a. Removal.
(1) Disconnect oil tank feed pipe at oil tank. Install nipple cap on tank nipple to prevent oil from running out, or drain tank. Disconnect oil feed pipe from oil pump nipple.
(2) Oil pump is secured to engine gear case cover by one hexagon head bolt and three nuts. Two of the nuts are extra long to provide wrench clearance, and their location should be noted so they will be put back where they belong when reinstalling pump. After removing screw and nuts, remove pump. Unless a new pump gasket is available, take care not to damage or break the old one, as this is a very special gasket concerning both thickness and holes provided for oil channels. A “homemade” gasket may put oiling system completely out of commission.
b. Installing Oil Pump.
(1) Clean surface of pump body mounting on gear case cover and see that gasket is in good condition. Clean face of oil pump body.
(2) Start pump on mounting studs, turn engine slowly and press lightly against pump until driving dogs on end of cam gear shaft line up with and drop into driving slot in oil pump rotor.
(3) Insert hexagon‐head bolt and lock washer, and install the three lock washers and nuts (two are long extension nuts) on pump mounting studs. Make sure to replace the two extra long nuts on the studs from which they were originally removed.
(4) Tighten mounting bolt and three nuts securely.
(5) Connect oil feed pipe to oil pump nipple. Remove nipple cap from tank nipple and connect upper end of oil feed pipe to this nipple. Tighten nipple nuts securely.