A/T - Evaluating Peened Spacer Plates

91chevy22

Number: 91-396-7A

Section: 7A

Date: AUGUST 1991

Corporate Bulletin No.: 177120


Subject: EVALUATING PEENED SPACER PLATES


Model and Year: 1982-91 ALL PASSENGER CARS AND TRUCKS WITH AUTOMATIC
TRANSAXLES AND TRANSMISSIONS (EXCEPT GEO)


TRANSMISSIONS APPLICATIONS:

All HYDRA-MATIC Automatic Transmissions and Transaxles


SUBJECT:

Evaluating Peened Spacer Plates (Service Information)


TRANSMISSION MODELS:

All


VEHICLE APPLICATIONS:

All Vehicles Using HYDRA-MATIC Automatic Transmissions and Transaxles


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.