wsm STW37 Workshop Manual page 93

STW34, STW37, STW40, WSM
Valve Clearance
IMPORTANT
• The valve clearance must be checked and adjusted when
engine is cold.
1. Remove the head cover.
2. Remove the cap of the timing window (4) on the housing under
the right step.
3. Align the "TC" mark line (3) on the flywheel and projection (2)
on the housing so that the No. 1 piston comes to compression
or overlap top dead center.
4. Check the following valve clearance (1) marked with "" using
a feeler gauge.
5. 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 top dead center position when
the "TC" marking is aligned with the projection (2) in the
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 (1). (The piston is at the top dead center when
both the IN. and EX. valves do not movie. It is at the overlap
position when both the valves move.)
• Finally turn the flywheel 6.28 rad (360 °) and align the "TC"
marking and the projection (2) perfectly. Adjust all the other
valve clearance as required.
• After turning the flywheel counterclockwise twice or three
times, recheck the valve clearance (1).
• After adjusting the valve clearance (1), firmly tighten the
lock nut of the adjusting screw.
Adjustable cylinder and location of piston
When No. 1 piston is at
compression top dead center
When No. 1 piston is at overlap
position
(1) Valve Clearance
(2) Projection
1-S14
Valve arrangement
IN.
No. 1

No. 2 –
No. 3 –
No. 1 –
No. 2

No. 3 –
(3) TC Mark Line
(4) Timing Window
9Y1211109ENS0006US0
KiSC issued 11, 2014 A
ENGINE
EX.


–
–
–
