Honda WB20XT2 Manual page 108

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WB20XT2•WB30XT2
Remove the heated cylinder head from the hot plate
and support it with wooden blocks.
Drive the valve guides (1) out of the cylinder head from
the combustion chamber side.
TOOL:
Valve guide driver 5.5 mm (2)
When driving the valve guides out, be careful not to
damage the cylinder head.
Remove the new valve guides (1) from the refrigerator
one at a time as needed.
Install the valve guides from the valve spring side of the
cylinder head.
TOOL:
Valve guide driver 5.5 mm (2)
Drive the exhaust valve guide until new valve guide clip
(3) is fully seated as shown.
Drive the intake valve guide to the specified height
(measured from the end of the valve guide to the
cylinder head as shown).
IN VALVE INSTALLATION HEIGHT:
4.8 – 5.2 mm (0.19 – 0.20 in)
After installing the valve guide, check the guide for
damage.
Replace the valve guide if damaged.
Let the cylinder head cool to room temperature.
Ream the valve guide (page 12-9).
VALVE GUIDE REAMING
For best results, be sure the cylinder head is at room
temperature before reaming valve guides.
Coat the reamer and valve guide with cutting oil.
TOOL:
Valve guide reamer 5.510 mm (1) 07984-2000001
Rotate the reamer clockwise through the valve guide
the full length of the reamer.
• Turn the special tool (valve guide reamer) clockwise,
never counterclockwise.
• Continue to rotate the special tool while removing it
from the valve guide.
Thoroughly clean the cylinder head to remove any
cutting residue.
07742-0010100
IN:
07742-0010100
COMBUSTION
CHAMBER SIDE
VALVE SPRING SIDE
CYLINDER HEAD
(2) EX:
(3)
(1)
HANDLE
(Commercially
available)
12-9
(2)
(1)
(1)