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Valve Guides

  1. Check clearance between valve guide and stem. Clearance is checked by measuring outside diameter of valve stem and inside diameter of valve guide using an outside and inside micrometer.
  2. If clearance is not as specified, replace valve guide. See CYLINDER HEAD  table under ENGINE SPECIFICATIONS. To replace valve guide, position cylinder head with combustion chamber facing upward. Insert Valve Guide Remover (499767400) into valve guide and press down to remove valve guide.
  3. Invert cylinder head and place Valve Guide Adjuster (499767700 for intake valve guide or 499767800 for exhaust valve guide) in position shown. See Fig 1. Coat NEW valve guide with engine oil. Insert Valve Guide Remover (499767400) into NEW valve guide. Press in until valve guide upper end is flush with upper surface of valve guide adjuster.
  4. Check valve guide protrusion. Valve guide protrusion should be .787-.807" (20.0-20.5 mm) for intake guide and .650-.669" (16.5-17.0 mm) for exhaust guide. Ream inside of valve guide using Valve Guide Reamer (499767400). Ensure all chips and metal particles are cleaned from valve guide. Recheck contact between valve and valve seat after replacing valve guide.
Fig 1: Positioning Valve Guide Adjuster On Cylinder Head
G00015806Courtesy of SUBARU OF AMERICA, INC.
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