TORQUE CONVERTER LEAKAGE
Possible sources of torque converter leakage are:
• Torque converter weld leaks at the outside
(peripheral) weld.
• Torque converter hub weld.
NOTE: Hub weld is inside and not visible. Do not
attempt to repair. Replace torque converter.
FLUID LEAKAGE—DIFFERENTIAL HOUSING AREA
The differential uses Mopart 75w-90 Fuel Saving
petroleum based hypoid gear lube. It can be distin-
guished from ATF by its brown color (ATF is dyed
red). Also gear lube has a distinctive odor (hypoid
smell).
(1) If it is suspected that the leakage is gear lube,
check the differential for proper fluid level. High oil
level can result in leakage from the differential vent.
CAUTION: A crushed vent baffle will cause oil to
leak from vent hose.
(2) If fluid level is correct, add 1/4 to 1/2 ounce of
leak detecting florescent dye to the differential.
(3) Clean the suspect area of the transaxle with
solvent.
(4) Road test the vehicle until the leak reoccurs.
(5) Using a black light determine the source of the
leak and repair as required.
(6) Do not add oil dye to both the ATF sump and
the differential sump at the same time. This can
cause confusion when trying to pinpoint a leak
source.
FLUID LEAKAGE-TORQUE CONVERTER
HOUSING AREA
When diagnosing converter housing fluid leaks,
three actions must be taken before repair:
(1) Verify proper transmission fluid level.
(2) Verify that the leak originates from the con-
verter housing area and is transmission fluid.
(3) Determine the true source of the leak.
Fluid leakage at or around the torque converter
area may originate from an engine oil leak (Fig. 33).
The area should be examined closely. Factory fill
fluid is red and, therefore, can be distinguished from
engine oil.
Some suspected converter housing fluid leaks may
not be leaks at all. They may only be the result of
residual fluid in the converter housing, or excess
fluid spilled during factory fill, or fill after repair.
Converter housing leaks have several potential
sources. Through careful observation, a leak source
can be identified before removing the transmission
for repair.
Pump seal leaks tend to move along the drive hub
and onto the rear of the converter (Fig. 33). Pump
o-ring or pump body leaks follow the same path as a
seal leak. Pump attaching bolt leaks are generally
deposited on the inside of the converter housing and
not on the converter itself. Pump seal or gasket leaks
usually travel down the inside of the converter hous-
ing (Fig. 33).
Fig. 32 Weep Hole Location
1 – RIGHT EXHAUST PIPE
2 – TRANSAXLE CASE
3 – TRANSAXLE OIL PAN
4 – WEEP HOLE
Fig. 33 Converter Housing Leak Paths
1 – PUMP SEAL
2 – PUMP VENT
3 – PUMP BOLT
4 – PUMP GASKET
5 – CONVERTER HOUSING
6 – CONVERTER
7 – REAR MAIN SEAL LEAK
LH 42LE TRANSAXLE 21 - 25
DIAGNOSIS AND TESTING (Continued)
To Next Page
Loading...
