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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 199 (Engine Mechanical - 3.6L (LF4) - Repair Instructions (4 Of 4)) >> Repair Instructions >> Valve and Seat Grinding >> Valve Seat Width Measurement Procedure

Valve Seat Width Measurement Procedure

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
  1. GM71387

    Measure the valve seat width in the cylinder head using a proper scale.

  2. GM376399

    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 .
  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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