Service Manual

Valve Stem and Valve Guide Clearance:
Refer to Figures 11-4 and 11-5. Remove carbon
from valve guide and valve stem. Measure the valve
stem outside diameter at
six positions. Measure the
valve guide inside diameter at three positions. Cal-
culate the clearance.
If the clearance is not as
specified in Dimensions and Clearances, replace
the valve.
If clearance still exceeds the allowable
limit, replace the valve guide.
FIGURE 114. MEASURING VALVE STEM
VALVE GUIDE
FIGURE 11-5. MEASURING VALVE GUIDE
Valve Guide Replacement:
CAUTION Driving out old valve guides can
cause guide and guide
bore damage. Do not
strike guide or guide
bores wlth driver during
removal.
Refer to Figure 11-6. Press out the used valve guide
using a special valve guide replacing tool. Apply
engine oil to a new valve guide. Install a
stopper ring
to the valve guide. Press the new valve guide in until
the stopper ring contacts the cylinder head. Ream
the new guide to achieve the specified stem to
guide clearance.
STOPPER RING
11-5