Honda GX630, Workshop Manual

Page: 41 / 149

MAINTENANCE
3-9
Insert a thickness gauge between the valve rocker arm
(1) and valve stem (2) to measure the valve clearance.
Set the piston of the No.2 cylinder at the top dead
center of the cylinder compression stroke (both valves
fully closed) by rotating the flywheel (1) 270 degrees
clockwise slowly. When the No.2 piston is at the top
dead center of the compression stroke, the “T” mark (2)
on the cooling fan will align with the left side alignment
mark (3) on the fan cover.
Insert a thickness gauge between the valve rocker arm
and valve stem to measure the valve clearance.
If adjustment is necessary, proceed as follows.
Hold the tappet adjusting screw (1) and loosen the
tappet adjusting nut (2).
Turn the tappet adjusting screw to obtain the specified
clearance.
Hold the tappet adjusting screw and retighten the
tappet adjusting nut to the specified torque.
Recheck the valve clearance, and if necessary, readjust
the clearance.
Check the valve cover packing for damage or
deterioration and install it on the valve cover.
Attach the cylinder valve cover to the cylinder and
tighten the flange bolts securely.
VALVE CLEARANCE:
IN: 0.08 ± 0.02 mm
EX: 0.10 ± 0.02 mm
(2)
(1)
VALVE CLEARANCE:
IN: 0.08 ± 0.02 mm
EX: 0.10 ± 0.02 mm
TOOL:
Tappet adjusting wrench 3 mm (3) 07708-0030400
VALVE CLEARANCE:
IN: 0.08 ± 0.02 mm
EX: 0.10 ± 0.02 mm
TORQUE: 7.5 N·m (0.75 kgf·m, 5.5 lbf·ft)
(2)
(1)
(3)
270°
(2)
(1)
(3)
(1)
To decrease valve clearance: screw in.
To increase valve clearance: screw out.
(2)
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