TRANSAXLE FLUID LEAK AT CON. (INSTALL NEW HELIX CON. SEAL)

Subject: TRANSAXLE FLUID LEAK AT HELIX CONVERTER SEAL

Model and Year: 1991-93 LUMINA 1991-93 LUMINA APV

CONDITION:

--------- Some vehicles equipped with a 1991-93 HYDRA-MATIC 4T60-E (RPO M13) transaxle built on or before Julian Date 302 (October 28,1992) may exhibit a fluid leak between the helix converter seal and its bore. Under some conditions the helix converter seal may walk-out partially or completely. Hot weather and/or extreme operating conditions are contributing factors to this concern.

CAUSE:

----- The above condition may be due to the taper of the helix converter seal bore and cannot be repaired at a dealership level.

CORRECTION:

---------- Begin with the "Fluid Leak Diagnosis" ("Automatic Transaxle On-Vehicle Service Section of the 1991-93 Service Manual") which provides a detailed procedure in locating and repairing vehicle leaks.

If it is determined the leak is from the helix converter seal, remove the transaxle assembly and replace it with a Service Replacement Transmission Assembly (SRTA).

SERVICE MANUAL INFORMATION:

Refer to the 1991-93 Service Manual, Automatic Transaxle On-Vehicle Service Section 7A for proper On- Vehicle Service to remove and replace a HYDRA-MATIC 4T60-E transaxle.

LABOR TIME INFORMATION:

Labor time should be charged under Operation Number K7000 for "Transaxle Assembly-Replace" from the appropriate 1991-1993 Labor Time Guide.

PROMS 1992 LB4 VIN Z

TRANS AXLE EMISSION SERVICE B/C SCAN OLD B/C* PLATFORM RPO RPO CLASS PROM KIT CODE I.D. CODE -------- ----- ---- -------- -------- ---- ---- -------- S/T MY2 GU2 NA5/NA6/NB2 16196188 BHWN 6235 AULR/BHSF S/T MY2 GU4 NA5/NA6/NB2 16196192 BHWP 6245 AULS/BHSH S/T MY2 GU6 NA5/NA6/NB2 16196199 BHWR 6255 AULT/BHSJ S/T MD8 ALL NA5/NA6 16192257 BFNF 2295 BARL/AWHH S/T MD8 ALL NB2 16192260 BFNH 2305 BARM/AWHF

C1,C2/K1,K2 MT8 ALL NA5/NA6+NA1 16196134 BHSN 6205 BCZP/AULJ K1,K2 MG5 ALL NA5/NA6+NA1 16196134 BHSN 6205 BCZP/AZUS C1,C2/K1,K2 MT8 ALL NB2+NA1 16196153 BHUU 6225 BCZR/AULM K1,K2 MG5 ALL NB2+NA1 16196153 BHUU 6225 BCZR/AZUT C1,C2 MG5 ALL NA5/NA6 16196152 BHSM 6195 BDCW/AULH C1,C2 MG5 ALL NB2+NA1 16196131 BHUT 6215 BDCX/AUL C1,C2/K1,K2 MD8 ALL NA5/NA6 16192249 BFNC 2275 AULF C1,C2/K1,K2 MD8 ALL NB2 16192253 BFND 2285 AULK G1,G2,G3/M1 MD8 ALL NA5/NA6 16196101 BHSA 6105 AULN/BCKU G1,G2,G3/M1 MD8 ALL NB2 16196108 BHSC 6125 AULP/BCKT

L1 MD8 ALL NA5/NA6 16196104 BHSB 6115 AYAW/BCNU L1 MD8 ALL NB2 16196111 BHSD 6135 AYAX/BCNW

* Old broadcast code is included to help the technician determine if a previous field fix has been installed. If a broadcast code other than one appearing on this list is present, contact Technical Assistance Network (TAN) for instruction.

Parts are currently available from GMSPO.

WARRANTY INFORMATION:

For vehicles repaired under warranty:

LABOR TIME (in hours) LABOR OP M L G C K S T -------- ------------------------------- T0500 - PROM Replace 0.6 0.6 0.6 0.6 0.6 0.6 0.6

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.