Oil Pump Inspection: Notes

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.

Fig 1: Inspecting Oil Pump
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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.

Fig 2: Identifying Oil Relief Spring Specification
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Fig 3: Measuring Oil Relief Spring
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Measure clearance of oil pump rotor and oil pump case.