Sentra 2007

Valve Lash (Clearance) Adjustment

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NOTE
Valves are adjusted by changing lifters. There are 26 different thicknesses of Nissan valve lifter available in sizes ranging from 3.00 to 3.50 mm (0.1181 to 0.1378 in) in steps of 0.02 mm (0.0008 in.).

  1. Remove the rocker cover.
  2.  
  3. Rotate crankshaft to TDC on No.1 cylinder. Align TDC mark (no paint) to timing indicator on front cover.
  4.  
  5. Measure and record valve clearance at the cam lobes indicated.

    Click image to see an enlarged view

    Fig. With engine at TDC No. 1, check valve clearance at these cam lobes-2.0L engine



    Click image to see an enlarged view

    Fig. With engine at TDC No. 1, check valve clearance at these cam lobes-2.5L engine

  6.  
  7. Rotate the crankshaft one full turn to TDC No. 4.
  8.  
  9. Measure and record valve clearance at the remaining cam lobes.
  10.  
  11. If adjustment is required, remove the camshafts and measure the valve lifter thickness with a micrometer. Use the equation below to calculate the replacement valve lifter thickness.

    Valve lifter thickness calculation: t = t1 + (C1 - C2)
     
    t = Valve lifter thickness to be replaced
     
    t1 = Removed valve lifter thickness
     
    C1 = Measured valve clearance
     
    C2 = Specified valve clearance
     

  12.  
  13. Thickness of new valve lifters can be identified by a stamp mark inside the lifter body.

    Click image to see an enlarged view

    Fig. Valve lifter thickness (B) is marked inside the body (A). Stamp mark -302- indicates a thickness of 3.02 mm (0.1189 in.).

  14.  
  15. Install the selected valve lifters.
  16.  
  17. Install the camshafts and check valve clearance again.
  18.  
  19. Install timing chain and related parts.
  20.  
  21. Manually rotate crankshaft pulley a few rotations and check valve clearance again.
  22.  
  23. Installation of the remaining components is the reverse of removal.
  24.  

 
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