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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 9 (Engine Mechanical - 6.6L - On Vehicle Repair Instructions) >> On-Vehicle Repair Instructions >> Valve Clearance Adjustment

Valve Clearance Adjustment

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  1. Remove the fan clutch. Refer to Fan Clutch Replacement (Diesel) .
  2. Remove the upper valve rocker arm covers. Refer to Valve Rocker Arm Cover Replacement - Upper Left  and Valve Rocker Arm Cover Replacement - Upper Right .
  3. Rotate the crankshaft in order to bring the number 1 cylinder to top dead center (TDC) 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 1: View Of Crankshaft Balancer Mark Aligned With Engine Mark
    GM667477Courtesy of GENERAL MOTORS CORP.
  4. Loosen the valve adjusting screws.
  5. Insert a feeler gauge between the tip of the rocker arm and the valve bridge.
    Fig 2: Measuring Valve Lash Adjustment
    GM663897Courtesy 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 can be adjusted when the engine is at TDC.
    Fig 3: Identifying Valves To Adjust With #1 Cylinder At TDC On Compression Stroke
    GM663110Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Fastener Notice .
  7. Tighten the lock nut.

    Tighten:  Tighten nut to 22 N.m (16 lb ft).

  8. Rotate the crankshaft one revolution in order to bring the number 1 cylinder to TDC of the exhaust stroke.
    Fig 4: View Of Crankshaft Balancer Mark Aligned With Engine Mark
    GM667477Courtesy of GENERAL MOTORS CORP.
  9. Loosen the valve adjusting screws.
  10. Insert a feeler gage between the tip of the rocker arm and the valve bridge.
    Fig 5: Measuring Valve Lash Adjustment
    GM663897Courtesy of GENERAL MOTORS CORP.
  11. Adjust the valve clearance to 0.3 mm (0.0112 in). Refer to Valve Clearance Adjustment Specifications to determine which valves can be adjusted when the engine is at TDC.
    Fig 6: Identifying Valves To Adjust With #1 Cylinder At TDC On Exhaust Stroke
    GM660548Courtesy of GENERAL MOTORS CORP.
  12. Tighten the lock nut.

    Tighten:  Tighten nut to 22 N.m (16 lb ft).

  13. Install the upper valve rocker arm covers. Refer to Valve Rocker Arm Cover Replacement - Upper Left  and Valve Rocker Arm Cover Replacement - Upper Right .
  14. Install the fan clutch. Refer to Fan Clutch Replacement (Diesel) .
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