-
SERVICING
Cylinder Head
Too Clearance
1.
Remove the cylinder head (remove the cylinder head gasket
completely).
2.
Bring the piston to its top dead center fasten 1.5 mm dia. 5 to
7
mm
long fuse wires to 3 to 4 spots on the piston top with
grease so
as
to avoid the intake and exhaust valves and the
combustion chamber ports.
3. Bring the piston to its middle position, install the cylinder head,
and tighten the
cylinder head screw to specification. (Head
gasket must be changed to new one).
4. Turn the crank shaft until the piston exceeds its top dead
center.
5.
Remove the cylinder head, and measure squeezed fuse wires
for thickness.
6.
If
the
measurement is not within the specified value, check the
oil
clearance
of
the crankpin journal and the piston pin.
0.72
to
0.90
mm
Factory
0.0283
to
0.0354 in.
Top clearance
spec.
Cylinder
head
mounting
98.1
to
107.9
N·m
Tightening
torque
10.0
to
11.0
kgf·m
screw
72.3
to
79.6 ft·lbs
Cylinder Head Surface Flatness
1.
Clean the cylinder head surface.
2.
Place a straightedge on the cylinder head's four sides (A), (B),
(C)
and
(D) and two diagonal (E) and (F) as shown
in
the
figure.
Measure the clearance with a
feeler gauge.
3.
If the measurement exceeds the allowable limit, correct it with
a surface grinder.
• IMPORTANT
•
Do
not
place
the
straightedge
on
the
combustion
chamber.
•
Be
sure
to
check
the
valve
recessing
after
correcting.
Cylinder
head
surface
flatness
Cylinder Head Flaw
Allowable limit
0.05 mm
0.0020 in.
1.
Prepare an air spray red check.(Code No. 07909·31371).
2.
Clean the surface of the cylinder head with the detergent (2).
3.
Spray the cylinder head surface with the red permeative liquid
(1). Leave it five to ten minutes after spraying.
4. Wash away the red permeative
liquid on the cylinder head
surface with the detergent (2).
5.
Spray the cylinder head surface with the white developer (3).
6.
If
flawed, it can be identified
as
red marks.'
~~~WESTERBEKE
Engines & Generators
40
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