Chevrolet Silverado / GMC Sierra. Service manual — part 569

Fig. 162: View Of Right Engine Mount & Bolts
Courtesy of GENERAL MOTORS CORP.

7. Remove the right engine mount bolts.

8. Remove the right engine mount.

9. Clean the sealing material from the gasket mating surfaces of the block.

10. Clean the block in cleaning solvent.

11. Flush the engine block with clean water or steam.

12. Clean the oil passages.

13. Clean the cylinder bores.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

14. Inspect the block for cracks. Use the Magnaflux Spot check dye method, or the equivalent.

Inspect the cylinder walls.

Inspect the coolant jackets.

Inspect the crankshaft bearing webs.

Fig. 163: View Of Crankshaft Bearing Bores & Caps
Courtesy of GENERAL MOTORS CORP.

15. Inspect the crankshaft bearing bores and caps. The crankshaft bearing bore inside diameters

should be round and uniform at all of the bearing supports.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

16. Inspect the area where the crankshaft bearing inserts contact the crankshaft bearing bore.

This area must be free of burrs and scratches.

17. Inspect the engine mount bosses.

18. Inspect the cylinder head gasket mating surfaces for pitting.

Fig. 164: Measuring Engine Block To Cylinder Head Gasket Surface Area
Courtesy of GENERAL MOTORS CORP.

19. Inspect the engine block to cylinder head gasket surface area for warping. Use a straight

edge and feeler gauge. Replace the block if it is warped more than 0.15 mm (0.006 in)
longitudinally or more than 0.08 mm (0.003 in) transversely.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

20. Apply sealer to the oil gallery plugs.

Fig. 165: View Of Oil Gallery Plug
Courtesy of GENERAL MOTORS CORP.

21. Install the oil gallery plugs.

Tighten: Tighten the oil gallery plugs to 53 N.m (39 lb ft).

NOTE:

Refer to Fastener Notice .

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado