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Home >> Nissan-Datsun >> 2011 >> Sentra SE-R >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Mechanical >> Engine Mechanical (MR20DE) >> Service Information >> Camshaft >> Valve Clearance >> Adjustment

Valve Clearance: Adjustment

  1. Remove camshaft. Refer to "REMOVAL AND INSTALLATION ".
  2. Remove valve lifters at the locations that are out of the standard.
  3. Measure the center thickness of the removed valve lifters with a micrometer (A).
    Fig 1: Measuring Center Thickness Of Removed Valve Lifters With Micrometer
    G04924589Courtesy of NISSAN MOTOR CO., U.S.A.
  4. Use the equation below to calculate valve lifter thickness for replacement.

    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 = Standard valve clearance: 

    Intake : 0.30 mm (0.012 in) 

    Exhaust : 0.33 mm (0.013 in) 

    • Thickness of new valve lifter (B) can be identified by stamp mark (A) on the reverse side (inside the cylinder). Stamp mark "302" indicates 3.02 mm (0.1189 in) in thickness.
      Fig 2: Identifying Stamp Mark
      G04924590Courtesy of NISSAN MOTOR CO., U.S.A.
      NOTE: Available thickness of valve lifter: 26 sizes range 3.00 to 3.50 mm (0.1181 to 0.1378 in) in steps of 0.02 mm (0.0008 in) (when manufactured at factory). Refer to "STANDARD AND LIMIT ".
  5. Install the selected valve lifter.
  6. Install camshaft. Refer to "REMOVAL AND INSTALLATION ".
  7. Install timing chain and related parts. Refer to TIMING CHAIN .
  8. Manually rotate crankshaft pulley a few rotations.
  9. Make sure that the valve clearances are within the standard.
  10. Installation of the remaining components is in the reverse order of removal.
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