MASSEY-FERGUSON
GROUP
O-SECTION V-PART 7
TROUBLE
SHOOT'NG
Oil level too
high.
Breather
mechanism
damaged.
Breather
mechanism dirty.
Drain
hole in
breather box clogged.
Check oil
level -
turn
dipstick cap tightly
into re-
ceptacle for
accurate reading.
DO NOT
fill
above
full
mark.
Check reed plate
and
assembly. Replace complete
unit.
Clean
thoroughly
in
solvent. Use nerv
gaskets
when
reinstalling
unit.
Clean hole with wire
to allow oil to return to crank-
case.
Piston ring
end
gaps
aligned.
I
Rotate
end
gaps
so
they
are staggered 90' apart.
Breather
mechanism installed upside
down.
I
Small oil drain
holes
must
be down to drain oil
from
mechanism.
Breather
mechanism loose or
gaskets leaking.
Install
new
gaskets
and tighten securely.
Damaged
or worn oil seals on end of crankshaft
I
Replace
seals.
Rings not
seated
properly.
Check for worn
or
out-of-round cylinder. Replace
rings.
Break
in new rings
with engine working un-
der a varying
load.
Rings must be seated under high
compression,
or
in
other words,
under varied
load
conditions.
Replace
cover
gaskets.
Cylinder cover
gasket
leaking.
COMPRESSION
LEAK
TEST
A
quick
method to pinpoint
compression
leakage
is to
force
compressed
air into the
combustion chamber, by
means
of an
air operated
valve tool inserted in place
of
the
spark
plug.
Rotate the
engine to
T.D.C. on the compression
stroke
to
close
the
valves. Secure
the air hose adaptor into
the
spark
plug
hole.
Force approximately
60
pounds
of air
pressure
into
the combustion
chamber and listen
for
leakage
at the following
points:
l.
Through
muffier
-
indicates
leaky exhaust
valve.
2.
Carburetor
-
indicates
intake
valve
leak.
3.
Remove
oil
filler plug
and listen
at
fill
hole
-
air
leakage
at hole would
indicate worn
or
damaged
rings,
piston
or cylinder.
4.
Around
head
gasket -
this would indicate
dam-
aged
head
gasket
or
warped
head
gasket
surface.
Apply
a soapy
solution
around
the head
gasket
area. Air bub-
bling through the solution
will
pinpoint
the
leak holes
more
quickly.
COMPRESSION
TEST METHOD
Use a standard
compression
gauge
and
insert into
the spark plug
hole.
Crank engine six
to
eight
revolu-
tions.
The minimum
gauge
reading should be
60
pounds
or
more.
NOTE:
Carburetor
throttle must be
fullA
open
uhen making
compression
tests.
If reading
is low,
squirt
a
few
drops of oil into the
cylinder
and retest
the
compression. The oil will tem-
porarily
seal
leakage
around the rings
if leakage is
oc-
curring
at this point.
If
this
test shows a high
com-
pression
reading,
all indications
point to ring wear
or damage.
If
little
or no
difference in reading results,
the leak
is either
in the
valves, head
or
some
other area.
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