Oil Pump Inspection

Oil Pump Inspection

Oil Pump Assembly Disassembly and Reassembly

Oil Pump

- Check outer rotor (3), inner rotor and oil pump cases (1), (2) for excessive wear or damage.
If abnormal condition is found in above checks, replace oil pump assembly.
- Check relief valve (4) for excessive wear or damage.
If abnormal condition is found in above checks, replace oil pump relief valve set.











Radial Clearance

Check radial clearance between outer rotor (2) and case No.1 (1), using thickness gauge (4).

If clearance exceeds its limit, replace oil pump assembly.

Radial clearance between outer rotor and case for oil pump
Standard: 0.10 - 0.20 mm (0.0040 - 0.0078 in.)










Side Clearance

Using straightedge (5) and thickness gauge (4), measure side clearance.

If side clearance exceeds its limit, replace oil pump assembly.

Side clearance for inner and outer rotor
Standard: 0.05 - 0.13 mm (0.0020 - 0.0051 in.)










Relief Valve Spring Free Length and Load

- Measure free length and tension of oil relief spring.
If the measured values of length or tension is less than the specification, replace oil pump relief valve set.

Oil relief spring