1. Remove the engine front cover. Refer to Engine Front Cover Replacement .
2. Remove the engine oil pan. Refer to Oil Pan Replacement .
3. Remove the oil pump screen bolt and nut.
4. Remove the oil pump screen and O-ring seal.
5. Remove the O-ring seal from the pump screen.
6. Discard the O-ring seal.



7. Remove the remaining crankshaft oil deflector nuts.
8. Remove the crankshaft oil deflector.



9. Remove the oil pump bolts.

Important: Do not allow dirt or debris to enter the oil pump, cap the ends as necessary.

10. Remove the oil pump.
11. Clean and inspect the oil pump. Refer to Oil Pump Cleaning and Inspection in Engine Mechanical - 5.7L Unit Repair.

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

1. Align the splined surfaces of the crankshaft sprocket and the oil pump drive gear and install the oil pump.
2. Install the oil pump onto the crankshaft sprocket until the pump housing contacts the face of the engine block.

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

3. Install the oil pump bolts.

Tighten
Tighten the oil pump bolts to 25 N·m (18 lb ft).




4. Install the crankshaft oil deflector.
5. Install the crankshaft oil deflector nuts.

Tighten
Tighten the crankshaft oil deflector nuts to 25 N·m (18 lb ft).




6. Lubricate a NEW oil pump screen O-ring seal with clean engine oil.
7. Install the NEW O-ring seal onto the oil pump screen.

Important: Push the oil pump screen tube completely into the oil pump prior to tightening the bolt. Do not allow the bolt to pull the tube into the pump.

Align the oil pump screen brackets with the correct crankshaft bearing cap studs.
8. Install the oil pump screen.
9. Install the oil pump screen bolt and nut.

Tighten

•	Tighten the oil pump screen bolt to 12 N·m (106 lb in).

•	Tighten the oil pump screen nut to 25 N·m (18 lb ft).

10. Install the engine oil pan. Refer to Oil Pan Replacement .
11. Install the engine front cover. Refer to Engine Front Cover Replacement .