TSB 91-7-37: A/T - Evaluating Peened Spacer Plates

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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.