4.8L, 5.3L, 6.0L & 6.2L Engines Oil Pump Replacing?

The details here are for following car models.
Chevrolet, GMC and Cadillac.
It covers
Escalade, Suburban 1500 & 2500, Tahoe, Yukon, Yukon XL 1500 & 2500 (2006-2007), Yukon Denali and Yukon Denali XL (2005-2006).

The engine models covered are
4.8L, 5.3L, 6.0L & 6.2L Engines in one section and
8.1L engine in other section.
Go through both section.


Oil Pump
INSPECTION

Procedure is as follows:----

NOTE
The internal parts of the oil pump assembly are not serviced separately, excluding the spring. If the oil pump components are worn or damaged, replace the oil pump as an assembly.


NOTE
The oil pump pipe and screen are to be serviced as an assembly. Do not attempt to repair the wire mesh portion of the pump and screen assembly.

Clean the parts in solvent.
Dry the parts with compressed air.

Inspect the oil pump housing and the cover for cracks, excessive wear, scoring, or casting imperfections.
Inspect the oil pump housing-to-engine block oil gallery surface for scratches or gouging.
Inspect the oil pump housing for damaged bolt hole threads.
Inspect the relief valve plug and plug bore for damaged threads.
Inspect the oil pump internal oil passages for restrictions.
Inspect the drive gear and driven gear for chipping, galling or wear. Minor burrs or imperfections on the gears may be removed with a fine oil stone.
Inspect the drive gear splines for excessive wear.
Inspect the pressure relief valve and bore for scoring or wear. The valve must move freely in the bore with no restrictions.
Inspect the oil pump screen for debris or restrictions.
Inspect the oil pump screen for broken or loose wire mesh.

Fig. Exploded view of oil pump-4.8L, 5.3L, 6.0L and 6.2L engines


8.1L Engine

CAUTION

Wear safety glasses in order to avoid eye damage.

Fig. Exploded view of oil pump-8.1L engines

1. Clean the oil pump components in cleaning solvent.
2. Dry the components with compressed air.
3. Inspect the gears for the following:
   
   
   Scoring
   

   Chipping
   

   Galling
   

   Excessive wear
   
4. Inspect the oil pump housing for the following:
   
   
   Damaged bolt hole threads
   

   Worn oil pump driveshaft bore
   

   Scoring or excessive wear within the housing
   

   Worn driven gear shaft
   
5. Inspect for a collapsed pressure relief valve spring.
6. Inspect the pressure relief valve for scoring or wear. The valve should move freely within the bore of the housing.

Removal & Installation

4.8L, 5.3L, 6.0L & 6.2L Engines


 

Fig. Exploded view of the oil pump mounting-4.8L, 5.3L, 6.0L and 6.2L engines

 

Fig. Oil pump disassembly-4.8L, 5.3L, 6.0L and 6.2L engines

1. Remove or disconnect the following:
   
   NOTE

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

   The internal parts of the oil pump assembly are not serviced separately (excluding the spring). If the oil pump components are worn or damaged, replace the oil pump as an assembly. Do not attempt to repair the wire mesh portion of the pump and screen assembly.
   
   
   
   
   Engine front cover
   

   Oil pan
   

   Oil pump screen bolt and nuts
   

   Oil pump screen with O-ring seal.
   

   O-ring seal from the pump screen. Discard the O-ring seal.
   

   Remaining crankshaft oil deflector nuts.
   

   Crankshaft oil deflector
   

   Oil pump bolts
   
   
   
   
   
   Oil pump
   

To install:

NOTE

Inspect the oil pump and 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. Install the oil pump onto the crankshaft sprocket until the pump housing contacts the face of the engine block.
2. Install or connect the following:
   
   NOTE

   Lubricate a NEW oil pump screen O-ring seal with clean engine oil.
   
   
   
   NOTE

   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.
   
   
   
   
   Oil pump bolts. Tighten the oil pump bolts to 18 ft. lbs. (25 Nm).
   

   Crankshaft oil deflector
   
   
   
   
   
   NEW O-ring seal onto the oil pump screen
   
3. Align the oil pump screen mounting brackets with the correct crankshaft bearing cap studs.
4. Install or connect the following:
   
   
   Oil pump screen
   

   Oil pump screen bolt and the deflector nuts. Tighten the bolt to 106 inch lbs. (12 Nm) and the nuts to 18 ft. lbs. (25 Nm).
   

   Oil pan
   

   Engine front cover
   

8.1L Engine

1. Remove or disconnect the following:
   
   
   Oil pan
   

   Oil pump screen bolt
   

   Oil pump, retainer and driveshaft. Discard the driveshaft retainer
   

   Crankshaft oil deflector nuts
   

   Crankshaft oil deflector
   

   Oil pump bolts
   

   Oil pump
   
2. Clean and inspect the oil pump 
   
   
   
   Fig. Oil pump removal-8.1L engines

To install:

1. Install the crankshaft oil deflector. Tighten the nuts to 37 ft. lbs. (50 Nm).
   
   NOTE

   Always replace the retainer between the oil pump and the shaft, when installing the oil pump. During assembly, install a new oil pump driveshaft retainer. To ease installation, slightly heat the retainer to above room temperature.
2. Assemble the oil pump, driveshaft and a new retainer.
3. Install or connect the following:
   
   
   Oil pump, positioning it on the locating pins
   

   Oil pump bolt and tighten to 56 ft. lbs. (75 Nm)
   

   Oil pan
   
4. Refill the engine crankcase
5. Disable the ignition system; crank engine for approximately 10 seconds to aid in priming the oil pump and reducing the risk of engine damage.
   
   NOTE

   If the oil pump does not build up oil pressure almost immediately, remove the pan and check for a loose oil pump-to-pick-up tube attachment. If necessary dismantle the pump and pack the pump cavity with petroleum jelly. Running the engine without measurable oil pressure will cause extensive damage.

These details will help.

Thanks.           

FOR MORE HELP GO TO: ---

Car repair guide?

http://technoanswers.blogspot.in/2012/03/car-repair-guide.html