Oil Pump
Two bolts hold on oil pump cover and three studs hold pump to crankcase. To remove pump, remove stud nuts and remove pump and drive shaft. To disassemble, proceed as follows:
- Remove cover, located at base of oil pump by two dowels. Remove outer rotor complete with oil pump shaft. Clean all parts in kerosene and inspect for wear.
- Rotor end play should be checked as follows: Install rotors in pump body and place straightedge across joint face of pump body. Measure clearance between top face of rotors and underside of straightedge. Clearance should not exceed 0.005". If clearance is excessive, remove two cover locating dowels and lap the joint face of pump body.
- Check clearance between outer rotor and rotor pocket in pump body. If clearance exceeds 0.010", pump rotor, pump body, or complete pump assembly should be replaced.
- Measure clearance of rotor lobes with rotors installed in pump body (see Fig 1). If clearance exceeds 0.006", rotors must be replaced.
- Reassemble pump and lubricate all parts with clean engine oil. Make sure outer rotor is installed in pump body with chamfered end at drive end of rotor pocket in pump body.