Oil Pump: Inspection

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

Fig 1: Inspecting Relief Valve

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If it does not, replace the relief valve. If necessary, replace the oil pump assembly.

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

Fig 2: Measuring Rotor Side Clearance

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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.

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

Fig 3: Measuring Clearance Between Drive And Driven Rotors

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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.

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

Fig 4: Measuring Clearance Between Driven Rotor And Body

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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.