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Home >> Toyota >> 1986 >> MR2 Automatic >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> 1.6L 4-CYL DOHC - VIN [A] >> Removal & Installation >> Valve Guide Servicing >> Clearance Check

Clearance Check

  1. Using valve guide brush and solvent, clean guides. Measure clearance between valve stem and guide with micrometer and telescopic hole gauge. Check diameter of stem at top, center and bottom. Insert hole gauge in guide bore. Measure at center.
  2. Subtract highest reading of stem diameter from guide bore to obtain clearance. Standard guide inside diameter is .2366-.2374" (6.010-6.030 mm). Maximum stem-to-guide clearance is .0031" (.080 mm) for intake and .0039" (.100 mm) for exhaust. If clearance is beyond limits and stem is not worn, replace guide.
NOTE: Replacement valve guides are available in .05 mm oversize.
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