Valve Guide Replacement - Honda TRX400EX FOURTRAX 1999 Service Manual

CYLINDER HEAD/VALVE

VALVE GUIDE REPLACEMENT

Chill new valve guides in the freezer section of
refrigerator for about an hour.
Heat the cylinder head to 130
with hot plate or oven. Do not heat the cylinder
a
head beyond 150" (300°F). Use temperature indicator
sticks, available from welding supply stores, to be
sure the cylinder head is heated to the proper tem-
perature.
Wear heavy gloves to avoid burns when handling
the heated cy1;nder head.
CAUTION:
Using a torch to heat the cylinder head may cause
Support the cylinder head and drive the valve guides
out of the cylinder head from the combustion cham-
ber side.
TOOL
Valve guide driver, 5.5 mm
Install new O-rings onto the new valve guides.
Drive the new valve guides in the cylinder head from
the camshaft side while the cylinder head is still heated.
TOOL
Valve guide driver, 5.5 mm
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 clockwise.
TOOL
Valve guide reamer, 5.5 mm
NOTE:
Take care not to tilt or lean the reamer in the guide
while reaming.
Use cutting oil on the reamer during this opera-
tion.
Clean the cylinder head thoroughly to remove any
metal particles after reaming and reface the valve
seat (page 7-14).
7-1
2
a
-
- 140°C (275 290°F)
07742- 0010100
07742-0010100
VALVE GUIDE REAMER'
-
07984 2000001 or
-
07984
ALV
O-RING'
\
RIVER