Valve Clearance Adjustment
CAUTION:
Valve clearance adjustment must be performed when cylinder head, rocker arm guide, shim, valve or valve seats are replaced.
- With camshafts and rocker arms removed, remove lash adjuster and shim. See Fig 1 . Install dial indicator on Dial Indicator Stand(J-38957). See Fig 2 .
- Install dial indicator assembly in lash adjuster hole in cylinder head. See Fig 3 . Position dial indicator stem on sliding surface of rocker arm guide. Lightly pull dial indicator rod toward outside of cylinder head to eliminate excessive movement in dial indicator stand, and note dial indicator reading.
- Remove dial indicator assembly, and install it in other lash adjuster hole. Position dial indicator stem on valve stem. See Fig 3 . Lightly pull dial indicator rod toward outside of cylinder head, and note dial indicator reading.
- Determine difference between height of sliding surface on rocker arm guide and valve stem. See Fig 3 . Select a replacement shim with thickness within .001" (.30 mm) of difference.
- For example, if difference reading was .120" (3.05 mm), select a shim with .119-.121" (3.02-3.07 mm) thickness. Replacement shims are available in thicknesses ranging from .1102-.1260" (2.799-3.200 mm) in increments of .001" (.30 mm). Install shim and remaining components in original locations.