JLG X23J - X700AJ Service Manual - Manual (Page 161)

SECTION 3 - CHASSIS & TURNTABLE
3-134 – JLG Lift – 3121448
VALVE CLEARANCE CHECK/ADJUSTMENT
Remove the head cover bolt (1), the head cover (2),and
the head cover packing (3).
Disconnect the spark plug cap from the spark plug.
Set the piston near top dead center of the cylinder com-
pression stroke (both valves fully closed) by pulling the
recoil starter slowly. When the piston is near top dead cen-
ter of the compression stroke, the triangle mark (1) on the
starter pulley (2) will align with the top hole (3) on the
recoil starter case (4).If the exhaust valve is opened, use
the recoil starter tot urn the crankshaft one additional turn
and align the triangle mark on the starter pulley with the
top hole on the recoil starter case again.
Insert a thickness gauge (1) between the valve rocker arm
(2) and valve stem (3) to measure the valve clearance.
VALVE CLEARANCE:
IN: 0.15 ± 0.02 mm
EX: 0.20 ± 0.02 mm
If adjustment is necessary, proceed as follows.
Hold the rocker arm pivot (1) and loosen the pivot adjust-
ing nut (2).
Turn the rocker arm pivot to obtain the specified clear-
ance.
VALVE CLEARANCE:
IN: 0.15 ± 0.02 mm
EX: 0.20 ± 0.02 mm
Hold the rocker arm pivot and retighten the pivot adjusting
nut to the specified torque.
TORQUE:10 N·m (1.0 kgf·m, 7 lbf·ft)
Recheck the valve clearance, and if necessary, readjust
the clearance.
Check the head cover packing for damage or deteriora-
tion, and install it to the head cover.
Attach the cylinder head cover to the cylinder head, and
tighten the head cover bolt securely.
(3) (2)
(1)
Pull slowly.
(4)
(3)
(2)
(1)
(1)
(3)
(2)