Engine Oil Pump - Inspection

INSPECTION





1. Lay a straightedge (1) across the pump cover (3) surface. If a 0.076 mm (0.003 in.) feeler gauge (2) can be inserted between cover and straight edge, cover should be replaced.




2. Measure the outer rotor thickness.




3. Measure the inner rotor thickness.
4. If either rotor thickness measures 18.92 mm (0.744 in.) or less, replace rotor set.
5. Measure outer rotor diameter. If the outer rotor diameter is 82.45 mm (3.246 in.) or less, replace rotor set.




6. Measure clearance between outer rotor (2) and case. If measurement is 0.19 mm (0.007 in.) or more, and outer rotor (2) is within specification, replace chain case cover.




7. Measure tip clearance between the outer rotor (2) and inner rotor (3). If clearance between inner (3) and outer rotors (2) is 0.150 mm (0.006 in.) or more, replace rotor set.
8. Place a straightedge across the face of the chain case cover, in between the bolt holes. If a feeler gauge of 0.077 mm (0.003 in.) or more can be inserted between rotors and the straightedge, and the rotors are within specification, replace the case cover.
9. Inspect oil pressure relief valve operationProcedures.
10. If oil pressure is low and pump is within specifications, inspect for worn engine bearings or other reasons for oil pressure loss.