line will become restricted sufficiently to
cause a pressure buildup at the pump
hub seal. Leakage or complete failure of
Remove
the pump hub seal will result.
the seal drain line from the converter
housing periodically and check for car-
bon buildup.
If any carbon is evident,
remove the deposit and reinstall the fit-
ting and seal drain line.
Watch the
flywheel housing drain hole for
engine
indications of leakage at the pump hub
seal.
If the problem of carbon buildup
persists, correct the conditions causing
high operating temperatures.
Troubleshooting
The information in Table 4C-1 on page
4C-8 will help you locate the source of
Figure 4C-4. Checking Converter-in
converter trouble. This table is organ-
Pressure
ized to cover troubles that may occur
ing was defective at converter overhaul,
first - due to improper maintenance.
check the converter installation as out-
Remember that the converter is part of
l i n e d below.
the power package, and, therefore, the
whole package must be considered when
Check the runout of the engine crank-
running down the source of trouble.
shaft with the engine bell housing face.
This should not exceed 0.013 of an inch
(0.33 mm). If the runout does exceed
RemovaI
0.013 (0.33 mm). See Engine Repair,
S e c t i o n 11.
If the torque converter is to be removed
at the time the engine is removed, refer
Check the runout of the engine flywheel
to the topic Engines, in Subsection 4A.
housing pilot diameter with the engine
The torque converter can be removed
crankshaft. This should not exceed
from the upper without removing the en-
0.013 of an inch (0.33 mm). If the run-
gine by following this procedure.
out does exceed 0.013 (0.33 mm). See
Engine Repair, Section 11 before continu-
1. Remove the machine house sheet metal
ing.
over the torque converter, as necessary.
Check to see whether seal rin (see item
2. Disconnect the clutch operating mech-
10, Figure 4C-39 on page 4C-341, is
anism from the torque converter.
preventing the cover from adequately
squeezing the bearing outer race. The
3. Disconnect the propeller shaft from
seal chamfer must be large enough to
the torque converter.
prevent the seal from overlapping the
chamfer and holding the cover away from
4. Drain the hydraulic reservoir. Mark
the flywheel.
and disconnect the hydraulic lines to the
t o r q u e c o n v e r t e r . Plug the lines to pre-
If misalignment between the engine and
vent the entry of dirt.
converter is found to be excessive, do
not install the converter until it is cor-
5. Disconnect the leads from the temper-
rected. Misalignment puts abnormal
ature and pressure sending units at the
loads on the pilot bearing and could con-
top of the torque converter.
tribute to a premature bearing failure.
6. Disconnect all necessary electrical and
OIL SEAL DRAIN LINE. Excessively
mechanical items from the torque con-
high converter operating temperature
verter. Make a visual inspection to make
will sometimes result in oxidation of the
sure everything has been disconnected
oil, causing carbon deposits to occur in
and out of the way to allow removal of
the hydraulic system. The seal drain
the torque converter.
Transmissions
