Oil Pump

OIL PUMP

Components





Oil Pump Disassembly



1. REMOVE OIL SEAL RINGS
Remove the two oil seal rings from the stator shaft back side.





2. REMOVE THRUST WASHER FROM STATOR SHAFT BACK SIDE





3. REMOVE STATOR SHAFT
Remove the eleven bolts and stator shaft.

HINT: Keep the gears in assembly order.





4. REMOVE FRONT OIL SEAL
Pry off the oil seal with a screwdriver.


Oil Pump Bushing Inspection



1. CHECK BODY CLEARANCE OF DRIVEN GEAR
Push the driven gear to one side of the body. Using a feeler gauge, measure the clearance.

Standard body clearance: 0.07 - 0.16 mm (0.0028 - 0.0059 inch)
Maximum body clearance: 0.3 mm (0.012 inch)

If the body clearance is greater than the maximum, replace the oil pump body subassembly.





2. CHECK TIP CLEARANCE OF DRIVEN GEAR
Measure between the driven gear teeth and the crescent-shaped part of the pump body.

Standard tip clearance: 0.11 - 0.14 mm (0.0043 - 0.0055 inch)
Maximum tip clearance: 0.3 mm (0.012 inch)

If the tip clearance is greater than the maximum, replace the oil pump body subassembly.





3. CHECK SIDE CLEARANCE OF BOTH GEARS
Using a steel straightedge and a feeler gauge, measure the side clearance of both gears.

Standard side clearance: 0.002 - 0.005 mm (0.0008 - 0.0020 inch)
Maximum side clearance: 0.1 mm (0.004 inch)

There are three different thickness for drive and driven gears. Drive and driven gear thickness:





Drive and driven gear thickness:
If the thickest gear can not make the side clearance within standard specification, replace the oil pump body subassembly.





4. CHECK OIL PUMP BODY BUSHING
Using a dial indicator, measure the inside diameter of the oil pump body bushing.

Maximum inside diameter: 38.18 mm (1.5031 inch)

If the inside diameter is greater than the maximum, replace the oil pump body subassembly.





5. CHECK STATOR SHAFT BUSHING
Using a dial indicator, measure the inside diameter stator shaft bushing.

Maximum inside diameter: 21.57 mm (0.8492 inch)

If the inside diameter is greater than the maximum, replace the stator shaft.


Oil Pump Assembly



1. INSTALL FRONT OIL SEAL
Using Special Service Tool (SST) and a hammer, install a new oil seal. The seal end should be flush with the outer edge of the pump body.
SST 09350-32014 (09351-32140)





2. INSTALL DRIVEN GEAR AND DRIVE GEAR
Make sure the top of the gears are facing upward.





3. INSTALL STATOR SHAFT TO PUMP BODY
a. Align the stator shaft with each bolt hole.
b. Torque the eleven bolts.

Torque: 10 Nm (100 kgf-cm, 7 ft. lbs.)





4. INSTALL THRUST WASHER
a. Coat the thrust washer with petroleum jelly.
b. Align the tab of the washer with the hollow of the pump body.





5. INSTALL OIL SEAL RINGS
Install the two oil seal rings to the stator shaft back side.

NOTICE: Do not spread the ring ends more then necessary.

HINT: After installing the oil seal rings, check that they move smoothly.





6. CHECK PUMP DRIVE GEAR ROTATION
Turn the drive gear with two screwdrivers and make sure it rotates smoothly.

NOTICE: Be careful not to damage the oil seal lip.