ENGINE
STW34, STW37, STW40, WSM
1-S13
Top Clearance
1. Remove the cylinder head.
2. Move the piston and stick a strip of fuse on the piston head at
three positions with grease.
3. Lower the piston and install the cylinder head. (Use a new
cylinder head gasket and tighten with a specified tightening
torque.)
4. Turn the flywheel until the piston passes through the T.D.C..
5. Remove the cylinder head and measure the thickness of the
fuses.
6. If the measurement is not within the factory specifications,
check the oil clearance between the crankpin and bearing and
between the piston pin and bushing.
• After checking the top clearance, be sure to assemble the
cylinder head with a new cylinder head gasket.
9Y1211109ENS0005US0
Top clearance Factory specification
0.55 to 0.70 mm
0.022 to 0.027 in.
Tightening torque Cylinder head screws
93.2 to 98.0 N·m
9.50 to 10.0 kgf·m
68.8 to 72.3 lbf·ft
(1) Piston (2) Fuse
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