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Home >> GMC >> 2018 >> Terrain Denali, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 3 (Engine Mechanical - 1.6L (LH7) Diesel) >> Repair Instructions - Off Vehicle >> Cylinder Head Cleaning And Inspection >> Valve Inspection And Measurement

Valve Inspection And Measurement

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    Fig 1: Valve Inspection And Measurement
    GM2189690Courtesy of GENERAL MOTORS COMPANY
  1. Clean the valves of carbon and oil. Carbon can be removed with a wire brush.
  2. Inspect the valves for the following conditions:
    1. Inspect the valve faces for burning and cracking (1). If pieces are broken, replace the valve and inspect the corresponding piston and cylinder head area for damage.
    2. Inspect the valve for straightness and distortion (2). Distorted valve must be replaced.
    3. Inspect the valve stem for wear (3).
    4. Inspect the valve key grooves for chipping and wear (4) and (5). Replace the valve if chipped or worn.
    3. Fig 2: Measuring Valve Length Using Slide Gauge
    GM2189668Courtesy of GENERAL MOTORS COMPANY
  3. Measure the valve length (2). Use a slide gauge (1). Refer to Engine Mechanical Specifications  to find the permitted values.
    4. Fig 3: Measuring Valve Stem Diameter Using Micrometer Gauge
    GM2189667Courtesy of GENERAL MOTORS COMPANY
  4. Measure the valve stem diameter. Use a micrometer gauge (2). Refer to Engine Mechanical Specifications  to find the permitted values. Note the measurement results.
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