Disassembly
Remove the oil pump cover
Remove the inner and outer rotors.
Remove plug and plunger spring.
Remove the control plunger.
Remove the oil pump housing.
Examination
Pic. 2.298. Gap measurement between inner and outer rotors
Measure the clearance between the inner rotor and the outer rotor using a feeler gauge (pic. 2.298).
If the gap is greater than the maximum, replace the inner rotor, outer rotor, or both.
- Standard gap between tooth heads: 0.18 mm.
- Maximum gap between tooth heads: 0.20 mm.
Pic. 2.299. Gap measurement with outer rotor and housing
Measure the gap between the outer rotor and the housing using a feeler gauge (pic. 2.299).
If the clearance is greater than the maximum, replace the outer rotor, oil pump housing, or outer rotor with housing.
- Standard clearance: 0.175 mm.
- Maximum clearance: 0.20 mm.
Pic. 2.300. Measuring the side clearance of the oil pump housing
Measure side clearance using a feeler gauge (pic. 2.300).
If the clearance is greater than the maximum, replace the inner rotor, oil pump housing, or inner rotor with housing.
- Standard backlash: 0.03 - 0.07 mm.
- Maximum side clearance: 0.09 mm.
Pic. 2.301. Measuring plunger spring length
Measure the free length of the plunger spring using a vernier caliper (pic. 2.301).
If the length is not correct, replace the plunger spring.
Free plunger spring length: 45.94 mm.
Assembly
Install the oil pump housing.
Install the control plunger, plunger spring and plug.
Pic. 2.302. Alignment of inner and outer rotor marks
Align the marks of the inner and outer rotors and assemble them (pic. 2.302).
Install the rotors and oil pump cover.