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Valve Seat Width Measurement Procedure

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  1. Measure the valve seat width in the cylinder head using a proper scale.
    Fig 1: Checking Valve Seat Width
    GM71387Courtesy of GENERAL MOTORS COMPANY
  2. Measure the seat width (b) on the valve face (1) using a proper scale.
    Fig 2: Valve Face Seat Width
    GM2371864Courtesy of GENERAL MOTORS COMPANY
  3. Compare your measurements with the specifications listed in Engine Mechanical Specifications .
    NOTE: The seat contact area must be at least 0.5 mm (0.020 in) from the outer diameter, margin (a), of the valve. If the contact area is too close to the margins, the seat must be reconditioned to move the contact area away from the margin.
  4. If the seat widths are acceptable, check the valve seat roundness using the Valve Seat Roundness Measurement Procedure .
  5. If the seat width is not acceptable, you must grind the valve seat using the Valve and Seat Reconditioning Procedure  to bring the width back into specification. Proper valve seat width is critical to providing the correct amount of valve heat dissipation.
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