Ninety-Eight FWD V6-181 3.0L (1985)
Valve Body: All Technical Service Bulletins
A/T - Supplemental Diagnosis
SUBJECT
SUPPLEMENTAL DIAGNOSIS FOR THM 440-T4
NUMBER: 85-T-43
TRANSAXLE
DATE:
Sept.. 24, 1985
MODELS/YEARS
1984-85 CUTLASS CIERA &
1985 NINETY-EIGHT
SECTION: 7A
Accurate diagnosis is essential to determine if a transaxle can be corrected by procedures which do not require an exchange unit.
An updated 440-T4 diagnosis section is included in the 1985 Firenza, Calais, Cutlass Ciera and Ninety-Eight Chassis Service Manual, Vol. II. Further
diagnostic information is as follows:
No Upshift
A.
Governor - Cause may be an imprex particle under governor ball. Imprex is an impregnation plastic used to seal cases against porosity.
When the engine is shut off, the particle may float back into the governor feed passage and then lodge again in the governor when engine is
restarted. To correct this condition, remove the governor, reinstall the governor cover and operate the engine to flush the oil passages. Clean the
governor. To verify that the cleaned governor is operable, seat the balls by holding the governor weights against them. Pour solvent into the
governor shaft and inspect for leakage past the balls. If no leakage is noted, reinstall governor.
B.
Leakage at governor oil pipe retainer; loose or stripped retainer bolt.
C.
Valve body - 1-2 shift valve train may be stuck in valve body. Remove any burrs or raised metal on valves with a flat hone stone. DO NOT remove
any more metal from valve than necessary. 1-2 valve is an aluminum alloy. Inspect TV valve for freeness.
The valve body can be removed and replaced without removing the transaxle from the car. Use care to catch check balls during removal.
TCC Shudder
A.
A rolled or cut TCC accumulator piston seal.
B.
Turbine shaft seals cut or damaged.
C.
TCC solenoid O-ring cut or broken. On-car service.
Intermittent No Drive or No Drive At All
Input sprag failure.
Erratic, Rough Shifts, Slipping Shifts, 2nd Gear Starts
A.
Vacuum related conditions. Refer to Dealer Technical Bulletin 85-T-16.
B.
A vacuum line that is pinched or kinked may cause vacuum to be retained in the modulator, resulting in low pressure and possible second clutch
distress. If fluid inspection indicates a burned clutch, a SRTA unit should be considered. Replace vacuum line.
C.
A vacuum problem may result in No. 10 check ball peening into the spacer plate seat. Leakage at No. 10 check ball may influence shift quality or
TCC operation. On-car correction is recommended if the clutch is not burned.
1st Gear Shudder
A.
May also exhibit:
-
Slip or second gear start
-
Slip or flare on 2-3 shift
-
Flare/freewheel in 3rd on light acceleration
-
No drive, reverse OK
