Oil Pump: Testing and Inspection

OIL PUMP INSPECTION [MZR 1.5]

WARNING:
- Continuous exposure to USED engine oil has caused skin cancer in laboratory mice. Protect your skin by washing with soap and water immediately after working with engine oil.

1. Remove the oil pump. Removal and Replacement

2. Disassemble the oil pump. Overhaul

3. Measure the tip clearance between the inner rotor and the outer rotor using a feeler gauge.






1 If it exceeds the maximum specification, replace the inner rotor or the outer rotor, or the both.

Oil pump rotor tip clearance
- Standard: 0.02-0.18 mm {0.0008-0.0070 in}
- Maximum: 0.20 mm {0.0079 in}

4. Measure the body clearance between the outer rotor and the oil pump body using a feeler gauge.






1 If it exceeds the maximum specification, replace the outer rotor or oil pump body, or both.

Oil pump rotor body clearance
- Standard: 0.090-0.175 mm {0.0036-0.0068 in}
- Maximum: 0.20 mm {0.0079 in}

5. Measure the side clearance using a straight edge and a feeler gauge.






1 If it exceeds the maximum specification, replace the inner rotor or oil pump body, or the both.

Oil pump rotor side clearance
- Standard: 0.03-0.07 mm {0.0012-0.0027 in}
- Maximum: 0.09 mm {0.004 in}

6. Measure the free length of the plunger spring using the vernier caliper.






1 If it is less than the specification, replace the plunger spring.

Oil pump plunger spring free length
1 45.94 mm {1.809 in}