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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 Width Measurement Procedure

Valve Seat Width Measurement Procedure

WARNING: This page is about a different variant/trim than selected.
  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 on the valve face (1) using a proper scale.
    Fig 2: Measuring Seat Width On Valve Face
    GM376399Courtesy of GENERAL MOTORS COMPANY
  3. Compare your measurements with the specifications, refer to Engine Mechanical Specifications .
    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 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 Valve Seat Roundness Measurement Procedure .
  5. If the seat width is not acceptable, you must grind the valve seat using 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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