Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSTOYOTA1985CELICA SUPRA BASE, AUTOMATICREPAIR AND DIAGNOSISTRANSMISSIONAUTOMATIC TRANSOVERHAUL - A43, A44 & A46COMPONENT DISASSEMBLY & REASSEMBLYCENTER SUPPORT ASSEMBLYDISASSEMBLY
1985 Toyota Celica Supra Base, Automatic
Center Support Assembly: Disassembly
1985 Toyota Celica Supra Base, AutomaticSECTION Disassembly
- Remove snap ring from end of sun gear shaft. Remove planetary sun gear with No. 1 one-way clutch from center support. Repeat procedure used in rear clutch disassembly to check No. 1 brake piston stroke. Piston stroke should be .031-.059" (.78-1.50 mm) for A-43D and A-44D transmissions, and .032-.068" (.80-1.73 mm) for A-46DE and A-46DF transmissions. If piston stroke is not as specified, inspect discs. See Fig 1.
- Remove snap ring from front of center support. Remove flange, disc(s) and plate(s). See Fig 2. Using Spring Compressor (09369-20040) and press, compress piston return spring. Remove snap ring. Remove piston return spring.
- Hold No. 1 brake piston and apply air pressure to center support oil hole to remove No. 1 brake piston. See Fig 1. Remove "O" rings and oil seal rings. Turn center support over.
- Check No. 2 brake piston stroke. Repeat test procedure used previously for checking piston stroke on No. 1 brake piston. See Fig 3. Piston stroke should be .0398-.0886" (1.01-2.25 mm) for all transmissions. If piston stroke is not as specified, inspect discs. Remove rear snap ring, flange, discs and plates. Note location and number of components. See Fig 4.
- Using Spring Compressor (09369-20040) and press, compress piston return spring. Remove snap ring. Remove piston return spring. Hold No. 2 brake piston and apply air pressure to center support oil hole to remove No. 2 brake piston. See Fig 3. Remove "O" rings.
- Hold No. 1 one-way clutch and rotate planetary gear. Sun gear should rotate freely in counterclockwise direction and lock in clockwise direction. If component does not test as described, one-way clutch requires replacement. Loosen staked part of rear side retainer. Remove No. 1 one-way clutch and 2 retainers from outer race. See Figure. Using a pin punch and hammer, remove front side retainer. Remove oil seal rings from sun gear.
- Remove thrust washer from front planetary gear. Hold one-way clutch inner race and rotate planetary gear. Planetary gear should rotate freely in counterclockwise direction and lock in clockwise direction. Remove one-way clutch inner race. Remove snap ring, one-way clutch and 2 retainers. See Figure.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.