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Home >> Chevrolet >> 2007 >> Optra5 LS, Standard >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Mechanical >> Engine Mechanical - 2.0L (L34 GMDAT) >> 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.
    CAUTION: Refer to Safety Glasses Caution .
  1. Place the cylinder head on wooden blocks.
  2. Cut the intake and the exhaust valve seats using the KM-340-7 as follows.

    Specifications: 

    • Cut the valve seat to a 45 degree surface (b) with the KM-340-13.
    • Cut the upper correction angle to a 30 degree surface (a) with the KM-340-13.
    • Cut lower correction angle to a 60 degree surface (c) with the KM-340-26.

  3. Clean the chippings from the cylinder head.
  4. Inspect the dimension for the valve seat width.

    Specifications: 

    • The intake valve seat width is 1.2-1.4 mm (0.47-0055 in).
    • The exhaust valve seat width is 1.4-1.8 mm (0.055-0.070 in).

  5. Inspect the assembly height of the intake valves and the exhaust valves. If the specified dimension is exceeded, install new valves. Inspect the assembly height of the intake valves and the exhaust valves again. If the valve assembly height is still too large despite replacing the valves, replace the cylinder head.
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