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Home >> Chevrolet >> 2007 >> Optra LT, Automatic >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Mechanical >> Engine Mechanical - 2.0L (L34 GMDAT) >> Repair Instructions >> Valve Guide Reaming/Valve and Seat Grinding >> Valve Guide - Ream

Valve Guide - Ream

    Fig 1: View Of KM-571-B
    GM1241258Courtesy of GENERAL MOTORS CORP.
    CAUTION: Refer to Safety Glasses Caution .
  1. Measures the diameter of the valve guide using the KM-571-B  (1) and a commercially available inside micrometer.
    2. Fig 2: View Of KM-805
    GM1241259Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Valve oversizes may already have been fitted in production.
  2. An oversize service code is on the valve guide and the valve stem end. The Valve Guide Reaming Table gives the correct size, reamer, and production code for each service code. Refer to the Valve Guide Reaming Table in Engine Mechanical Specifications  for correct size, reamer, production code, and service code for each service.
  3. Ream the valve guide with the KM-805  (1) from the upper side of the cylinder head to the next oversize.
  4. After reaming, cross out the code and emboss the valve guide with the new code.
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