Converter Housing Fluid Leak Diagnosis; Front Servo Test; Rear Servo Test; Leak Diagnosis Procedure - Jeep J-10 Series 1982 Technical & Service Manual

2C-16 AUTOMATIC TRANSMISSION
Front Servo Test
Apply air pressure to the front servo apply passage.
The servo rod should extend and cause the band to
tighten around the drum. While are pressure is applied,
check for excessive air leakage. Spring tension should
release the servo when air pressure is removed.
Rear Servo Test
Apply air pressure to the rear servo apply passage.
The servo rod should extend and cause the band to
tighten around the drum. While air pressure is applied,
check for excessive air leakage. Spring tension should
release the servo when air pressure is removed.
CONVERTER HOUSING FLUID LEAK DIAGNOSIS
When diagnosing converter housing fluid leaks, two
facts must be established before attempting repair.
First, it must be verified that a leak condition does
actually exist and second, the real source of the leak
must be determined. Failure to establish these facts
beforehand can result in incorrect or unnecessary
repairs.
In some cases, suspected converter housing fluid leaks
may not be leaks at all. They may be the result of
residual fluid in the converter housing or excess fluid
spilled during factory filling or initial transmission op
eration. These conditions may be incorrectly diagnosed
as fluid leaks.
Converter housing area leaks may have several
sources. Through careful observation, it is possible to
pinpoint the leak source before removing the transmis
sion. The paths various types of fluid leaks follow are
shown in figure 2C-18 and are described below.
CRANKSHAFT
CONVERTER
ASSEMBLY
OIL PUMP
CRANKSHAFT SEAL LEAK
SEAL LEAK
OIL PUMP
TO-CASE BOLT
LEAK
OIL PUMP
J /GASKET LEAK
TRANSMISSION
CONVERTER
HOUSING
IMPELLER 70895
Fig. 2C-18 Converter Housing Fluid Leak Diagram
1Oil Pump Seal—leaks past the seal lip tend to move
along the drive hub and onto the rear of the con
verter housing. However, if total seal failure occurs,
fluid will be deposited inside the converter housing
only, near the outside diameter of the housing.
• Oil Pump Body—leaks past the pump body follow
the same path as an oil pump seal leak or fluid may
travel down the pump face into the converter
housing.
•Oil Pump-to-Case Bolt—leaks past any one of these
bolts are deposited on the inside of the converter
housing only and not on the converter itself.
• Oil Pump-to-Case Gasket—leaks past the gasket are
deposited inside the converter housing only.
•Front Band Lever Pin Plug—leaks past the plug
threads are deposited inside the housing and not on
the converter.
Leak Diagnosis Procedure
(1) Check fluid level and condition. If fluid level is
high or low, adjust to proper level.
(2) Raise and support vehicle.
(3) Inspect transmission and correct any external
leaks from oil pan gasket, filler tube, governor line to
TCS switch, if equipped, cooler line fittings, pressure
test port plugs and case-to-adaptor housing gasket.
(4) Remove converter housing spacer plate.
(5) Wipe all fluid from converter housing area.
(6) Operate engine at 2000 rpm for 2 minutes and
observe converter housing for fluid accumulation
pattern.
(7) If fluid accumulation pattern is not evident, pro
ceed to next step.
(8) If a circular pattern develops, it indicates a de
fective or damaged torque converter. Correct leak by
replacing converter.
(9) If a trickle develops, it indicates an oil pump
leak caused by one or more of the following conditions:
• Pump drainback hole obstructed.
• Pump housing vent obstructed.
• Pump bushing or converter hub scored, nicked, pit
ted or burred.
• Defective oil pump O-ring, gasket, or seal.
• Front band lever pin plug loose or plug threads in
case are stripped.
(10) Correct these conditions as outlined in following
steps.
(a) Remove transmission and converter.
(b) Tighten front band adjusting screw until
band is tight around front clutch retainer. This will
prevent front clutch assembly from also coming out
when oil pump is removed and prevent damaging clutch
discs.
(c) Remove oil pump and oil seal.
(d) Inspect pump housing drainback and vent
holes for obstructions. If drainback hole cannot be
opened using thin wire, replace pump housing. Check
vent hole by blowing solvent through vent. If vent can
not be opened, replace pump housing.
(e) Inspect condition of pump housing and con
verter hub. If bushing is scored, replace it and polish
hub using fine sandpaper.