Chevrolet Silverado / GMC Sierra. Service manual — part 207

Fig. 694: Locating Spark Plugs
Courtesy of GENERAL MOTORS CORP.

12. 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).

13. Install the spark plugs.

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

VALVE ROCKER ARM AND PUSH ROD INSTALLATION

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

Fig. 695: View Of Valve Pushrods
Courtesy of GENERAL MOTORS CORP.

1. Install the valve pushrods.

IMPORTANT: Be sure to keep parts in order. Parts must be reinstalled into

the original location and position.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

Fig. 696: Locating Arrow On Valve Rocker Arm Support
Courtesy of GENERAL MOTORS CORP.

2. Install the valve rocker arm supports.

IMPORTANT: Be sure that the arrow on the valve rocker arm support is in

the up position.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

Fig. 697: Pushrod Socket, Roller Pivot & Valve Stem Tip
Courtesy of GENERAL MOTORS CORP.

3. Apply prelube GM P/N 12345501 (Canadian P/N 992704) or equivalent, to the following

valve rocker arm contact surfaces:

Valve pushrod socket (1)

Roller pivot (2)

Valve stem tip (3)

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado