Kubota WSM STa-30, Руководство по ремонту

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1-S21
ST
α
-30 · ST
α
-35, WSM ENGINE
Valve Clearance
IMPORTANT
■
• Valve clearance must be checked and adjusted when engine
is cold.
1. Remove the head cover, the glow plugs and the timing window
cover on the clutch housing.
2. Align the “1TC” mark line on the flywheel and center of timing
window so that the No. 1 piston comes to the compression or
overlap top dead center.
3. Check the following valve clearance marked with “
✩
” using a
feeler gauge.
4. If the clearance is not within the factory specifications, adjust with
the adjusting screw.
NOTE
■
• The “TC” marking line on the flywheel is just for No. 1
cylinder. There is no “TC” marking for the other cylinders.
• No. 1 piston comes to the T.D.C. position when the “TC”
marking is aligned with center of timing window on clutch-
housing. Turn the flywheel 0.26 rad. (15 °) clockwise and
counterclockwise to see if the piston is at the compression
top dead center or the overlap position. Now referring to the
table below, readjust the valve clearance. (The piston is at
the compression top dead center when both the IN. and EX.
valves do not move; it is at the overlap position when both
the valves move.)
• Finally turn the flywheel 6.28 rad. (360 °) and align the “TC”
marking line and the center of timing window. Adjust all the
other valve clearance as required.
• After turning the flywheel counterclockwise twice or three
times, recheck the valve clearance, firmly tighten the lock
nut of the adjusting screw.
W1018974
Valve clearance Factory spec.
0.18 to 0.22 mm
0.0071 to 0.0087 in.
Condition
No. of
cylinder
IN. Valve EX. Valve
When No. 1 piston is
compression top dead center
1st
✩ ✩
2nd
✩
3rd
✩
When No. 1 piston is overlap
position
1st
2nd
✩
3rd
✩
(1) TC Mark Line
(2) Timing Window A : Valve Clearance
KiSC issued 11, 2006 A