Kubota M108S, Workshop Manual

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1-S14
M108S, WSM ENGINE
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.
NOTE
■
• After adjusting, tighten the lock nut (4) securely.
W1047000
Valve clearance Factory spec.
0.23 to 0.27 mm
0.0091 to 0.010 in.
Valve arrangement
Adjustment cylinder
Location of piston
IN. EX
When No.1 piston is at
compression top dead center
1st
✩ ✩
2nd
✩
3rd
✩
4th
When No.1 piston is at
overlap position
1st
2nd
✩
3rd
✩
4th
✩ ✩
Tightening torque
Injector clamp nut
24 to 27 N·m
2.4 to 2.8 kgf·m
18 to 20 lbf·ft
Overflow pipe joint screw
(M6 x 1.0)
9.81 to 11.2 N·m
1.00 to 1.15 kgf·m
7.24 to 8.31 lbf·ft
Cylinder head cover 1
screw
6.87 to 11.2 N·m
0.700 to 1.15 kgf·m
5.07 to 8.31 lbf·ft
Cylinder head cover 2
screw
9.81 to 11.2 N·m
1.00 to 1.15 kgf·m
7.24 to 8.31 lbf·ft
Injection pipe retaining nut
23 to 36 N·m
2.3 to 3.7 kgf·m
17 to 26 lbf·ft
(1) Adjusting Screw
(2) Lock Nut (3) Adjusting Screw
(4) Lock Nut
KiSC issued 06, 2007 A