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TURBO HYDRA-MATIC 3 5 0 TRANSMISSION
7A3-53
Fig.
7A3-133
Installing Jam Nut
Installing Oil Pan, Governor and Modulator Valve
1. Install new bottom pan gasket and bottom pan (Fig.
7A3- 144).
2. Install governor assembly, cover and seal and retainer
wire (Fig. 7A3-145). Use extreme care not to damage cover.
If cover is damaged it must be replaced.
3. Install vacuum modulator valve and modulator (Fig.
7A3-146). Lubricate "0" ring seal to prevent damage, install
retaining clip and torque bolt to 12 lb. ft.
CONVERTER CHECKING PROCEDURE
Converter Replacement
A converter should be replaced only if one of the
following conditions exist:
1. The front oil pump cover or body are badly scored.
This results in having cast iron grindings entering the
converter and the oil circuit.
2. "Aluminized" oil in the converter. This comes as a
result of internal converter failure.
3. End play in the converter exceeds .050".
4. External leaks.
5. A scored or damaged hub which could cause front seal
failure or front pump bushing failure.
6. A broken, damaged or bad fitting converter
crankshaft pilot.
7. The converter has an unbalance which results in a
vibration that cannot be corrected.
A converter should not be replaced for any of the
following conditions:
1. The oil has an odor, is discolored and there is no
evidence of metal particles.
2. The oil cooler was defective, allowing engine coolant
to enter the transmission.
3. A small amount of wear appears on the hub where
the oil pump drive gear locates. A certain amount of such
wear is normal for both the hub and oil pump gear.
4. The threads in one or more of the three converter bolt
holes are damaged. Correct such conditions with the use of
a Heli-coil or its equivalent.
Check Converter For Leaks as Follows:
1. Install tool J 21369 and tighten (Fig. 7A3-147).
2. Fill converter with air, 80 psi.
3. Submerge in water and check for leaks.
4. Bleed air pressure and remove tool.
Check Converter End Clearance as Follows:
1. Install tool J 21 37 1-2 and tighten cap nut (Fig. 7A3-
148).
2. Install tool J 21371-3 and tighten hex nut (Fig. 7A3-
149).
3. Install dial indicator set at zero.
4. Loosen hex nut while holding cap nut stationary (Fig.
7A3-150). When nut is fully loosened, the reading obtained
on the dial indicator will be converter end clearance. If
clearance is .050" or over and the oil has the appearance of
having been mixed with aluminumpaint, replace the
converter.
When replacing the converter refer to the part number
as each THM 350 model uses a specific converter.
Install Converter (Fig. 7A3-151)
1. Install converter, making sure that the converter hub
engages the drive keys inside the pump gear. If they don't
engage, a low mileage pump failure will occur.
2. Make sure that the converter hasn't bound up the
pump gear inside the transmission.
3. Check the converter to be sure that it turns freely and
is able to move forward to meet the flywheel.
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