Oil Pump: Service and Repair

Oil Pump Replacement

Removal Procedure





1. If RWD vehicle, remove the engine flywheel housing.
2. Remove the engine front cover.
3. Remove the upper oil pan.
4. Remove the oil pump pipe and screen assembly bolts and nuts.
5. Remove the oil pump pipe and screen assembly.
6. Remove the oil pump pipe and screen assembly gasket.





7. Block the crankshaft from turning with a wooden handle.





8. While holding the secondary oil pump shaft with a hex driver, remove the oil pump driven gear nut.





9. Remove the oil pump driven gear.





Important: Do not damage the crankshaft reluctor assembly. Do not remove the crankshaft reluctor to oil pump drive bolts.

10. Remove the oil pump drive gear and crankshaft reluctor assembly.
- Use a brass drift.
- Tap on the back as close to the center of the reluctor assembly.





11. Remove the 3 hex head and the 1 allen head bolt in order to remove the oil pump.
12. Remove the oil pump.
13. Remove the O-ring seal for the oil pump.

Inspection and Repair





1. Remove the oil pump gear cover bolts.
2. Remove the oil pump gear cover.





3. Use a feeler gauge to measure the clearance between the gear teeth and the oil pump housing. The production clearance is 0.125 - 0.221 mm (0.0049 - 0.0087 inch) and the service limit is 0.221 mm (0.0087 inch).
4. Replace the oil pump assembly if the clearance exceeds the service limit.





5. Use a feeler gauge and a straightedge to measure the clearance between the side of the gear and the cover. The production clearance is 0.064 - 0.109 mm (0.0025 - 0.0043 inch) and the service limit is 0.109 mm (0.0043 inch).
6. Replace the oil pump assembly if the clearance exceeds the service limit.





7. Calculate the driven gear shaft to bushing clearance.
7.1. Measure the driven gear shaft outside diameter. The production specification is 19.947 - 19.960 mm (0.7853 - 0.7858 inch) and the service limit is 19.86 mm (0.7819 inch).
7.2. Measure the driven gear bushing inside diameter. The production value is 20 mm (0.7874 inch).
7.3. Calculate the driven gear shaft to bushing clearance. The service limit is 0.14 mm (0.0055 inch).
8. Replace the oil pump assembly if the clearance exceeds the service limit.





9. Install the oil pump gear cover to the oil pump assembly.

Notice: Refer to Fastener Notice in Service Precautions.

10. Install the oil pump gear cover bolts.
- Tighten the oil pump gear cover bolts to 21 Nm (15 ft. lbs.).

Installation procedure





1. Install a new O-ring seal for the oil pump.
2. Install the oil pump.

Notice: Refer to Fastener Notice in Service Precautions.

3. Install the oil pump bolts.
- Tighten the oil pump bolts to 21 Nm (15 ft. lbs.).
4. Inspect the oil pump drive gear for wear.
5. Replace the oil pump drive gear pin if worn.





6. Install the oil pump drive gear and reluctor assembly to the crankshaft.





7. Install the oil pump driven gear.





8. While holding the secondary oil pump shaft with a hex driver, install the oil pump driven gear nut.
- Tighten the oil pump driven gear nut to 100 Nm (74 ft. lbs.).





9. If 4WD vehicle, install the oil pump pipe and screen gasket to the oil pump.
10. If 4WD vehicle install the oil pump pipe and screen.
11. If 4WD vehicle, install the oil pump pipe and screen assembly bolts and nuts.
- Tighten the oil pump pipe and screen assembly bolts to 25 Nm (18 ft. lbs.).
- Tighten the oil pump pipe and screen assembly nuts to 25 Nm (18 ft. lbs.).
12. Install the engine front cover.
13. If RWD, install the engine flywheel housing.
14. Install the upper oil pan.