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Valve Guide Servicing

  1. In order to avoid spreading the end of the valve guide when removing it, mill the guide down to the head on the camshaft side. A 0.433" (11 mm) drill bit may be used if milling tool is not available. Drive valve guide out into combustion chamber.
  2. Using a hole gauge, measure bore in cylinder head. Turn oversize guide down in a lathe so that O.D. gives an interference fit of 0.0024 - 0.0035" (0.060 - 0.090 mm).
    Fig 1: Cross Section of Valve Guide Installed in Head
    G09332241Courtesy of PORSCHE CARS NORTH AMERICA, INC.

    Use lubricant when installing guides. 

  3. Press valve guide into head from camshaft side until a measurement of 0.5196" (13.200 mm) is reached. See Fig 1. Use grease as a lubricant when pressing in valve guides. Bore or ream valve guide I.D. to 0.3543 - 0.3549" (8.990 - 9.010 mm).
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