Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Oil Pump: Inspection
- INSPECT RELIEF VALVE
Coat the valve with engine oil and check that it falls smoothly into the valve hole by its own weight.
If it does not, replace the relief valve. If necessary, replace the oil pump assembly.
- INSPECT ROTOR SIDE CLEARANCE
Using a feeler gauge and precision straight edge, measure the clearance between the rotors and precision straight edge.
Standard side clearance:
0.03 - 0.09 mm (0.0012 - 0.0035 in.)
Maximum side clearance:
0.15 mm (0.0059 in.)
If the side clearance is greater than maximum, replace the rotors as a set. If necessary, replace the oil pump assembly.
- INSPECT ROTOR TIP CLEARANCE
Using a feeler gauge, measure the clearance between the drive and driven rotor tips.
Standard tip clearance:
0.060 - 0.180 mm (0.0024 - 0.0071 in.)
Maximum tip clearance:
0.28 mm (0.0110 in.)
If the tip clearance is greater than maximum, replace the rotors as a set.
- INSPECT ROTOR BODY CLEARANCE
Using a feeler gauge, measure the clearance between the driven rotor and body.
Standard body clearance:
0.250 - 0.325 mm (0.00984 - 0.01280 in.)
Maximum body clearance:
0.425 mm (0.01673 in.)
If the body clearance is greater than maximum, replace the rotors as a set. If necessary, replace the oil pump assembly.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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