Kubota M108S Workshop Manual page 137

M108S, WSM
Checking Valve Clearance
IMPORTANT
• Valve clearance must be checked and adjusted when engine
is cold.
1. Remove the injection pipes, the cylinder head covers, overflow
pipe and injectors.
2. Align the TC mark of flywheel and the convex of flywheel housing
timing windows so that the first piston (gear case side) comes to
the compression top dead center.
3. Before adjusting the valve clearance, adjust the bridge evenly to
the valve stem.
4. Loosen the lock nut (2) and adjust with screw (1).
5. Slightly push the rocker arm by your finger and screw in the
adjusting screw slowly until you feel the screw touch the top of
valve stem, then tighten the lock nut.
6. Loosen the lock nut (4) of adjusting screw (3) (push rod side) and
insert the thickness gauge between the rocker arm and the
bridge head. Set the adjusting screw to the specified value, then
tighten the lock nut.
Valve clearance Factory spec.
NOTE
• After adjusting, tighten the lock nut (4) securely.
Valve arrangement
Adjustment cylinder
Location of piston
When No.1 piston is at
compression top dead center
When No.1 piston is at
overlap position
Injector clamp nut
Overflow pipe joint screw
(M6 x 1.0)
Cylinder head cover 1
Tightening torque
screw
Cylinder head cover 2
screw
Injection pipe retaining nut
(1) Adjusting Screw
(2) Lock Nut
1-S14
0.23 to 0.27 mm
0.0091 to 0.010 in.
IN.
1st
2nd
3rd
4th
1st
2nd
3rd
4th
24 to 27 N·m
2.4 to 2.8 kgf·m
18 to 20 lbf·ft
9.81 to 11.2 N·m
1.00 to 1.15 kgf·m
7.24 to 8.31 lbf·ft
6.87 to 11.2 N·m
0.700 to 1.15 kgf·m
5.07 to 8.31 lbf·ft
9.81 to 11.2 N·m
1.00 to 1.15 kgf·m
7.24 to 8.31 lbf·ft
23 to 36 N·m
2.3 to 3.7 kgf·m
17 to 26 lbf·ft
(3) Adjusting Screw
(4) Lock Nut
ENGINE
EX
W1047000
KiSC issued 06, 2007 A