Paragraphs
43·47
FLYWHEEL
All Gasoline Models
43.
Th
remove the flywheel, separate
engine from transmission case as out·
lined in paragraph 112 and remove the
clutch. The starter ring gear can be
renewed after removing the flywheel.
Th
install a new ring gear, heat gear even
ly to approximately 232°C (405°F) and
install on flywheel with beveled edge of
teeth facing front of engine.
One flywheel mounting stud is off
center so flywheel can only be installed
m
the correct position. Tighten the
flywheel retaining screws to a torque of
95-102 N
·
m (70-75
ft
.
.
Jbs.J.
OIL PUMP
All Gasoline Models
44. The gear type oil pump is
mounted
on the bottom of front main bearing cap
and is gear driven from crankshaft tim
ing gear. Pump
is
accessible after oil pan
is removed. Shims (2-Fig. 42) control the
backlash of oil pump drive gear (15).
Recommended backlash is 0.089-0.107
mm (0.0035-0.0042 inch). If backlash is
not as specified, vary the thickness of
shim pack (2). Be sure that main cap is
tightened to recommended torque of
115-129 N
·
m (85-95 ft.lbs.J when check·
ing backlash.
Check pump internal gears (5 and 8)
for backlash, which should be 0.03-0.13
mm (0.001-0.005 inch). End play of
gears
with a 0.18 mm (0.007 inch) thick gasket
(6) installed, should be 0.05·0. 10
mm
(0.002-0.004 inch). Recommended
diametral clearance between gears and
pump body is 0.08-0.10 mm
(
0
.
003-
0
.
00
4
inch). If clearance exceeds 0.13 mm
<0.005 inch), renew gears and/or body.
When installing pump cover (7),
tighten retaining screws to 11-14
N
·
m
(8-10 ft.-lbs.). Refer to paragraph 45 for
information on pressure relief valve.
24
Fig. 44-Exploded view of
typical carburetor. Parts
shown In squares ere major
differences for smeller cer
burttor used on MF230
models.
1
Throule piBle
2
Throttle
shan
3
Idle
•peed sere"'
4 Throule body
5
ldl�
mtxture
n....dl<·
6
Idle
Jet
7
Fuel
tnlet �It & -t
8
float
ohafl
9 Float
10
Ventun
IIA &
liB. MatnJel
12
Plug
13 Float
chamber
14
Well vent
15 Mom
dtocharge
}1'1
16
Choke valve
RELIEF VALVE
All Gasoline Models
45. The plunger type oil pressure
relief valve (10 through 14-Fig. 42) is
located in oil pump body. Normal
operating oil pressure should be not less
than 50
k.Pa
(7 psi) at low idle and
140-205 kPa (20-30 psi) at 1800 rpm.
Relief valve setting is adjustable by vary
ing the number of adjusting shims (13).
The relief valve spring (11) should have
a free length 49.2-52.4 mm (1-15/16
t.o
2-1/16 inches). Spring should test 57.3-
59.5 N (12.9-13.3 pounds) when com·
pressed to working length of 34.9 mm
(1.375 inches).
Fig. 43-Cerburetor (A) Is
Zenith
13795
used on MF235
end MF245 models. Car
buretor (8) Is Zenith
OE3435
used on MF230 models.
I.
Idle
mtxturo
2.
Idle
rpHd •top
ocrow
3
Throttlo
•rm
4 Choharm
MASSEY -FERGUSON
A
CARBURETOR
All Gasoline Models
46. ADJUSTMENT. Zenith car
buretors
are
used on all models. The
smaller OE3435 carburetor (B-Fig. 43)
is used on MF230 models, while 13795
is
used
on MF235 and MF245 models. In
itial setting of idle mixture needle (1) is
2 to 2-112 t
urns
open from closed position
on the smaller carburetor,
5/8
to 3/4 turn
open for the larger 13795 carburetor (A).
Final adjustment should be made with
engine operating at. normal temperature.
After mixture
i
s
correctly set, adjust. low
idle speed to 725-775 rpm for all models.
47. OVERHAUL. Zenith OE3435 car
buretor
used
on MF230 model tractors
is smaller and slightly different than the
13795 carbUJ·elor used on MF235 and
MF245 model tractors. Refer to Fig. 43.
Th
disassemble the removed car
buretor, ftrsl clean out.side with a
suitable solvent. Remove the
screws
re
taining throttle body (4-Fig. 44) to fuel
bowl (13) and remove fuel bowl. Remove
float shaft (8), float. and inlet valve
needle.
NOTE: Float shaft (8) Is a tight fit In slot
ted side of hinge bracket and should
be
removed from opposite side.
Remove venturi (10), inlet valve seal
and idle jet (6) from throttle body.
Remove idle adjusting needle (5). Remove