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Valve Guide Servicing

  1. If valve-to-guide clearance is excessive, drive out guide toward combustion chamber side of head. Check size of valve guide bore in cylinder head. Valve guide bore diameter should be the same as guide outside diameter.
  2. Valve guides are available in 3 oversizes. Oversize diameters are 13.1, 13.2 and 13.3 mm. When installing valve guides, heat cylinder head to 122°F (50°C) and chill valve guide to -238°F (-150°C). Replacement oversize valve seats are available in .0078" (.2 mm) and .016" (.4 mm) outside diameters. See VALVE SEAT DIAMETER  table.
  3. Drive guide into cylinder head from top. Stepped end of valve guide must face camshaft. Guide must protrude .551-.591" (14.0-15.0 mm) from top of head. Ream valve guide for correct oil clearance.
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