear (5) if it did not come off with pump body.

Slide feed pump gear (6) off shaft and remove key from shaft—occasionally gear will come off with pump body, in which case be careful key is not lost. After gear and key have been removed from shaft, be sure shaft is pulled outward to its limit. If shaft is pushed inward ap-proixmately Ye", key in end of shaft inside gear case may drop out and gear case cover would then have to be removed to install key. See "Servicing Oil Pump (O.H.V. Engine)," Pages 71 and 72.

Installing Oil Pump

1. Be sure all moving parts of oil pump are thoroughly oiled. Clean surface of pump body mounting on crankcase. See that pump body gasket is in good condition, and install it over pump mounting studs. Clean face of oil pump body.

2. Install smaller of the two keys in drive shaft keyway (nearest crankcase) and install feed pump gear (6) so keyway registers with key. Install feed pump idler gear (5) with hub of gear registering in hole counterbored in crankcase.

3. Install pump body making sure the small piece of rag or paper put in oil feed hole in bottom of pump body when removing pump, is still in place to prevent possibility of key dropping into hole should it fall out of shaft when installing scavenger pump gear. Make sure feed pump gear (6) is snug against cra^ikcase when installing pump body, to prevent possibility of key dropping out of shaft.

1941 and later Model Pump: Install flat head screw that secures pump body to crankcase.

4. All O.H.V. Model Pumps: Install larger of the two keys in drive shaft keyway (near outer end) and install scavenger pump gear (23) so keyway registers with key. Install new lock ring in groove at outer end of shaft to retain gear. Install scavenger pump idler gear (22).


1940 Model Pump: Install cover gasket, cover, nuts and washers. 1941 and later Model Pump: Install gasket, cover plate, gasket, governor rotor, cover, nuts, cap screw and washers. Make sure driving tongue on rotor (28) registers in slot in scavenger pump idler gear (22).

5. Tighten cap screw and/or nuts securely.

6. Install oil return pipe (connecting lower end of pipe to pump upper nipple). Install oil feed pipe (connecting lower end of pipe to pump lower nipple) and tighten nipple nuts securely.

7. Install oil pressure switch and stop lamp switch.

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