Oil Pump: Testing and Inspection
INSPECTIONFront Case
1. Check the front case for cracks or damage. Replace as necessary.
2. Check the front oil seal for worn or damaged lips. Replace if defective.
Front Case and Oil Pump Cover
Worn (especially stepped) or damaged surfaces contacting gears.
Oil Pump Gears
1. Worn or damaged gear tooth surfaces.
2. Clearance between outer gear and front case.
Clearance between outer circumference and front case: 0.12-0.185mm (0.005-0.007 inch)
3. Check the tip clearance on the pump rotor
Standard value: 0.025-0.069 mm (0.001-0.003 inch)
4. Check the axial clearance on the outer pump rotor
Standard value: 0.06-0.11 mm (0.0024-0.0043 inch)
5. Check the axial clearance on the inner pump rotor.
Standard value: 0.04-0.085 mm (0.0016-0.0033 inch)
Relief Valve and Spring
1. Check sliding condition of the relief valve inserted in the front rim up
2. Inspect for distorted or broken relief valve spring.
Standard value:
Free height: 43.8 mm (1.724 inch)
Load: 3.7 kg/40.1 mm (8.14 lb/1.579 inch)