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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 Roundness Measurement Procedure

Valve Seat Roundness 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.
  1. Measure the valve seat roundness using a dial indicator attached to a tapered pilot installed in the guide. The pilot should have a slight bind when installed in the guide.
    2. CAUTION:

    The correct size pilot must be used. Do not use adjustable diameter pilots. Adjustable pilots may damage the valve guides.

  2. Compare your measurements with the specifications listed in Engine Mechanical Specifications (LF4)Engine Mechanical Specifications (LGX) .
  3. If the valve seat exceeds the roundness specification, you must replace the valve.
  4. If new valves are being used, the valve seat roundness must be within 0.05 mm (0.002 in).
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