DISASSEMBLY
I
ASSEMBLY
Pistons
1.
Turn the flywheel and set a piston
to
the top dead center.
2. Pull out the piston upward by lightly tapping it
from
the
bottom
of the crankcase with the grip of a hammer.
(When reassembling)
• Before inserting the piston into the cylinder, apply enough
engine oil to the cylinder.
• When inserting the piston into the cylinder, face
the
mark
on
the connecting rod
to
the injection pump .
•
IMPORTANT
• Do
not
change
the
combination
of
cylinder and piston.
Make
sure
of
the
position
of
each
piston
by
marking. For
example,
mark
"1"
on
the
No.1
position.
• When
inserting
the
piston
into
the cylinder, place the gap
of
the
compression
ring 1
on
the
opposite side
of
the
combustion
chamber and stagger the gaps
of
the
compression
ring
2 and
oil
ring marking a right angle
from
the
gap
of
the
compression ring 1.
•
Carefully
insert
the.
pistons
using
a piston ring
compressor
(1). Otherwise,
their
chrome-plated section
may
be
scratched, causing
trouble
inside the liner.
Piston Ring
and
Connecting
Rod
1.
Remove the piston rings using a piston ring tool.
2.
Put the
fan
shaped concave
(8)
on
the piston
as
shown.
3.
Remove the piston
pin
(1),
and
separate the connecting
rod
(7)
from
the
piston.
(When reassembling)
• Be sure to fix the crankpin bearing and the connecting
rod
are
same I.D. colors.
• When. installing the ring, assemble the rings sa that the
manufacture's mark
(12)
near the gap faces the top of the
piston.
• When installing
the
oil
ring onto the piston, place the expander
joint (10)
on
the
opposite side of the oil ring
gap.
• Apply engine
oil
to
the piston
pin.
• When installing the piston
pin,
immerse the piston
in
80°C
(176
of)
oil
for
10
to 15 minutes and insert the piston
pin
to the
piston.
(6)
(A)
(8)
Second
Rlnl!l
(C)
011
Ring Gap
(D)
Piston
Pin Hole
,
CONCAVE
(e)
(a) 0.79 red. (45 j
(B)~
• Assemble
the
piston to the connecting rod with
the
aligning the
(A)
Connecting Rod
1.0.
Color:
/
direction of
the
fan
shaped concave
(8)
of piston head and the Blue
or
without
color 0
mark
(9)
of
connecting
rod.
(B) Crankpin Bearing
1.0.
Color:
'
• The end faces of the oil ring
are
plated with hard chrome.
In
Blue
or
without
cOlor~-
Oil
RING
putting the piston into
the
cylinder,
be
careful not to get the
oil
.
/GAP
ring scratched by the cylinder.
Use
the piston ring fitter to
~~r:n~~
y -
tighten up the oil ring.
If
the ring's planting is scratched, it may
~
t t
k
th
I
· d
II
. . t
bl
MARK
THE
SAME
NUMBER
ON
ge
s uc
on
e
cy
In
er
wa
,causing a serious
rou
e.
THE
CONNECTING
ROD
AS
THE
.
PISTON
SO
AS
NOT
TO
CHANGE
THE
COMBINATION
-..y:
WESTERBEKE
. Engines & Generators
30
MTGS.
MAR
(12)
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