FIG. A.lll/12 CHECKING SQUARENESS OF
PISTON CONNECTING RODASSEMBLY(a)AND
PARALLELISM OF A CONNECTING ROD
AXIS
(b)
G. Number
of
corresponding cylinder;
H.
Piston
top
lubrication hole; I. Liner and
piston
lubrica·
tion
hole
Lubricating oil
flows
inside a
lengthwise
passage drilled through the rod and connecting
the big and small ends.
Two small holes
are
drilled through the rod
perpendicularly to the central passage (Item
1,
Fig. A.lll/12) for the purpose
of
improving lubrica·
tion
between
cylinder
liners and
pistons.
Another oil hole (Item
H)
which is drilled through
the top
of
the small end provides a spray
of
oil
which
contributes
to
piston
cooling.
INSTALLING THE CONNECTING ROD-PISTON
ASSEMBLIES
Assemble the connecting rod and piston
units
so that the connecting rod
identification
number
corresponds
to
the number
of
the cylinder in
which
the piston is to be installed and is located
on the same side
of
class mark stamped in the
piston
(Fig. A.lll/13). Check squareness
of
the
assembly with a gauge (Fig. A.lll/12).
Make sure that
the
oil
holes
drilled
through
the
rod stem are free from debris which would en·
danger the proper lubrication
of
the
cylinder
wall.
If
so, clean them
with
a steel wire
of
suitable
diameter
and
blow
with
compressed air.
Following all preliminary checks, install the con·
necting rod-piston
unit
assemblies
into
their
respective
cylinder
liners using the
piston
ring
compressor (Fig. A.lll/11)
to
hold the rings
tight.
Make sure that the connecting rod
identification
number is on the side opposite
to
that
of
the
camshaft (Fig. A.lll/13). Secure the connecting
rod bearing caps by torque
tightening
to
the
values given in the "Torque
Specification"
table.
ENGINE FLYWHEEL
The flywheel and
its
starting ring gear cannot be
removed unless the engine
is
split
from the
transmission case. Proceed as folfows:
15158
FIG. A.lll/13 CROSS-SECTIONAL VIEW OF ONE
CONNECTING
ROD·PISTON
UNIT
WITH
ASSEMBLY REFERENCE WITH RESPECT
TO
THE CAMSHAFT
(V)
G. Number
of
corresponding cylinder;
M.lden·
tification
letter
of
the
piston
skirt dimensional
class; N. Weight
of
piston,
in grams
1.
Remove the front
cowling
and
disconnect
the battery ground cable.
2.
Remove the steering drag link.
3.
Disconnect the oil suction and delivery lines
from the hydraulic
lift
pump. Make sure
to
plug up open ends
with
work
plugs
to
prevent
oil spillage.
4.
Remove the rear hood section and the fuel
tank and
its
support as indicated on page
6.
5.
Place a shop stand under the oil sump
to
pre·
'tent the tractor front end from turning over
once free.
6.
Remove the capscrews which attach the
crankcase
to
the transmission and move
·
either
group back
or
forward so
to
allow the
transmission and P.T.O. shafts
to
come
out
of
the clutch.
7.
Remove the
clutch
by backing
out
the
capscrews
which
secure
it
to
the flywheel,
then remove
the
capscrews attaching the
flywheel
to
the
crankshaft
for
checking
or
replacing the
clutch
pilot
bearing.
When removing the flywheel be careful
with
the
clutch
push rod sleeves.
If
necessary, replace the flywheel starting ring by
preheating the new
unit
in
oil
at 176 °F.
(80
°C.)
prior
to
installation and place
it
with
the 60 o
chamfer on
the
engine side.
Engine·
28
/
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