Oil Pump: Service and Repair

Oil Pump, Screen, and Crankshaft Oil Deflector Replacement

Special Tools

* EN-48853 - Front Cover Alignment Tool

* J 41480 - Front and Rear Cover Alignment

Removal Procedure

1. Remove the engine front cover. Refer to Engine Front Cover Replacement (Except 6.2L (LS9) and 7.0L) Service and RepairEngine Front Cover Replacement (6.2L and 7.0L) Service and Repair.

2. Remove the engine oil pan. Refer to Oil Pan Replacement (w/o LS9) Oil Pan Replacement.




3. Remove the crankshaft oil deflector nuts (403).

4. Remove the crankshaft oil deflector (425).




5. Remove the oil pump bolts.

Note: Do not allow dirt or debris to enter the oil pump assembly. Cap ends, as necessary.

6. Remove the oil pump (413).

7. Clean and inspect the oil pump. Refer to Oil Pump Cleaning and Inspection (6.2L LS3) 53. Oil Pump Cleaning and InspectionOil Pump Cleaning and Inspection (6.2L LS9) Oil Pump Cleaning and Inspection (LS3 with Z52 Option, LS7) 54. Oil Pump Cleaning and Inspection (with Z52 Option).

Installation Procedure

Note: Inspect the engine block oil gallery passages. These surfaces must be clear and free of debris or restrictions.




1. Align the splines of the crankshaft sprocket and the oil pump drive gears, and install the oil pump (413).

2. Install the oil pump onto the crankshaft sprocket until the pump housing contacts the face of the engine block.

3. Install the oil pump bolts (411). Do not tighten the bolts at this time.




4. Align the oil pump surfaces (1) with the engine block surfaces (2). The oil pump must be aligned flush or no greater than 0.1 mm (0.04 in) below the engine block oil pan rail.





Caution: Refer to Fastener Caution Fastener Caution.

5. Install the EN-48853 - front cover alignment tool and bolts to the engine block. Tighten the EN-48853 - front cover alignment tool bolts to 25 Nm (18 lb ft).

6. Firmly push the oil pump until the pump surfaces contact the J 41480 - front and rear cover alignment. Continue to retain the pump to the J 41480 - front and rear cover alignment. Tighten the oil pump bolts to 25 Nm (18 lb ft).




7. Install the crankshaft oil deflector (425) and nuts (403). Install the deflector onto the engine with the word "Rear" at the back of the engine block. Tighten the crankshaft oil deflector nuts to 25 Nm (18 lb ft).

8. Install the engine oil pan. Refer to Oil Pan Replacement (w/o LS9) Oil Pan Replacement.

9. Install the engine front cover. Refer to Engine Front Cover Replacement (Except 6.2L (LS9) and 7.0L) Service and RepairEngine Front Cover Replacement (6.2L and 7.0L) Service and Repair.