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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 168 (Engine Mechanical - 3.6L (LGX LF4) - Repair Instructions - Off Vehicle) >> Repair Instructions - Off Vehicle >> Valve and Seat Grinding >> Valve Seat Width Measurement Procedure

Valve Seat Width Measurement Procedure

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Measuring Valve Seat Width In Cylinder Head
    GM71387Courtesy of GENERAL MOTORS COMPANY
  1. Measure the valve seat width in the cylinder head using a proper scale.
    2. Fig 2: Measuring Seat Width On Valve Face
    GM376399Courtesy of GENERAL MOTORS COMPANY
  2. Measure the seat width on the valve face (1) using a proper scale.
    3. NOTE:

    The seat contact area must be at least 0.5 mm (0.020 in) from the outer diameter (margin) of the valve. If the contact area is too close to the margins, the valve must be replaced.

  3. Compare your measurements with the specifications listed in Engine Mechanical Specifications (LF4)Engine Mechanical Specifications (LGX) .
  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 replace the valve. Proper valve seat width is critical to providing the correct amount of valve heat dissipation.
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