Valve Guide Replacement - Honda 2005-2008 RX500 FA Service Manual

'61HN252' by American Honda Motor Co. - Page 174 of 540
[2005-2008] [TRX500 FA/FGA]
CYLINDER HEAD/VALVE/CAMSHAFT
Inspect and reface
the valve seats
whenever the valve
guides are replaced
(page 8-14).

VALVE GUIDE REPLACEMENT

Be sure to wear
heavy gloves to
avoid burns when
handling the heated
cylinder head.
Using a torch to
heat the cylinder
head may cause
warpage.
Take care not to tilt
or lean the reamer
in the guide while
reaming.
8-12
1 of 1
Subtract each valve stem O.D. from the correspond-
ing guide I.D. to obtain the stem-to-guide clearance.
SERVICE LIMITS: IN: 0.12 mm (0.005 in)
EX: 0.14 mm (0.006 in)
If the stem-to-guide clearance exceeds the service
limit, determine if a new guide with standard
dimensions would bring the clearance within toler-
ance.
If so, replace any guides as necessary and ream to
fit.
If the stem-to-guide clearance exceeds the service
limit with a new guide, also replace the valve.
Chill new valve guides in the freezer section of a
refrigerator for about an hour.
Heat the cylinder head to 130--140°C (275--290°F)
with a hot plate or oven. Do not heat the cylinder
head beyond 150°C (300°F). Use temperature indica-
tor sticks, available from welding supply stores, to
be sure the cylinder head is heated to the proper
temperature.
Support the cylinder head and drive the valve
guides out of the cylinder head from the combus-
tion chamber side.
TOOL:
Valve guide driver, 5.5 mm 07742-0010100
While the cylinder head is still heated, drive new
valve guides in the cylinder head from the rocker
arm side using the same tool until the exposed
height is specified value.
VALVE GUIDE PROJECTION:
IN: 15.8-16.2 mm (0.62-0.64 in)
EX: 18.8-19.2 mm (0.74-0.76 in)
Let the cylinder head cool to room temperature.
Ream the new valve guides.
Insert the reamer from the combustion chamber
side of the head and always rotate the reamer clock-
wise.
TOOL:
Valve guide reamer, 5.5 mm 07984-2000001 or
07984-200000D
(U.S.A. only)
Use cutting oil on the reamer during this operation.
Clean the cylinder head thoroughly to remove any
metal particles after reaming and reface the valve
seat (page 8-14).
http://services.honda.com/ServiceManual/SVC_MNL/61HN253/61HN2...
VALVE GUIDE DRIVER
VALVE GUIDE DRIVER
REAMER
VALVE GUIDE
3/9/2008 10:50 PM