Chevrolet Silverado / GMC Sierra. Service manual — part 65

Fig. 196: Cylinder Head Bolt Tightening Sequence
Courtesy of GENERAL MOTORS CORP.

7. Tighten the cylinder head bolts using the sequence shown.

Tighten:

Tighten the bolts a first pass to 30 N.m (22 lb ft).

Tighten the long bolts (1, 4, 5, 8, 9) a final pass to 75 degrees using J 45059 . See
Special Tools.

Tighten the medium bolts (12, 13) a final pass to 65 degrees using J 45059 . See
Special Tools.

Tighten the short bolts (2, 3, 6, 7, 10, 11) a final pass to 55 degrees using J 45059 .
See Special Tools.

NOTE:

Refer to Fastener Notice .

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

Fig. 197: Spark Plug Wire Support
Courtesy of GENERAL MOTORS CORP.

8. Install the spark plug wire support and bolts.

Tighten: Tighten bolts to 12 N.m (106 lb in).

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

Fig. 198: Locating Spark Plugs
Courtesy of GENERAL MOTORS CORP.

9. Install the spark plugs.

10. If installing NEW spark plugs measure for the correct gap. Adjust the spark plug gap, if

necessary.

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

Tighten:

Tighten the plugs on a USED cylinder head to 15 N.m (11 lb ft).

Tighten the plugs on the initial installation of a NEW cylinder head to 30 N.m (22 lb
ft).

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

Fig. 199: View Of Generator Bracket Stud
Courtesy of GENERAL MOTORS CORP.

11. Install the generator bracket stud.

Tighten: Tighten the stud to 20 N.m (15 lb ft).

12. Install the right pushrods. Refer to Valve Rocker Arm and Push Rod Replacement.

13. Install the exhaust manifold. Refer to Exhaust Manifold Replacement - Right Side

(4.3L) .

14. Install the intake manifold. Refer to Lower Intake Manifold Replacement.

15. Install the generator bracket. Refer to Generator Bracket Replacement (4.3L) .

16. Fill the cooling system. Refer to Cooling System Draining and Filling (Vac-N-Fill) or

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado