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: Coating Valve With Engine Oil

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

Fig 2: Placing Drive & 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.

1. Standard tip clearance: 0.110 - 0.240 mm (0.0043 - 0.0094 in.) 
2. Maximum tip clearance: 0.35 mm (0.0138 in.) 

Fig 3: Measuring Clearance Between Drive & Driven Rotor Tips

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

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

1. Standard side clearance: 0.030 - 0.090 mm (0.0012 - 0.0035 in.) 
2. Maximum side clearance: 0.15 mm (0.0059 in.) 

Fig 4: Measuring Clearance Between Rotors & Precision Straight Edge

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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 driven rotor and body.

1. Standard body clearance: 0.100 - 0.175 mm (0.0039 - 0.0069 in.) 
2. Maximum body clearance: 0.30 mm (0.0118 in.) 

Fig 5: Measuring Clearance Between Driven Rotor & Body

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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