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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1020 (Engine Mechanical - 6.6L (LLY)) >> Repair Instructions >> Off-Vehicle Repair Instructions >> Valve Lash Adjustment

Valve Lash Adjustment

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. 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.
    2. Fig 1: View Of Crankshaft Balancer Mark Aligned With Engine Mark
    GM667477Courtesy of GENERAL MOTORS CORP.
  2. Loosen the valve adjusting screws.
  3. Insert a feeler gauge between the tip of the rocker arm and the valve bridge.
    4. Fig 2: View Of Feeler Gauge Between Tip Of The Rocker Arm & Valve Bridge
    GM663897Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Fastener Notice in Cautions and Notices.
  4. 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).

    5. Fig 3: View Of Rocker Arm Intake & Exhaust Valves 1, 2, 3, 5, 6, 7 & 8
    GM663110Courtesy of GENERAL MOTORS CORP.
  5. Rotate the crankshaft one revolution to bring the number 1 cylinder at Top Dead Center of the exhaust stroke.
    6. Fig 4: View Of Crankshaft Balancer Mark Aligned With Engine Mark
    GM667477Courtesy of GENERAL MOTORS CORP.
  6. 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.
  7. Tighten:  Tighten the valve lash lock nut to 22 N.m (16 lb ft).
    8. Fig 5: View Of Rocker Arm Intake & Exhaust Valves 2, 3, 4, 5, 6, 7 & 8
    GM660548Courtesy of GENERAL MOTORS CORP.
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