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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 - Off Vehicle >> Cylinder Head Cleaning and Inspection >> Valve Cleaning and Inspection

Valve Cleaning and Inspection

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  1. Clean the valves of carbon, oil and varnish. Carbon can be removed with a wire brush. Varnish can be removed by soaking in Parts Immersion Solvent.
    Fig 1: Identifying Inspection Points For Valves Damage
    GM156174Courtesy of GENERAL MOTORS COMPANY
    WARNING: Bodily injury may occur if the cleaning solvent is inhaled or exposed to the skin.
    NOTE: Do not scratch the valve stem with the wire brush.
  2. Clean the valve guides.
  3. Inspect the valve stem for wear (4).
  4. Inspect the valve key groove for chipping or wear (5). Replace the valve if chipped or worn.
  5. Inspect the valve face for burning or cracking (1). If pieces are broken off, inspect the corresponding piston and cylinder head area for damage.
  6. Inspect the valve stem for burrs and scratches. Burrs and minor scratches may be removed with an oil stone.
  7. Inspect the valve stem for straightness and the valve head for bending or distortion (3) using V blocks. Bent or distorted valves must be replaced.
  8. Clean the deposits from the valve face. Inspect the valve face for grooving.
  9. Replace the valve if the face is grooved. Valve faces cannot be machined. If worn or damaged, the valves must be replaced.
  10. The valves may be lightly lapped to the valve seats.
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