GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2005 🢒 Optra 🢒 Engine 🢒 Engine Mechanical - 1.8L (L79) 🢒 Valve Rocker Arm and Shaft Cleaning and Inspection

Inspection Procedure

    Object Number: 1289877 Size: SH
  1. Inspect the valve stem tip for wear.
  2. Inspect the valve key grooves and the oil seal grooves for chips and wear.
  3. Inspect the valves for burns or cracks.
  4. Inspect the valve stem for burrs and scratches.
  5. Inspect the valve stem. The valve stem must be straight.
  6. Inspect the valve face for grooving. If the groove is so deep that refacing the valve would result in a sharp edge, replace the valve.
  7. Inspect the valve spring. If the valve spring ends are not parallel, replace the valve spring.
  8. Inspect the valve spring seating surface of the valve rotators for wear or gouges. Replace as required.

Cleaning Procedure

    Caution: Refer to Safety Glasses Caution in the Preface section.


    Object Number: 1289879 Size: SH
  1. Clean the cylinder head.
  2. Clean the valve guides.
  3. Clean all of the threaded holes.
  4. Clean the valves of carbon, oil, and varnish.