A/T - Modulator Valve Buzz Noise
87olds4SUBJECT MODULATOR VALVE BUZZ NOISE NUMBER: 87-T-41
1987 CUTLASS CIERA, DELTA 88, DATE: August 21, 1987
NINETY-EIGHT AND TORONADO MODELS WITH THM 440-T4 (ME9) TRANSAXLES
MODELS/YEARS BUILT PRIOR TO FEBRUARY 1, 1987
SECTION: 7A
(JULIAN DATE 032)
FIGURE 1 - THM 440-T4 TRANSAXLE IDENTIFICATION INFORMATION:
Bulletin Covers: (Figure 1)
Modulator valve buzz noise can be caused by a missing orificed cup plug in the modulator circuit of the channel plate for transaxles built prior to February 1, 1987 (Julian Date 032).
FIGURE 2:
Service Action: (Figure 2)
Remove the transaxle from the vehicle and remove the channel plate (404) from the transaxle. Install the orificed cup plug (437) from the service package listed in "Service Parts Information". The cup plug is properly installed at 0.0 - 05 mm (.020") below the channel plate machined surface and must be staked securely.
Service Parts Information:
Service package number 8646987 includes the following parts:
- Orificed cup plug
- Lower channel plate gasket
- Upper channel plate gasket
- Modulator port gasket
- Instruction sheet
Service Manual Reference:
Refer to the THM 440-T4 automatic transaxle unit repair section in the appropriate model year service manual for repair procedures.