MASSEY FERGUSON MF 14 - Page 75

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.