Valve Lash Adjustment

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: View Of Crankshaft Balancer Mark Aligned With Engine Mark

Courtesy of GENERAL MOTORS CORP.

Rotate the crankshaft to bring the number 1 cylinder at the top dead center of the compression stroke. The number 1 cylinder is the front cylinder on the right bank. The mark on the crankshaft balancer should be aligned with the mark on the engine.

Fig 2: View Of Feeler Gage Between Tip Of Rocker Arm & Valve Lifter Bridge

Courtesy of GENERAL MOTORS CORP.

Loosen the valve adjusting screws.
Insert a feeler gauge between the tip of the rocker arm and the valve bridge.

Fig 3: Identifying Valves To Adjust When #1 Cylinder Is At TDC Of Compression Stroke

Courtesy of GENERAL MOTORS CORP.

NOTE: Refer to Fastener Notice .

Adjust the valve lash to 0.3 mm (0.012 in). Refer to Valve Clearance Adjustment Specifications to determine which valves that can be adjusted when the engine is at Top Dead Center.
Tighten: Tighten the valve lash lock nut to 22 N.m (16 lb ft).

Fig 4: View Of Crankshaft Balancer Mark Aligned With Engine Mark

Courtesy of GENERAL MOTORS CORP.

Rotate the crankshaft one revolution to bring the number 1 cylinder at Top Dead Center of the exhaust stroke.

Fig 5: Identifying Valves To Adjust When #1 Cylinder Is At TDC Of Exhaust Stroke

Courtesy of GENERAL MOTORS CORP.

Adjust the valve lash to 0.3 mm (0.012 in). Refer to Valve Clearance Adjustment Specifications to determine which valves that can be adjusted when the engine is at Top Dead Center.
Tighten: Tighten the valve lash lock nut to 22 N.m (16 lb ft).