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Valve Guide Clearance

WARNING: This page is about a different car, the 2003 Nissan Altima. However, it is still accessible from the selected car via links, so may be relevant.
  1. Measure valve deflection as shown in the figure. (Valve and valve guide mostly wear in this direction.)
    1. Valve deflection limit (dial gauge reading) 
    2. Intake : 0.24 mm (0.0094 in) 
    3. Exhaust : 0.28 mm (0.0110 in) 
    Fig 1: Checking Valve Deflection
    G02110708Courtesy of NISSAN MOTOR CO., U.S.A.
  2. If it exceeds the limit, check valve to valve guide clearance.
    1. Measure valve stem diameter and valve guide inner diameter.
    2. Check that clearance is within specification.
      1. Valve to valve guide clearance limit 
      2. Intake : 0.08 mm (0.0031 in) 
      3. Exhaust : 0.1 mm (0.004 in) 
    3. If it exceeds the limit, replace valve or valve guide.
    Fig 2: Checking Valve Guide Clearance
    G02110709Courtesy of NISSAN MOTOR CO., U.S.A.
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