Chevrolet Silverado / GMC Sierra. Service manual — part 135

Fig. 455: Crankshaft Rear Oil Seal Housing Locator Spring
Courtesy of GENERAL MOTORS CORP.

12. Remove the crankshaft rear oil seal housing locator spring type S pin, if required.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

Fig. 456: Front Of Engine Block Front Oil Gallery Plugs Or Balls
Courtesy of GENERAL MOTORS CORP.

13. Remove the front oil gallery plugs or balls from the front of the engine block and discard.

Insert a 3/8 x 26 inch rod into the rear oil gallery holes in order to drive out the front oil
gallery plugs or balls.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

Fig. 457: Engine Block Core Hole Plugs
Courtesy of GENERAL MOTORS CORP.

14. Remove the engine block core hole plugs.

1. Use a suitable tool in order to drive the engine block core hole plugs into the coolant

jacket.

2. Use a suitable tool in order to pull the engine block core hole plugs from the coolant

jacket.

3. Discard the engine block core hole plugs.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

Fig. 458: Identifying Oil Filter Bypass Valve
Courtesy of GENERAL MOTORS CORP.

15. Remove the oil filter bypass valve and discard.

ENGINE BLOCK CLEANING AND INSPECTION

Tools Required

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado