14-33
dummyheaddummyhead
CYLINDER HEAD
VALVE LENGTH/VALVE O.D.
Measure the overall length and the O.D. of the valve.
Overall length
Valve O.D.
If the measurement is less than the standard, replace
the valve with a new one.
VALVE GUIDE I.D.
Using the valve guide reamer (special tool), ream the
valve guides to remove any carbon deposits before
measuring.
• Turn the special tool clockwise, never turn it
counterclockwise. Continue to turn it clockwise as
you lift it from the valve guide.
Measure and record each valve guide I.D.
If the measurement exceeds the service limit, replace
the valve guide with a new one.
• Check the valve stem-to-valve guide clearance after
replacing the valve guide.
VALVE STEM-TO-VALVE GUIDE
CLEARANCE
Calculate the gap between the valve stem O.D. and the
valve guide I.D.
If the stem-to-guide clearance exceeds the service limit,
replace the valve guide with a new one (page 14-40).
If the stem-to-guide clearance exceeds the service limit
with new guides, replace the valves as well.
• Recondition the valve seats whenever the valve
guides are replaced (page 14-41).
STANDARD:
IN: 118.55 – 119.15 mm (4.667 – 4.691 in)
EX: 117.25 – 117.85 mm (4.616 – 4.640 in)
STANDARD:
IN: 27.85 – 28.15 mm (1.096 – 1.108 in)
EX: 22.85 – 23.15 mm (0.900 – 0.911 in)
TOOL:
Valve guide reamer, 5.5 mm [1] 07HAH-PJ7A100
STANDARD:
IN/EX: 5.51 – 5.53 mm (0.217 – 0.218 in)
SERVICE LIMIT:
IN/EX: 5.55 mm (0.219 in)
STANDARD:
IN: 0.020 – 0.050 mm (0.0008 – 0.0020 in)
EX: 0.050 – 0.080 mm (0.0020 – 0.0032 in)
SERVICE LIMIT:
IN: 0.080 mm (0.0032 in)
EX: 0.110 mm (0.0043 in)
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