MASSEY FERGUSON MF 14 - Page 48

GROUP
O
MASSEY-FERGUSON
SECTIONV-PART3
ENGINE OYERHAUI
PROCEDURES
I
t-
TOP PISTON
LAND
CLEARANCE
. o20"
-
030"
3rd
2nd
Compression
Ring
Oil Control
Ring
RING
CENTERED
IN RING
TRAVEL
AREA
INVERTED PISTON
TO POSITION RING
SQUARELY IN
CYLINDER
CIIECK RII{G
END
GAP
Fie. l4
Fis. 12
3.
Check
piston
diameter
on
the
top
of
lhe
skirt,
just
below
the
oil
r'ing
groove.
Check at
90o
to
center
line of wrist
pin
hole
as
shown
in
Fig. 13.
This is
a
cam
ground
piston
and the
diameter
will
not be the same when
checked
at
another
point.
Pistons
and
rings
are available
in
either
.010" or
.020"
oversize.
4.
Before installing the rings,
insert each
ring
into the cylinder bore to
check
the
endgap.
NOTE: Tltis
gap
check sltoukl be
urude
in a tt)ot'n
cJ,littcler, u
recoutlitiotrcd
cJ,littclet' ctnd tt
nett: c),litule r.
An inverted
piston
should be used
to
push
the
ring into the
cvlinder
to
a
point
that would be
the center of
ring
travel. The
ring travel
area
will be the most
worn area
in
a
used cylinder.
Insert the
piston
ring into the cylinder andplace
the top side
of
the
piston
onto
the ring to
posi-
tion the ring squarely in the bore. Measure the
end
gap
by
inserting
a
feeler
gauge
between the
ring ends
as shown
in Fig. 14.
Check
each
ring
using the
same
procedure.
The
end
gap
dimension is
.010"-.020".
If
end
gap
is
greater
than
.020",
then the cylinder
rnust
be measured
and
perhaps
bored over-
CTIECK
PISTON
DiAMETER
T
TIIIS
SEE SPECIFICATION
SECTION FOR DI}T'ENSIONS
POINT
INSIDE CFIAMFER
TO PISTON TOP
UNDER
CUT DOWN
EXPANDER
LOCATED
EITHER
BEHIND THE
SECOND
COMPRESSION
RING
OR
BEHIND THE
OIL
CONTROL
RING
Pr
nied'n
U.S.A.
Fis. l3 Fie.
I5