CRANKSHAFT OIL SEALS
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the bronze washer •• 002" and .008" shims
are used between the steel thrust washer and
the shoulder on the crankshaft to adjust the
end clearance. Either the shaft tnust be re-
moved to adjust end play or a special puller
used to remove the crankshaft timing gear.
When installing the crankshaft, the crankshaft
The crankshaft seals are Neoprene seals,
spring loaded. They must be installed with
the lips toward the oil supply in the oil sump.
The seals must be replaced each time the crank-
shaft is removed or the timing gear cover
removed. The front seal has a felt seal installed
on the outside of the Neoprene seal. Shellac the
felt seal to the face of the Neoprene seal. When
replacing seals, be careful not to damage the die
cast retainer.
If difficulty is encoWltered with the seals seeping
or leaking oil, check the surface of the crank-
shaft at the flywheel end contacted by the oil
seal and the surface of the crankshaft fan pulley
contacted by the front seal. If these diameters
are worn too small for the seal to make a firm
contact, the parts should be replaced. Be sure
gear must be meshed with the camshaft gear
according to the marks. There is one mark
on the c rank gear and two on the ~am gear.
Place the single mark between the double mark.
The main bearing caps are marked No.1 and'
No.2 and the block correspondingly and these
marks should face the camshaft side of engine.
the regular oil sump capscrews are used in the
center hole of the rear oil seal retainer. If an
extra long capscrew is used on this position,
it will force the seal away fron1 the retainer.
OIL PUMP
Removal
Remove the engine from the tractor and remove
the clutch and flywheel. The pump is mounted
at the rear of the engine bloc~ and is driven by
the camshaft. The capsc rews that attach the
oil pump to the cylinder block also hold the
pump assembly together.
Inspec tion
Check the pump for gear back lash, which should
not be more than .005". The clearance between
the tips of the teeth and the pump body should
not exceed .004". The clearance between the
gear and cover for the side clearance of gears
should not exceed .004". The minimum per-
missable oil pressure is 7 pOWlds per sq. inch.
Later pumps have short idler shaft and no hold
in plate.
The drive shaft clearance should not exc\~ed
.006". The desired clearance is from .002' to
.003" •
Assembly.
A .007" thick lead gasket is placed between the
body and the cover and the treated paper gasket
is placed between the pump <lndcylinder block.
If oil pump strikes clutch housing it will cause
gears to cut into pump body, shearing drive pin.
When repai ring the pump, the oil sc reen and
suction line to the pump should be checked and
must be clear and free of leaks. The oil gallery
in the cylinder block must be clean to 15 foot
Ibs. Use a sealer on paper gasket between body
and block.
The desired oil pressure is 15 to 20 pounds
G-19
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