A/T - Evaluating Peened Spacer Plates

91pontiac07

Bulletin Number: 91-7-37
Reference Number: 177120
Publish Date: 8/91




Subject: EVALUATING PEENED SPACER PLATES
ALL AUTOMATIC TRANSAXLES AND
AUTOMATIC TRANSMISSIONS
(SERVICE INFORMATION)

Models
Affected: 1982-1991 ALL MODELS


BULLETIN COVERS: Some spacer plate peening is considered acceptable and preferred because it can help seat the check ball. This bulletin will help you decide if a spacer plate needs to be replaced due to a peening condition.

SERVICE PROCEDURE: The following two procedures can help determine if the spacer plate can be reused. The following must be performed at all check-ball locations.

Figure 1:

1. The spacer plate must be inspected 100% for raised material on the opposite side of the check-ball seat (see Figure 1). If the material on the opposite side is raised, the peening is too severe and the spacer plate must be replaced.

Figure 2:

2. To verify that the spacer plate is peening evenly and the ball is sealing correctly, seat the check-ball on the spacer plate. Shine a beam of light on the opposite side and inspect for light between the spacer plate and check-ball (see Figure 2). No trace of light should be present. If light can be seen, a proper seal does not exist, and the spacer plate must be replaced.


SERVICE MANUAL REFERENCE:

Refer to the HYDRA-MATIC Automatic Transaxle/Transmission Diagnosis or Unit Repair section of your service manual for proper check-ball locations and functions.