1-S41
MX5100, WSM
ENGINE
Cylinder Head
1. Loosen the pipe clamp (2), and remove the water return pipe (1).
2. Remove the cylinder head screw in the order of (n or r) to (a).
3. Lift up the cylinder head (3) to detach.
4. Remove the cylinder head gasket (4).
(When reassembling)
• Replace the cylinder head gasket (4) with a new one.
• Tighten the cylinder head screws after applying sufficient oil.
• Tighten the cylinder head screws in diagonal sequence starting
from the center in the order of (a) to (n or r).
• Tighten them uniformly, or the head may deform in the long run.
• To replace the cylinder head gasket (4), in advance make
sure the marking (5) of cylinder head gasket in the original
engine, and replace the same marking as the original
cylinder head gasket.
• When replacing piston, piston pin, small end bushing,
connecting rod, or crankpin bearings, measure piston
head’s protrusion or recessing from the level of crankcase
cylinder face (average of all pistons) after installing the
pistons, and select the cylinder head gasket following the
below table.
Selecting the cylinder head gasket
1. Measure the piston head’s protrusion or recessing from the
crankcase cylinder face 4 spots per each piston (average of all
pistons) using the dial gauge.
2. Select the suitable cylinder need gasket refer to the table below.
W1112015
Tightening torque Cylinder head screw
93.2 to 98.0 N·m
9.50 to 10.0 kgf·m
68.8 to 72.3 lbf·ft
Gasket Marking
and Code
Number
Model
V2403-M-T
15 1G790-03600
20 1G790-03310
25 1G790-03610
30 1G790-03620
35 1G790-03630
Gasket Size
(Number)
Piston Protrusion
V2403-M-T
15 0.500 to 0.540 mm (0.0197 to 0.0212 in.)
20 0.550 to 0.590 mm (0.0217 to 0.0232 in.)
25 0.600 to 0.640 mm (0.0237 to 0.0251 in.)
30 0.650 to 0.690 mm (0.0256 to 0.0271 in.)
35 0.700 to 0.740 mm (0.0276 to 0.0291 in.)
(1) Return Pipe
(2) Pipe Clamp
(3) Cylinder Head
(4) Cylinder Head Gasket
(5) Marking
(6) Measuring Points
“n” or “r” to “a” : To Loosen
“a” to “n” or “r”: To Tighten
(A) Gear Case Side
(B) Flywheel Side
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