Valve Guides Inspection; Stem-To-Guide Clearance; Valve Guides Replacement; When Using A Dial Indicator - Honda Motorcycle Service Manual

CYLINDER HEAD
Measure and record the valve stem O.D. in three places along
the valve guide sliding area.
Replace the valve with a new one if the service limit is
exceeded.
VALVE GUIDES
INSPECTION
Insert the valve guide reamer from the combustion chamber
side and ream the guide to remove any carbon build-up before
measuring the guide.
NOTE
-
Take care not to tilt or lean the reamer in the guide while
reaming.
-
If reaming is irreguler, oil will leak past the valve stem
seal. It could cause improper seat contact that cannot be
corrected by refacing.
Rotate the reamer clockwise, never counterclockwize
when inserting and removing.
I
VALVE GUIDE REAMER
Measure and record each valve guide I.D. using a ball gauge or
inside micrometer.
STEM-TO-GUIDE C L E A R A N C E
When using a dial indicator:
Measure the stem-to-guide clearance with a dial indicator
while rocking the stem in the direction of normal thrust
(wobble method).
R E P L A C E M E N T
NOTE
Refinish the valve seats whenever the valve guides are
replaced to prevent uneven seating.
Flanged Guides:
Chill the valve guides in the freezer section of a refrigerator for
about an hour.
Heat the cylinder head to 130°C-140°C 1275°F-2900F).
Do not heat the cylinder head beyond 1 50°C (300°F). Use
temperature indicator sticks, available from welding supply
stores, to be sure the cylinder head is heated to the proper
temperature.
VALVE GUIDE REMOVER
CAUTION
.
Using a torch t o heat the cylinder head may cause
warping.
combustion chamber side of the cylinder head.
Date of Issue: March, 1995
O
HONDA MOTOR CO.,LTD.