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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 356 (ENGINE MECHANICAL - 2.2L)REMOVAL AND INSTALLATIONUNIT REPAIR CLEANING, INSPECTION, AND SELECTIONCYLINDER HEAD CLEAN AND INSPECT (UNIT REPAIR)
1999 GMC Forward Control 5.7 R, Automatic

Cylinder Head Clean And Inspect (Unit Repair)

1999 GMC Forward Control 5.7 R, AutomaticSECTION Cylinder Head Clean And Inspect (Unit Repair)
WARNING: This page is about a different car, the 2003 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

IMPORTANT:  Do not scratch the valve stem with the wire brush.

  1. Clean valves of carbon, oil and varnish. Carbon can be removed with a wire brush, varnish can be removed by soaking in Parts Immersion Solvent (or equivalent).
  2. Clean valve guides.
  3. Inspect valve stem for wear. The valve stem end may be reconditioned by grinding.
  4. Follow grinder manufacturer's instructions. Ensure the new surface is perpendicular to valve stem.
  5. Inspect valve keeper groove for chipping or wear. Replace valve if chipped or worn.
    Fig 1: Removing/Cleaning Valves
    G01039588Courtesy of GENERAL MOTORS CORP.
  6. Inspect valve face for burning or cracking. If pieces are broken off, inspect corresponding piston and cylinder head area for damage.
  7. Inspect valve stem for burrs and scratches. Burrs and minor scratches may be removed with an oil stone.
  8. Using V blocks inspect valve stem for straightness and the valve head for bending or distortion. Bent or distorted valves must be replaced.
  9. Clean all deposits from valve face. Inspect valve face for grooving.
  10. Replace valve if the face is grooved.
    Fig 2: Inspecting Valves
    G01039589Courtesy of GENERAL MOTORS CORP.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.