Oil Pump: Inspection

Using feeler gauge, measure clearance between driven rotor and pump body. Standard clearance is .004-.007" (.10-.17 mm). Maximum clearance is .008" (.20 mm). If clearance is greater than specification, replace oil pump rotor set and/or the pump body. See Fig 1.
Measure clearance between both rotor tips. Standard clearance is .0016-.0063" (.040-.160 mm). Maximum clearance is .008" (.20 mm). If clearance is greater than maximum, replace oil pump rotor set. See Fig 1.

Fig 1: Checking Oil Pump Clearances
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Inspect relief valve components for wear or damage. Ensure relief valve operating pressure is within limits. Standard pressure is 51-63 psi (3.6-4.4 kg/cm² ). Replace oil seal if worn or damaged.