Chevrolet Silverado / GMC Sierra. Service manual — part 204

Fig. 682: Locating Cylinder Head Bolts (Left)
Courtesy of GENERAL MOTORS CORP.

6. Apply sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent, to the threads of

the NEW cylinder head bolts.

7. Install the NEW cylinder head bolts finger tight.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

Fig. 683: Cylinder Head Bolt Tightening Sequence
Courtesy of GENERAL MOTORS CORP.

8. Tighten the cylinder head bolts in sequence on the first pass.

Tighten: Tighten the bolts in sequence on the first pass to 30 N.m (22 lb ft).

9. Use the J 45059 in order to tighten the cylinder head bolts in sequence on the final pass. See

Special Tools.

Tighten:

Tighten the long bolts (1, 4, 5, 8, and 9) on the final pass in sequence to 75 degrees.

Tighten the medium bolts (12 and 13) on the final pass in sequence to 65 degrees.

Tighten the short bolts (2, 3, 6, 7, 10, and 11) on the final pass in sequence to 55
degrees.

NOTE:

Refer to Fastener Notice .

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

Fig. 684: Locating Spark Plug Wire Support
Courtesy of GENERAL MOTORS CORP.

10. Install the spark plug wire support and bolts.

Tighten: Tighten the spark plug wire support bolts to 12 N.m (106 lb in).

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

Fig. 685: View Of Spark Plugs (Left)
Courtesy of GENERAL MOTORS CORP.

11. Measure the spark plugs for the proper gap.

Adjust the spark plug gap if necessary.

Specification: Spark plug gap to 1.52 mm (0.060 in).

12. Install the spark plugs.

Tighten: Tighten the spark plugs to 15 N.m (11 lb ft).

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado