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Valve Guide

CAUTION: Take care not to damage the valve seat contact surface, when removing carbon adhering to the valve head. Carefully inspect the valve stem for scratches or abnormal wear. If these conditions are present, the valve and the valve guide must be replaced as a set.
  1. Measure the valve stem diameter with a micrometer. If the valve stem diameter is less than the specified limit, the valve and the valve guide must be replaced as a set.

    Diameter of Valve Stem 

    Intake 

    Standard:  5.977 mm-5.959 mm (0.2353 in-0.2346 in)

    Limit:  5.90 mm (0.2323 in)

    Exhaust 

    Standard:  5.952 mm-5.970 mm (0.2343 in-0.2350 in)

    Limit:  5.90 mm (0.2323 in)

    Fig 1: Measuring Valve Stem Diameter
    G02805215Courtesy of ISUZU MOTOR CO.
  2. Measure the inside diameter of the valve guide with a micrometer. Subtract the measured outer diameter of the valve stem from the measured inner diameter of the valve guide. If the value exceeds the specified limit, the valve and the valve guide must be replaced as a set.

    Inside Diameter of the Valve Guide 

    Inlet clearance

    Standard: 0.023 mm-0.056 mm (0.0009 in-0.0002 in)

    Limit:  0.20 mm (0.00787 in)

    Exhaust clearance 

    Standard:  0.030 mm-0.063 mm (0.0012 in-0.0025 in)

    Limit:  0.20 mm (0.00787 in)

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