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MASSEY.FERGUSON
GROUP
O-SECTION V_PART
8
EA'G,,VE
OV ERH
AUL PROCEDURES
f.
Check
piston
pin for
scoring or wear.
If
piston
pin
is
scored
or
worn
to
less
than
dimension limits,
replace
piston
and
pin
assembly.
NOTE:
The
piston
pin
can be replaced
onlg
in rnatched pairs.
lf
either
is nsorn
or damaged,
both must
be
replaced.
g.
Insert piston
pin in
piston and check for play.
If
excessive
play
exists,
replace
piston
and
pin.
h.
Check connecting
rod
bearing
for wear
and
scor-
ing.
Check
bearing on piston end
of
rod
by
in-
serting
piston pin
in
bearing.
It
should
be a
snug
fit.
Check diameter of crankshaft end
of rod by in-
stalling rod cap and
securely
tightening nuts. The
match marks
(Fig. 8), on connecting rod and
cap
PISTON AND
ROD
ASSEMSI.Y
CONNECIING
ROD
MATCHING
MARKS
Fig.
8
must
be
properly aligned.
Internal diameter
should
be within limits
indicated
in
"Specifications".
Visually check connecting rod shank
for
signs
of
cracking or distortion.
If
connecting rod
is
worn or
damaged,
replace connecting
rod and
cap.
9. To
install piston, piston rings and connecting rod,
position piston
(Fig.
8),
on connecting rod. Coat piston
pin with oil
and insert piston
pin into piston
and rod,
securing
in
place
by installing
a
retaining ring at
each
end.
10.
Install piston rings on piston.
Stagger
ring
gaps
around
piston
to
prevent compression
loss.
Printed
in
U.S.A.
ll.
Before
using new rings
in
a
cylinder that
has
not
been rebored,
wipe cylinder wall with fine
emery
cloth
to
break glaze. This
will
aid proper
seating
of
rings.
Clean
inside of cylinder
wall
thoroughly
with
solvent
and
allow to dry.
12. Coat inside
of cylinder wall with
oil
to facilitate
insertion
of
piston and
ring
assembly.
This
insures
lubrication when starting engine after overhaul.
13. Use a
ring
compression
tool for
easy
insertion
of
piston in cylinder.
14.
Coat connecting rod journal
with oil
and
posi-
tion end of
connecting
rod on
connecting
rod journal
of
crankshaft.
Position rod cap on connecting rod
so
that match marks on rod and cap are aligned (Fig.
8).
Secure
rod and cap
to
journal with two bolts,
washers,
and
new self-locking
nuts.
NO?ES:
Use
neus
self-Iocking nuts each time
connecting
rod
is
installed.
15.
Tighten connecting rod nuts
securely
and evenly
(refer to "Specifications" for
proper tension).
16.
Install
camshaft,
making
sure
match marks
on
crankshaft
gear and camshaft gear
are
aligned
(Fig.
5).
17.
Install cylinder
head, tightening head bolts in
the
sequence
shown
in
Fig. 9. Tighten bolts to torque
indicated in "specifications".
CYLINDER
l.
Remove
magneto.
2.
Remove
valves as described
in
Step
No.
I
of
"Valves-Grinding And
Replacement".
3.
Remove
the camshaft and crankshaft
as
described
in
Steps
I
through
4
of
"Camshaft
And Crankshaft".
4.
Remove
piston
assembly as
described
in
Steps
I
through
5
of
"Piston, Piston Rings
And
Connecting
Rod".
5.
Remove
the
carburetor and the governor
assembly.
6. Clean entire cylinder and cylinder head with
solvent.
Make sure main bearing
oil
passage
is
open
by
blowing
a
stream
of
clean,
dry
compressed air
through
it.
Clean
all dirt from
cooling fins. Remove
all
carbon
deposits
from cylinder
head.
7. Inspect cylinder
for
cracks, stripped
bolt
hole
threads,
broken fins,
or
scored
cylinder walls.
Replace
cylinder
if
damaged.
B.
With an
accurate
micrometer
or dial
indicator,
check inside diameter
of
cylinder bore. Refer
to
"Specifications"
for standard bore
sizes.
If
bore is more
than
.005-inch oversize,
rebore and install
oversized
piston and rings. Refer
to
"Reboring
the
Cylinder".
9. Check main bearings
for
scoring and wear.
If
bearings
are scored
or worn to
less
than limits indi-
cated
in "Specifications", replace cylinder.
10. Check
cylinder
camshaft
bearings
for
scoring or
wear.
If
bearings are scored
or
worn to
less
than
limits
indicated in "specifications", replace the cylinder.
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