Escalade, Suburban, Tahoe, Yukon, Denali, DenaliXL, YukonXL 1999-2005

Valve Lash (Clearance) Adjustment

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All gasoline engines and the 6.5L Diesel engine use hydraulic lifters, which require no periodic adjustment.

All engines use hydraulic lifters, which require no periodic adjustment.

All gasoline engines use hydraulic lifters, which require no periodic adjustment.

6.6L Engine



  1. Remove the fan clutch.
  2.  
  3. Remove both upper valve covers.
  4.  
  5. Rotate the engine in the normal direction and place the No. 1 piston at Top Dead Center (TDC) of the compression stroke. The No. 1 cylinder is at the right side front. While turning the engine, watch the intake valve to open and close. Align the mark on the crankshaft balancer with the pointer on the engine.
  6.  
  7. Loosen the valve clearance adjusting screws for the valve being adjusted.
  8.  
  9. Insert the feeler gauge between the tip of the rocker arm and the valve bridge.
  10.  
  11. Adjust the intake and the exhaust valve clearance to 0.012 in. (0.3mm) with the engine cold. Refer to the figure for the valves that can be adjusted TDC of the compression stroke.
  12.  
  13. Tighten the valve adjusting screw lock nut to 16 ft. lbs. (22 Nm).

    Click image to see an enlarged view

    Fig. Location of the valves that are adjusted at TDC of the compression stroke-6.6L engine

  14.  
  15. Turn the engine one rotation in the normal direction and put the No. 1 piston at TDC of the exhaust stroke to adjust the remaining valve clearance. While turning the engine, watch the exhaust valve to open and close. Align the mark on the crankshaft balancer with the pointer on the engine.
  16.  
  17. Loosen the valve clearance adjusting screws for the valves being adjusted.
  18.  
  19. Insert the feeler gauge between the tip of the rocker arm and the valve bridge.
  20.  
  21. Adjust the intake and the exhaust valve clearance to 0.012 in. (0.3mm) with the engine cold. Refer to the figure for the valves that can be adjusted TDC of the exhaust stroke.
  22.  
  23. Tighten the valve adjusting screw lock nut to 16 ft. lbs. (22 Nm).

    Click image to see an enlarged view

    Fig. Location of the valves that are adjusted at TDC of the exhaust stroke-6.6L engine

  24.  

  1. Install the upper and lower valve cover and fan clutch, as necessary.
  2.  

 
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