TRUCK SERVICE MANUAL
TRANSMISSION
PREVENTIVE MAIETENANCE
Para 3-7/3-8
j. Alternately tighten screws 180 apart to 5 pound
c. After draining is completed, remove 23 washer-
head screws 33 (A, foldout 14)that retain the oil pan to
feet (8 Nm) torque. Repeat the process tightening the
the transmission housing. Discard pan gasket 29 and
screws to 10 to 13 pound feet (14 to 18 Nm) torque.
clean the pan with mineral spirits or paint thinner.
k. Install the filler tube at the side of the pan. On
later models install the oil drain plug at the rear of the
d. Remove washer-head screw 28 (A, foldout 14)
and washer 27, and remove the oil filter (and spacer 26
pan.
on later models). Discard the filter.
l. Remove the dipstick and pour approximately 26
US quarts (24.6 litres) of transmission fluid into the
e. Prior to installing the new filter, install a new
seal-ring 24 (A, foldout 14) onto the oil intake pipe
transmission through the filler tube. Then check the oil
(integral with filter).
Lubricate the seal-ring with
level using the procedure described in paragraph 3-3.
transmission fluid.
3-8. OIL CONTAMINATION
f. Install the new oil filter (aligned so that filter does
not require twisting), inserting the oil intake pipe into the
a. Examine at Oil Change. At each oil change,
hole in the bottom of the transmission. Secure the oil
examine the oil which is drained for evidence of dirt or
filter with a 5/16-18 x 5/8-inch, washer-head screw.
water. A normal amount of condensation will emulsify in
Tighten the screw to 10 to 13 pound feet (14 to 18 Nm)
the oil during operation of the transmission. However, if
torque.
there is evidence of water, check the cooler (heat
exchanger) for leakage between the water and oil areas.
g. Place the oil pan gasket onto the oil pan. Do not use
Oil in the water side of the cooler (or vehicle radiator) is
any substance as a gasket retainer.
another sign of leakage. This, however, may indicate
leakage from the engine oil system. Any accumulation of
CAUTION
sludge or soft dirt in the sump should be removed.
Do not use gasket-type sealing
b. Metal Particles. Metal particles in the oil (except
compounds any place inside the
for the minute particles normally trapped in the oil filter)
transmission or where they might get
indicate damage has occurred in the transmission.
washed into the transmission. Also, only
When these particles are found in the sump, the
oil-soluble greases may be used (except
transmission must be disassembled and closely
oil pan gasket)for temporarily retaining
inspected to find the source. Metal contamination will
parts during assembly.
Nonsoluble
require complete disassembly of the transmission and
vegetable base cooking compounds or
cleaning of all internal and external circuits, cooler, and
fibrous greases must not be used inside
all other areas where the particles could lodge.
the transmission.
c. Coolant Leakage. If engine coolant leaks into
h. Install the oil pan and gasket, carefully guiding
them into place. Guard against dirt or foreign material
the transmission oil system, immediate action must be
entering the pan. Retain the pan to the housing with four
taken to prevent malfunction and possible serious
5/16-18 washer-head screws. Install each screw, by
damage.
The transmission must be completely
hand, one at a time, into each corner of the pan.
disassembled, inspected and cleaned. All traces of the
coolant, and varnish deposits resulting from coolant
i. Install the remaining 19 washer-head screws by
contamination, must be removed. Water and/or coolant
hand, carefully threading each one through the gasket.
contamination will cause rapid deterioration of resin-
Bottom all screws before tightening them.
graphite clutch plates.
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