Subaru Tribeca 2006

Valve Lash (Clearance) Adjustment

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NOTE
The valve adjustment should be performed while the engine is cold.

  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Raise and support the vehicle safely.
  4.  
  5. Remove the under cover.
  6.  
  7. Lower the vehicle.
  8.  
  9. Remove the collector cover.
  10.  
  11. Disconnect the negative battery cable.
  12.  
  13. On the right side, remove the air intake duct and air cleaner case. Remove the fuel tank protector. Disconnect the oil pressure switch electrical connector. Remove the ignition coil.
  14.  
  15. On the left side, remove the battery and battery carrier. Disconnect the PCV hose from the rocker cover. Remove the ignition coil.
  16.  
  17. Remove the rocker cover retaining bolts. Remove the rocker covers from the engine.
  18.  
  19. Rotate the crankshaft clockwise until the cam is set in position, see illustration.

    Click image to see an enlarged view

    Fig. Valve adjustment crankshaft positioning

  20.  
  21. Using a feeler gauge measure and record the clearance of the intake and exhaust valve.
    NOTE
    Measure it within the range of +/- 30 degrees from the specified position, shown in the illustration. Measure it in the low cam for the intake side. Insert the feeler gauge in a horizontally as possible with respect to the valve lifter.

  22.  
  23. Further turn the crankshaft pulley clockwise and then measure and record the valve clearance again.
  24.  
  25. If adjustment is required, remove the camshafts.
  26.  
  27. Remove and measure the thickness of the valve lifter. Select a suitable shim, using the shim selection chart.
  28.  
  29. Install the replacement shim to the lifter.
  30.  
  31. After all shims have been adjusted, inspect the valve clearances again.
  32.  
  33. After completion, install all removed components.

    Click image to see an enlarged view

    Fig. Use this table to help you select a suitable exhaust valve shim



    Click image to see an enlarged view

    Fig. Use this table to help you select a suitable intake valve shim



    Click image to see an enlarged view

    Fig. Exhaust valve adjusting shim chart



    Click image to see an enlarged view

    Fig. Intake valve adjusting shim chart

  34.  

 
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