Torque Converter

TM 10-3930-633-34

(3) Install the input shaft, engaging the

7-11. Torque Converter

splines with the turbine hub.

a. General. The torque converter is mounted

(4) While holding the pump stationary,

on the input end of the transmission and consists

attempt to rotate the turbine with the input shaft.

of an impeller, stator turbine and converter

The turbine should rotate freely in both directions

clutch .

without any signs of interference or scraping

b. Removal. The torque converter and

noise.

transmission are separated upon removal of the

f. Installation.

transmission from the engine. Refer to Chapter 2,

(1) Carefully position the converter and

Section IV. The torque converter can be simply

housing to the transmission making sure the

lifted from the converter housing upon removal of

converter drive flats are fully engaged in the

the housing from the engine. The torque con-

pump gear. Install a wedge to prevent the con-

verter is not repairable and must be replaced

verter from slipping out of the housing.

complete.

(2) Refer to Chapter 2, Section IV for

c. Cleaning. When internal wear or damage

transmission assembly installation.

has occurred in the transmission, metal particles,

clutch plate or band material may have been

7-12. Transmission Disassembly and

carried into the converter. These contaminants

Reassembly

are a major cause of recurring transmission

a. Disassembly.

troubles and MUST be removed from the system

(1) Before removing any of the transmission

before the transmission is put back into service.

subassemblies, thoroughly clean the outside of

T h e converter must be cleaned by using a

the transmission case to prevent dirt from getting

mechanically agitated cleaner.

inside the mechanism.

d. Stator to Impeller Interference Check.

(2) After the transmission has been removed

(1) Position the front pump assembly on a

from the vehicle, disconnect the oil cooler lines at

bench with the spline end of the stator shaft

the transmission. Place the unit in a work stand

pointing up.

or on a clean bench.

(2) Mount a converter on the pump so that

(3) Remove the transmission pan, gasket,

the splines on the one-way clutch inner race.

and screen retainer clip.

engage the m sting splines of the stator support,

(4) Lift the screen from the case.

and the converter hub engages the pump drive

(5) Remove the spring seat from the pressure

gear.

regulator. Maintain constant pressure on the seat

(3) While holding the pump stationary, try

to prevent distortion of the spring seat and the

to rotate the converter counterclockwise. The

sudden release of the springs. Remove the

converter should rotate freely without any signs

pressure regulator springs and pilots, but do not

of interference or scraping within the converter

remove valves.

assembly.

(6) Remove the small compensator pressure

(4) If there is an indication of scraping, the

tube from the pressure regulator and the control

trailing edges of the stator blades may be in-

valve body.

terfering with the leading edges of the impeller

(7) Remove the main pressure oil tube first,

blades. In such cases, replace the converter.

by gently prying up the end that connects to the

(5) If interference exists, the stator front

main control valve assembly, then, remove the

thrust washer may be worn, allowing the stator to

other end of the tube from the pressure regulator.

hit the turbine. In such cases, the converter must

Be sure to remove the tube in this manner.

be replaced.

Failure to do so could kink or bend the tube

(6) The converter crankshaft pilot should be

causing excessive transmission internal leakage.

checked for nicks or damaged surfaces that could .

(8) Loosen the front and rear servo band

cause interference when installing the converter

adjusting screws five turns. Loosen the front

into the crankshaft. Check the converter front

servo attaching bolts three turns.

pump drive hub for nicks or sharp edges that

(9) Remove the vacuum diaphragm unit and

would damage the pump seal.

pushrod.

e. Stator to Turbine Interference Check.

(10) Remove the control valve body at-

(1) Position the converter on the bench front

taching bolts. Align the levers to permit removal

side down.

of the valve body. Then lift the valve body clear of

(2) Install a front pump assembly to engage

the transmission case. Pull the body off the servo

the mating splines of the stator support and

tubes and remove it from the case.

stator, and pump drive gear lugs.

7-11