NO TCC RELEASE 125C AUXILIARY VALVE BODY GASKET

MODELS AFFECTED: 1982-1984 CIMARRON

1982-1984 Cimarrons equipped with a THM 125C transaxle may experience poor fuel economy and/or engine chuggle or shudder due to the Torque Converter Clutch (TCC) either failing to release or apply. This may be caused by a missing or mispositioned orifice cup plug in the auxiliary valve body assembly, or an eroded gasket on the auxiliary valve body cover. Beginning with September, 1983 production (transaxle numbers 84 CA 1130 and 84 CB 18587), the auxiliary valve body and gasket were changed to eliminate this condition. The new auxiliary valve body does not have a hole for an orifice cup plug (refer to Figure 1) and uses a new cover gasket with larger holes in three areas (refer to Figure 2). When servicing a THM 125C for this condition, refer to the following service and parts information.

Service Procedure

1. Perform TCC diagnosis as outlined in Section 7A of the Service Information Manual. If diagnosis indicates an auxiliary valve body condition, remove the auxiliary valve body from the transaxle following the procedures outlined in the Service Information Manual.

2. Inspect the auxiliary valve body to determine if it is the original. If the auxiliary valve body has the hole used for an orifice cup plug (refer to Figure 1), whether or not the orifice cup plug is present, proceed to Step 3. If no hole is used, proceed to Step 4.

3. ORIGINAL AUXILIARY VALVE BODY

Condition Correction

a. Orifice cup plug and auxiliary Replace gasket with P/N 8653947 and valve body okay. Gasket cover with P/N 8643645 eroded at hole # 1.

b. Auxiliary valve body and Replace orifice plug with P/N 8623796 and gasket okay. Orifice cup gasket with P/N 8643239. To replace the plug mispositioned or missing. orifice plug, remove using a 7/32 screw extractor. Apply loctite to the new plug. Start the new plug using a 5/16 punch and seat flush with the wall using a 3/8 punch.

c. Orifice plug and gasket okay. Replace auxiliary valve body with service kit P/N 8653946 containing new auxiliary valve body, cover, and gasket. The original is no longer serviced. The auxiliary valve body included in this service kit does not contain TCC control and regulating valves, or regulator spring.If needed, these parts are available separately under the following part numbers:

Valve, TCC Control P/N 8637089 Valve, TCC Regulator P/N 8637090 Spring, TCC Regulator P/N 8637888

4. NEW AUXILIARY VALVE BODY

Condition Correction

a. Gasket eroded at hole # 1. Replace gasket P/N 8643863 and cover Auxiliary valve body okay. P/N 8643645.

b. Gasket okay. Replace auxiliary valve body with service kit P/N 8653946 containing auxiliary valve body, cover, and gasket. The auxiliary valve body included in this service kit does not contain TCC control and regulating valves, or regulator spring. If needed, these parts are available separately under the following part numbers:

Valve, TCC Control P/N 8637089 Valve, TCC Regulator P/N 8637090 Spring,TCC Regulator P/N 8637888

When performing the listed repairs, be sure the correct gasket is used. All GMWDD stock of both original and new type gaskets are now made using a new material. The new cover is used to service both designs.

Warranty Information

Replace Auxiliary Valve Body Cover Labor Operation No. K6545 at .9 hour. and Gasket Replace Auxiliary Valve Body Labor Operation No. K65 75 at 1.2 hours. Repair Auxiliary Valve Body Add .1 hour to K6575 if repaired.

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.