Campaign - Starter Motor Pinion Stop Fails
GMC NUMBER: 94-C-09GROUP: 6D Engine Electrical
DATE: January 1994
SUBJECT:
STARTER MOTOR PINION STOP
MODELS:
1994 S/T, C/K, M/L, AND G TRUCKS EQUIPPED WITH DELCO REMY STARTERS
IMPORTANT!
THIS BULLETIN SUPPLEMENTS INFORMATION IN DCS 93SV0210, DATED DECEMBER 23, 1993.
General motors has determined that certain 1994 S/T, C/K, M/L, and G trucks may have improperly heat treated pinion stop collars. This condition may result in part failure causing slow engine crank speeds or an engine no start condition.
To prevent this condition from occurring, dealers are to inspect and repair certain starter motors from the vehicles identified below. Starter motors with date codes of N093, N103, N113, N123, N133, N153, and N163 are to be repaired by replacing the pinion stop collar and retaining ring. No repairs are necessary on motors that fall outside of these date codes.
VEHICLES INVOLVED
Involved are certain 1994 S/T, C/K, M/L, and G trucks built within the VIN breakpoints shown.
DEALER CAMPAIGN RESPONSIBILITY
All unsold vehicles in dealers possession and subject to this campaign must be held and inspected/repaired per the service procedure of this campaign bulletin before owners take possession of these vehicles.
Dealers are to service all vehicles subject to this campaign at no charge to owners, regardless of mileage, age of vehicle, or ownership, from this time forward.
Whenever a vehicle subject to this campaign enters your vehicle inventory, or is in your dealership for service in the future, please take the steps necessary to be sure the campaign correction has been made before selling or releasing the vehicle.
OWNER NOTIFICATION
Owners will be notified of this campaign on their vehicles by GMC truck division (see copy of owner letter included with this bulletin). A listing of owner names and addresses has been furnished to the involved dealers to enable dealers to follow up with owners involved in this campaign. This listing may contain owner names and addresses obtained from state motor vehicle registration records. The use of such motor vehicle registration data for any other purpose is a violation of law in several states. Accordingly, you are urged to limit the use of this listing to this campaign.
SERVICE PROCEDURE
INSPECTION PROCEDURE
Starter & Solenoid:
1. All vehicles within the breakpoints should be inspected to determine the starter motor date codes. The date codes are imprinted on the upper half of a tag located on the motor end of the starter. The tag information is read upside down as viewed from the bottom.
2. a) Most vehicles may be inspected by utilizing a mirror, flashlight and/or use of a pliable material such as modeling clay to make an impression of the date code. After making an impression, read the code in a mirror.
b) Some vehicles equipped with oil coolers (T trucks) will require starter motor removal to read the date codes per section 6D2 of the service manual.
3. Remove all starters per instructions in the service manual section 6D2 with date codes of N093, N103, N113, N123, N133, N153, & N163 and perform service procedure. (Note: Remove negative cable from battery).
4. Reinstall starter motors per instructions in service manual, section 6D2.
5. Install campaign identification label on all vehicles inspected and/or serviced.
SERVICE PROCEDURE TO REPLACE PINION STOP COLLAR
1. Disconnect negative battery cable.
2. Remove field lead attaching screw from solenoid terminal.
3. Loosen but do not remove through bolts in the starter motor assembly. Do not separate the commutator end and frame.
4. Separate the frame with the armature inside from the housing.
5. Remove the thrust collar from the end of the shaft if it is not stuck to the housing.
6. Use care in removing and installing the retaining ring to prevent scratching or damaging the armature shaft.
7. Remove the pinion stop retaining ring first prying the pinion stop collar off the ring. Pry the pinion stop ring off of the armature with a small screw driver. Discard ring.
8. Remove pinion stop collar from armature shaft. Discard collar.
9. Install new pinion stop collar on armature shaft. Flat side goes towards pinion.
10. Install new retaining ring onto armature shaft and seat it in the shaft groove. Use due care not to damage the armature shaft.
11. Install thrust collar onto armature shaft with small flange toward retaining ring. Use two pliers to squeeze pinion stop collar and the thrust collar to seat the stop collar on the retaining ring.
12. Assemble the frame, armature, and drive assembly into the housing. Ensure the shift lever is engaged with the drive assembly. Ensure the armature shaft is engaged with the housing bearing. Tighten the through bolts.
13. Install starter field lead to solenoid.
PARTS INFORMATION
General motors service parts operation (GMSPO) has limited quantaties of parts which are in merchandised packages of 10 pieces each. Please use VIP CIO order form and do not over order to insure availability to all vehicles involved.
Insure that removed parts are disposed of to prevent potential reuse.
WARRANTY INFORMATION
List one applicable labor operation. A separate repair order must be used for each vehicle. A complete warranty claim is to be kept as a permanent record of completion.
CAMPAIGN IDENTIFICATION LABEL
Each vehicle corrected in accordance with the instructions outlined in this product campaign bulletin will require a "campaign identification label". Each label provides a space to include the campaign number and five (5) digit dealer code of the dealer performing the campaign service. This information may be inserted with a typewriter or ball point pen.
Each "Campaign Identification Label" is to be located on the radiator core support in an area which will be visible when the vehicle is brought in for periodic servicing by the owner.
Apply "Campaign Identification Label" only on a clean, dry surface.
ADMINISTRATIVE PROCEDURE
Procedures covering this campaign are outlined in section V of your dealership's "GMC Truck Warranty Claims Processing Manual" # P9119.