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Home >> Chevrolet >> 2007 >> Optra5 LS, Standard >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Mechanical >> Engine Mechanical - 1.4L DOHC >> Repair Instructions >> Valve Guide Reaming/Valve and Seat Grinding >> Valve Seat - Cut

Valve Seat - Cut

    Fig 1: Identifying Valve Seat Angle, Upper Correction Angle, And Lower Correction Angle
    GM1241780Courtesy of GENERAL MOTORS CORP.
  1. Place the cylinder head on wooden blocks.
  2. Cut the intake and exhaust valve seats using the KM-340-7 included in the KM-340-1-C  as follows:. See Special Tools .
    • Valve seat: A 45-degree side (b) using the KM-340-13 included in the KM-340-1-C  . See Special Tools .
    • Upper correction angle: A 30-degree side (a) using the KM-340-13 included in the KM-340-1-C  . See Special Tools .
    • Lower correction angle: A 60-degree side (c) using the KM-340-26 included in the KM-340-1-C  . See Special Tools .
  3. Clean the chippings from the cylinder head.
  4. Inspect the dimensions to make sure the valve seat width is as follows:
    • Intake: 1.17-1.57 mm (0.046-0.062 in)
    • Exhaust: 1.07-1.47 mm (0.042-0.058 in)
  5. Inspect the assembly height of the intake valves and the exhaust valves.
  6. If the dimension is exceeded, install new valves.
  7. Inspect the assembly height of the intake valves and the exhaust valves again.
  8. If the valve assembly height is still too large despite replacing the valves, replace the cylinder head.
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