Section 3.2- engine oil pump, Oil pump disassembly, Oil pump inspection – Generac 86640 User Manual
Page 50
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Section 3.2- ENGINE OIL PUMP
Oil Pump Disassembly
When removing the oil pump, be careful not to drop the
oil pump drive shaft. When installing the pump, apply engine
oil to the drive gear and shaft. The inner rotor and shaft cannot
be disassembled.
Oil Pump Inspection
Visually inspect oil pump parts for wear and damage.
Inspect the oil pressure regulator valve sliding surfaces and
valve spring. Replace the valve seat, if damaged. Use a feeler
gauge to check (a) rotor tip clearance, (b) outer body to body
clearance, and rotor to straight edge clearance. See Figure
5.
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