A/T Oil Cooler - Updated Flushing Procedure: Overview

Number: 86-164

Section: 7A
Date: Sept. 1986
SUBJECT: 1987 SERVICE MANUAL PROCEDURE UPDATE ALL THM TRANSMISSIONS/TRANSAXLES OIL COOLER FLUSHING PROCEDURE


MODEL AND YEAR: ALL MODELS


TO: ALL CHEVROLET DEALERS


NOTICE: This bulletin supersedes all transmission oil cooler flushing information previously published in Dealer Service Bulletins, and the THM 440-T4 Service Replacement Transmission Assembly (SRTA) Booklet dated August, 1985.

FIGURE 1 - COOLER FLUSHING TOOL, KENT-MOORE NUMBER J35944:

Transmission oil cooler flushing must be performed whenever a transmission/transaxle is removed for service. It is essential to flush the oil cooler after SRTA installation, major overhaul, if fluid contamination is suspected, or in any case of pump or torque converter replacement. A new, essential cooler flushing tool, Kent-Moore Number J 35944 (Refer to Figure 1), has been developed to properly flush the oil cooler and will be shipped to GM dealers by December, 1986. Time allowance for performing the cooler flushing procedure will be included in specific 1987 Labor Time Guide Operations. When using 1986 and prior Labor Time Guides, add 0.6 hours for cooler flushing to the recondition or SRTA replacement time allowances.
To insure complete transmission/transaxle system service, it is recommended that the flush procedure be performed after the overhauled or replacement assembly has been reinstalled in the vehicle.
The service procedure steps for oil cooler flushing are as follows: