Oil Pump Inspection

Oil Pump Inspection

Oil Pump Assembly Disassembly and Reassembly

Oil Pump

- Check outer rotor (1), inner rotor (2), oil pump cover and oil pump housing for excessive wear or damage.





- Check relief valve (1) for smooth moving and any damage.






Radial clearance

Check radial clearance between outer rotor (2) and oil pump housing (3) using feeler gauge (1).

If clearance is out of specification, replace oil pimp assembly.

Oil pump radial clearance
Standard: 0.150 - 0.210 mm (0.0059 - 0.0083 in.)





Side clearance

Using straightedge (1) and feeler gauge (2), measure side clearance of inner rotor.

If side clearance is out of specification, replace oil pump assembly.

Oil pump side clearance for oil pump inner rotor
Standard: 0.035 - 0.070 mm (0.0014 - 0.0027 in.)





Oil pump housing

Check clearance between hub of inner rotor (1) and oil pump housing (2) as follows.
1) Measure outside diameter of hub of inner rotor (1) using micrometer.
2) Measure inside diameter of oil pump housing (2) using bore gauge.
3) Calculate difference between diameters measured in Step 1) and Step 2).

If clearance is out of specification, replace oil pump assembly.

Oil pump housing clearance










Relief valve spring tension

Check relief valve spring tension as shown in figure.

If measured tension is out of specification, replace oil pump assembly.

Relief valve tension
Loaded at spring length 48.0 mm (1.89 in)
Standard: 123 - 126 N (12.5 - 12.8 kgf, 27.7 - 28.3 lbf)