wsm B2420 - Page 83

ENGINE
B2420, WSM
1-S11
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
(3) cover on the clutch housing.
2. Align the "1TC" marking line (4) on the flywheel and center of
timing window so that the No. 1 piston comes to the
compression 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, loosen
the lock nut (2) and adjust with the adjusting screw (1).
5. Turn the flywheel 6.28 rad (360 °) and align the "1TC" marking
line and the center of timing window.
6. Check the remaining valve clearance in a same way.
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 line 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. 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.
• After turning the flywheel counterclockwise twice or three
times, recheck the valve clearance, firmly tighten the lock
nut of the adjusting screw.
• The sequence of cylinder numbers is given as No. 1, No. 2
and No. 3 starting from the gear case side.
9Y1210436ENS0005US0
Valve clearance "A" Factory specification
0.145 to 0.185 mm
0.00571 to 0.0728 in.
Adjustable cylinder location of
piston
Valve arrangement
IN. EX.
When No. 1 piston
comes to compression
top dead center
No. 1 ,,
No. 2 ,
No. 3 ,
When No. 1 piston
comes to overlap
position
No. 1
No. 2 ,
No. 3 ,
(1) Adjusting Screw
(2) Lock Nut
(3) Timing Window
(4) 1TC Marking Line
A: Valve Clearance
KiSC issued 06, 2012 A