MASSEY FERGUSON MF 14 - Page 91

MASSEY.FERGUSON
TECUMSEH
EA'G'A'ES
MODEL
H7O
GROUP
O-SECTION
V-PART
10
installed
with the
flat surface toward the
bottom of
the
carburetor
as shown in
Fig.
2.
(Hold
the
choke
shaft
tightly
against
the bearing bore to prevent
binding
and excessive
choke
plate
wear.)
IDLE ADJUSTMENT
SCREW
The idle
screw,
Fig. 3, is a thick,
blunt,
tapered
needle.
Remove the idle needle
from the carburetor
and examine
the point
for damage to the
seating
sur-
face on
the taper.
If damaged, it
must
be replaced.
Fig. 3
To adjust
the idle
speed, screw the
adjustrnent
screw
in
until it
bottoms
against the seat.
Back off one
full
turn.
Make
final
adjustment after
engine
reaches its
normal
operating
temperature.
HIGH
SPEED
ADJUSTMENT
SCREW
The high
speed
adjustment screw, Fig. 3, should be
inspected
for
damage to the
seating surface on
the
taper.
If damaged,
replace the screw
and fuel
bowl
retainer
nut
as an assembly.
(The
retainer nut
contains
the
seat for
the
adjustment screw.)
Tighten fuel
bowl
nut
to 50-60
in.-lbs.
torque.
Upon reassembly
of
the
high speed adjustment
screw, position
the coil
spring onto the screw, followed
by the small
brass washer and the
"O"-ring.
To adjust
the
high speed, turn the
adjustment screw
in
until it
bottoms
against the seat.
Back off one full
turn,
FUEL
BOWL
In the
event
the fuel bowl
drain, Fig. 3, has shown
signs
of leaking,
replace
the rubber
gasket
on the in-
side of
the
drain
valve.
Inspect
the
"O"-ring
that seals
the fuel
bowl
to the
carburetor
main
body for
damage.
When
assembling
the fuel bowl to
the main body,
moisten
the
"O"-ring
with water
or a
very small amount
of
fuel
or oil.
This will
allow the fuel bowl to seat
properly.
2
NOTE: The
flat
surface of the base
of the
fuel
bowl must be on
the same si,de
of
the
carburetor
as
the
fuel
inletfitting.
FLOAT
Examine
the float,
Fig. 4, for
damage and the foat
hinge for wear
on
the
bearing
surface, through which
the foat axle passes.
Excessive
wear on the tab
of
the
INLET
NEEDLE
EXAMINE
(es\ro
rae
ro
AD,rusr)
Flg.
4
float hinge, that
contacts
the inlet
needle, will require
replacement
of the foat.
(This
will assure proper
fuel
metering within
the
carburetor.)
When the
float is reassembled
with the inlet
needle
in
position,
the float
setting is
measured
according to
the
index pad
on the
carburetor
body.
(Two
different
foat
settings
are available.)
l.
Set
the
float at .180"-.200"
by measuring
from
the machined index pad
on the carburetor
body. For
convenience, use a
s/ro"
drill as illustrated in
Fig. 5.
3/l_6"
MEASURE
F],OAT
SETTING FROM
INDEX PAD
SURFACE TO BOTTOM
OF FIOAT WHEN
INVERTED.
Fig.
5
2.
If the index pad
on the carburetor
body is not
machined, measure the
float setting from the rim
of the
TT{ROTTLE LEI/ER
cHoi{E
a/
THROffLE
STOP
CONTROL
SCRSW
HIGH
SPEED
ADJUSTMENT
SCREWi
l" ,
..:ja
lr6w-*ss€si$$*s#
IDLE ADJUSTMENT
SCREW
FUET,
BOWL DRAIN
F*: