Oil Pump: Inspection

Coat the valve with engine oil and check that it falls smoothly into the valve hole by its own weight.

If it doesn't, replace the relief valve. If necessary, replace the oil pump assembly.

Fig 1: Inspecting Relief Valve

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Place the drive and driven rotors into the oil pump body with the mark facing upward.

Fig 2: Placing Drive And Driven Rotors Into Oil Pump Body With Mark Facing Upward

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Using a feeler gauge, measure the clearance between the drive and driven rotor tips.

Standard tip clearance: 

0.110 - 0.240 mm (0.0043 - 0.0094 in.) 

Maximum tip clearance: 0.35 mm (0.0138 in.) 

If the tip clearance is greater than the maximum, replace the rotors as a set.

Fig 3: Measuring Clearance Between Drive And Driven Rotor Tips Using Feeler Gauge

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Using a feeler gauge and a precision straight edge, measure the clearance between the rotors and the precision straight edge.

Standard side clearance: 

0.030 - 0.090 mm (0.0012 - 0.0035 in.) 

Maximum side clearance: 0.15 mm (0.0059 in.) 

If the side clearance is greater than the maximum, replace the rotors as a set. If necessary, replace the oil pump assembly.

Fig 4: Measuring Clearance Between Rotors And Precision Straight Edge Using Feeler Gauge

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Using a feeler gauge, measure the clearance between the driven rotor and body.

Standard body clearance: 

0.100 - 0.175 mm (0.0039 - 0.0069 in.) 

Maximum body clearance: 0.30 mm (0.0118 in.) 

If the body clearance is greater than the maximum, replace the rotors as a set. If necessary, replace the oil pump assembly.

Fig 5: Measuring Clearance Between Driven Rotor And Body Using Feeler Gauge

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