ENGINE
WG972-E4, WSM
1-S15
Adjusting the Valve Clearance
• The valve clearance must be checked and adjusted when
engine is cold.
1. Remove the cylinder head cover and the spark plugs.
2. Align the "1TC" mark (1) on the flywheel and alignment mark (2)
on the rear end plate 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, adjust
with the adjusting screw.
5. Then turn the flywheel 6.28 rad (360 °), and align the "1TC"
mark (1) on the flywheel and alignment mark (2) on the rear end
plate so that the No. 1 piston comes to the overlap position.
6. Check the following valve clearance marked with "" using a
feeler gauge.
7. If the clearance is not within the factory specifications, adjust
with the adjusting screw.
: When No. 1 piston is at the compression top dead center position.
: When No. 1 piston is at the overlap position.
• The sequence of cylinder numbers is given as No. 1, No. 2
and No. 3 starting from the gear case side.
• After adjusting the valve clearance, secure the adjusting
screw with the lock nut.
9Y1211108ENS0008US0
Adjustable Cylinder Location
of Piston
Valve Arrangement
Intake valve Exhaust valve
No. 1
No. 2
No. 3
Intake and exhaust valve
clearance (cold)
Factory specification
0.145 to 0.185 mm
0.00571 to 0.00728 in.
(1) "1TC" Mark
(2) Alignment Mark
A: Gear Case Side
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