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Home >> Chevrolet >> 2015 >> Cruze LT, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 6 (Engine Mechanical - 1.8L (LUW And LWE)) >> Repair Instructions - On Vehicle >> Valve Guide Reaming and Valve and Seat Grinding >> Valve Seat Roundness Measurement Procedure

Valve Seat Roundness Measurement Procedure

WARNING: This page is about a different variant/trim than selected.
  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. Compare your measurements with the specifications, refer to Engine Mechanical Specifications .
    CAUTION: The correct size pilot must be used. Do not use adjustable diameter pilots. Adjustable pilots may damage the valve guides.
  3. If the valve seat exceeds the roundness specification, you must grind the valve and valve seat using Valve and Seat Reconditioning Procedure .
  4. If new valves are being used, the valve seat roundness must be within 0.05 mm (0.002 in).
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