Oil Pump: Testing and Inspection

OIL PUMP INSPECTION
Rotor Clearance Inspection
1. Measure the following clearance.





Rotor





Pump body

- Replace the rotor and/or pump body if necessary.

ZM
Standard tip clearance 0.02 - 0.18 mm (0.0008 - 0.0070 inch)
Maximum tip clearance 0.22 mm (0.0087 inch)

FS
Standard tip clearance 0.0130 - 0.206 mm (0.00512 - 0.00811 inch)
Maximum tip clearance 0.30 mm (0.012 inch)

ZM
Standard tip clearance 0.09 - 0.18 mm (0.0036 - 0.0070 inch)
Maximum tip clearance 0.22 mm (0.0087 inch)

FS
Standard tip clearance 0.113 - 0.186 mm (0.00445 - 0.00732 inch)
Maximum tip clearance 0.22 mm (0.0087 inch)





Side clearance

ZM
Standard tip clearance 0.03 - 0.11 mm (0.0012 - 0.0043 inch)
Maximum tip clearance 0.14 mm (0.0055 inch)

FS
Standard tip clearance 0.035 - 0.095 mm (0.0014 - 0.0037 inch)
Maximum tip clearance 0.14 mm (0.0055 inch)

Pressure Spring Inspection ZM
1. Measure the free length of the pressure spring.
- Replace the pressure spring if necessary.





Free length 45.94 mm (1.809 inch)
2. Apply pressing force to the pressure spring and check the spring height.
- Replace the plunger spring if necessary.





Pressing force 97.7 - 107.4 N (9.96 - 10.96 kgf, 21.92 - 24.11 lbs)
Standard height 33.50 mm (1.319 inch)