CAMPAIGN: CRUISE CONTROL SERVO BAIL BUSHING (DEFECTIVE PART)

Subject: Servo Bail Bushing

Models/Years: Certain 1984-88 Oldsmobile Vehicles With Cruise Control (RPO K34) on Certain Gasoline & Diesel Engines

CONDITION

General Motors has determined that a defect which relates to motor vehicle safety exists in some 1984 through 1988 oldsmobile model vehicles equipped with cruise control (RPO K34) on certain gasoline & diesel engines. A small nylon bushing in the cruise control servo bail (bracket) may slip out of place. This will not affect the operation of the cruise control, but it may cause intermittent increases in engine speed or dieseling (engine run-on with ignition off). If the vehicle is not serviced and the nylon bushing remains out of place, the servo rod assembly could wear through the bail. If the rod wears through the bail, it may catch on other engine components and possibly result in a stuck throttle. Although the vehicle can still be stopped with the service brake, an unexpected loss of accelerator control could result in a vehicle crash.

VEHICLES INVOLVED

Certain 1984 through 1987 Oldsmobile vehicles equipped with Cruise Control (RPO K34) and engines as listed below, and certain 1988 oldsmobile vehicles equipped with Cruise Control (RPO K34) and 5.OL engine within the breakpoints listed below:

Engine VIN Beginning Through & Year Model Model Name Codes VIN Including

1984 G Cutlass Supreme N, Y, 9, V S.O.P. E.O.P. B Delta 88 N, Y S.O.P. E.O.P. B-wag. Custom Cruiser N, Y S.O.P. E.O.P. D Ninety-Eight N, Y S.O.P. E.O.P. E Toronado N, Y S.O.P. E.O.P.

1985 G Cutlass Supreme N, Y, 9 S.O.P. E.O.P. B Delta 88 N, Y S.O.P. E.O.P. B-wag. Custom Cruiser N, Y S.O.P. E.O.P. E Toronado N, Y S.O.P. E.O.P.

1986/7 G Cutlass Supreme Y, 9 S.O.P. E.O.P. B-wag. Custom Cruiser y S.O.P. E.O.P.

1988 G Cutlass Supreme y S.O.P. E.O.P. B-wag. Custom Cruiser y S.O.P. JR306803

Vehicles with Part Number 25074629 or Part Number 12335036 replacement Cruise Control Servos do not require the Bushing Kit called for in this Product Campaign Bulletin. Oldsmobile has eliminated a number of vehicles from this campaign which it was able to identify from warranty records as having the above replacement Servos installed. However, a large number of vehicles may have had the P/N 25074629 and P/N 12335036 Servos installed beyond warranty; those vehicles must be identified by inspection.

DEALER ACTION

To prevent this condition from occurring, dealers are to install a Bushing Kit on the Cruise Control Servo Bail. The cruise control servo assembly is not authorized as a replacement to correct for a missing or out of place bushing. Also, if other repairs are needed to the cruise control system, and the vehicle is out of warranty, the repair would be at the owner's expense.

Dealers are to perform this campaign on all involved vehicles at no charge to owners, regardless of mileage, age of vehicle, or ownership from this time forward.

Whenever a vehicle subject to this campaign is taken into your new or used car inventory, or it is in your dealership for service, you are to ensure the campaign correction has been made before selling or releasing the vehicle.

Dealers are to contact owners of vehicles recently sold from your new vehicle inventory and arrange for the campaign correction to, be performed.

SERVICE PROCEDURE

NOTICE: Figures 1 through 4 are for gasoline engines. Although the Servo Rod Assembly has a different shape and the Servo may be rotated on diesels, the service procedure remains the same.

1. Raise hood and install a fender cover on the left fender.

2. Examine the Cruise Control Servo. If the Bushing in the Bail of the Servo looks like it was formed in place (a permanent part of the Bail Assembly - see Figure 1.) , go directly to Step (12) and install a Campaign Identification Label.

If the Bushing is a "snap-in" bushing (with tabs) as shown in View "B" of Figure 2, continue to Step (3).

3. Disconnect any electrical and hose connections, if necessary, to the air cleaner and remove air cleaner assembly.

4. Before removing the Spring Retainer from its adjustment hole in the Servo Rod Assembly, scribe a mark on the rod next to the hole to identify where the Spring Retainer is to be reinstalled (see Figure 2).

5. Remove the Spring Retainer. Do NOT remove the "Z" pin.

6. Align the "Z" pin with the rod as shown in View "All of Figure 2.,, then slide the rod rearward out of the bail (it may also be necessary to slightly collapse the Servo diaphragm and move the Bail forward).

Pinch the Bushing flange with a pair of pliers and remove the Bushing from the Bail. The Bushing may not be in the Bail hole as originally installed; it may be free to move on the Servo Rod Assembly. Remove and discard the old Bushing.

7. If the Servo Bail hole has a burr, file off the burr so that the Bail surface is flat on both sides.

8. Obtain Bushing Kit (P/N 25111444). Install the Bushing onto the Bail as shown in Figure 3, so that the two tabs snap firmly in place. If the bail is bent (or twisted) so that the new Bushing will not easily snap into place on the Bail (as shown in Figure 3), straighten the Bail as necessary.

9. Install the Clip over the Bushing and Bail as shown in Figures 3 & 4. Reinstall the Servo Rod Assembly through the new Bushing by positioning the "Z" pin as shown in View "A" of Figure 2. Reinstall the spring retainer in the original (marked) hole in the rod, pointing the spring retainer in the direction shown in Figure 4.

If the Servo Rod Assembly is missing the "Z" pin, install a second Spring Retainer in the end hole normally occupied by the "Z" pin.

10. Ensure that the throttle mechanism will return fully to the idle position.

11. Reinstall the air cleaner assembly and reconnect hose and electrical connections as may be appropriate.

12. Install a Campaign Identification Label, remove fender cover from left fender, and close hood.

CAMPAIGN IDENTIFICATION LABEL

Each label provides space to print the campaign number, and the five (5) digit dealer code of the dealer performing the campaign. Insert this information with a typewriter or ballpoint pen. When installing label, clean and dry the surface of the radiator support tie bar and apply the campaign label where it is readily visible.

PARTS INFORMATION

To ensure that the parts your dealership may require are obtained as soon as possible, order them from GM Service Parts Operations (GMSPO) on a C.I.O. order, with NO special instruction code, but order on an advise code (2). Use the following part number:

Description Part Number Quantity Per Vehicle ----------- ----------- ---------------------- Bushing Kit 25111444 1

WARRANTY CLAIM INFORMATION

PC PART-NO. TOT-PTS TC LAB-OP LHRS ST SUBLET -- ------- ------- -- ------ ---- -- ------ Inspect Cruise Control Servo Bail Only 96 V5470 .2* --- ---

Inspect Cruise Control Servo Bail and Install Bushing Kit 96 V5471 .2* --- ---

* .1 hour for clerical administration may be added to the above operation.

Parts allowance: Current dealer price, plus 30% allowance for handling.

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.