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7-82
PART
7-3
FMX AUTOMATIC TRANSMISSION
Sedloa
Pale
Seedoa
Page
1 Diagnosis and Testing ....•.
•
.
•
.•.......•.. 7- 82
2 Common Adjustments and Repairs •.••.••••• 7- 88
3 Cleaning and Inspection ••••.•.••..•.•.•..•..• 7-89
S In-Car Adjustment and Repain .•....•....• 7-103
6 Removal and Installation ................. 7-108
7 Major Repair Operations ................... 7-109
4 Description .•.•.•.•••..••...•••....•••.• 7-
9.
5
D
DIAGNOSIS AND TESTING
When diagnosing transmission prob-
lems, first refer to the diagnosis guide
for the detailed information on the
items that could be causing the prob-
lem.
The following preliminary checks
should be m!!tle before proceeding
with other diagnosis
checks.
TRANSMISSION FLUID LEVEL CHECK
1. Make sure that the vehicle is
standing level. Then firmly apply the
parking brake.
2. Run the engine at normal idle
speed.
If the transmission fluid is
cold run the engine at fast idle speed
(about
1200 rpm) until the fluid
reaches its normal operating tem-
perature.
When the fluid is warm,
slow the engine down to normal idle
speed.
3. Shift the selector lever through
all
positions.
and place the lever at
P.
Do not turn off the engine during
the fluid level checks.
4. Clean all dirt from the transmis-
sion fluid dipstick cap before remov-
ing the dipstick from the filler
tube.
S. Pull the dipstick out of the
tube,
wipe it clean, and push it all
the way back into the
tube.
Be sure
it is properly
seated.
6. Pull the dipstick out of the
tube again, and check the fluid level.
If necessary, add enough fluid to
the transmission through the filler
tube to raise the fluid level to the
F (full) mark on the dipstick. Do
not overfill the transmission. Install
the dipstick, making sure: it is fully
seated in the tube.
FLUID AERATION CHECK
A fluid level that is too high will
l:ause the fluid to become aerated
:
Aerated fluid will cause low control
pressure, and the aerated fluid may
be forced out the vent.
Check the transmission fluid level.
Low fluid level can affect the oper-
ation of the transmission, and may
indicate fluid leaks that could cause
transmission damage.
TRANSMISSION FLUID
LEAKAGE CHECKS
Check the speedometer cable con-
nection at the transmission. Replace
the rubber seal if necessary.
Leakage at the oil pan gasket often
can be stopped by tightening the at-
taching bolts to the proper torque. If
necessary, replace the gasket.
Check the fluid filler tube con-
nection at the transmission. If leakage
is found here, install a new 0-ring.
Check the fluid lines and fittings
between the transmission and the
cooler in the radiator tank for loose-
ness, wear, or damage. If leakage
cannot be stopped by tightening a
fitting, replace the defective parts.
Check the engine coolant in the
radiator. If transmission fluid is pres-
ent in the coolant, the cooler in the
radiator is probably
leaking.
The cooler can be further checked
for leaks by
disconnecting·
the lines
from the cooler fittings and applying
50-75 psi air pressure to the fittings
.
Remove the radiator cap to relieve
the pressure build at the exterior of
the oil cooler tank. If the cooler is
leaKing and will not hold this pressure
the cooler must be replaced
.
Cooler
replacement is described in the Cool-
ing System Section of Group II.
If leakage is found at either the
downshift control lever shaft or the
manual lever shaft, replace either or
both seals.
Inspect the pipe plug on the left
side of the transmission case at the
front. If the plug shows leakage,
torque the plug to specifications. If
tightening does not stop the leaks. re-
place the plug.
When converter drain plugs leak,
remove drain plugs with
a
six-point
wrench
.
Coat the threads with Fo-
MoCo Perfect Seal Sealing Com-
pound or its
equivalent,
and install
the plugs. Torque the drain plugs to
specification.
Fluid leakage from the
converter housing may be caused by
engine oil leaking past the rear main
bearing or from oil gallery plugs, or
power steering oil leakage from steer-
ing system. Be sure to determine the
exact cause of the leak before repair
procedures are started.
Oil-soluble aniline or fluorescent
dyes premixed at the rate of I /2 tea-
spoon of dye powder to I /2 pint of
transmission fluid have proved helpful
in locating the source of the fluid
leakage.
Such dyes may be used to
determine whether an engine oil or
transmission fluid leak is present or
if the fluid in the oil cooler leaks into
the engine coolant system
.
A black
light. however. must be used with the
fluorescent dye solution.
FLUID LEAKAGE IN
CONVERTER AREA
In diagnosing and correcting fluid
leaks in the front pump and convert-
er area, use the following procedures
to facilitate locating the exact
ca
use
of the leakage
.
Leakage at the front
of -transmission,
as
evidenced
by
fluid around the converter
housing.
may have several
sources.
By
ca
reful
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