Valve Guide Reaming - Honda GX240RT2 Service And Repair Manual

Drive the valve guides (1) out of the cylinder head from
the combustion chamber side.
TOOL:
Valve guide driver 6.6 mm (2)
When driving the valve guides out, be careful not to
damage the cylinder head.
Remove the new valve guides from the refrigerator one
at a time as needed.
Install the new valve guides from the valve spring side
of the cylinder head.
TOOL:
Valve guide driver 6.6 mm (1)
Exhaust valve guide (2):
Drive the exhaust valve guide until the valve guide clip
(3) is fully seated as shown.
Intake valve guide (4):
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:
5 mm (0.2 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

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 6.6 mm (1) 07984-ZE2000D
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.
gx240ut2_gx270ut2_gx340ut2_gx390ut2
07942-6570100
07742-6570100
(page 12-9).
CYLINDER HEAD/VALVES
(2)
(1)
VALVE SPRING
SIDE
(1)
(4)
5 mm (0.2 in)
HANDLE
NWYTW505
(Commercially
available)
(1)
COMBUSTION
CHAMBER SIDE
(3)
(2)
COMBUSTION
CHAMBER SIDE
VALVE SPRING
SIDE