Engine Lubrication System: Inspection

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.

Fig 1: Inserting Relief Valve Into Valve Hole

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

Fig 2: Measuring Rotor 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 Rotor Tips

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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

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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.