A/T - Service Procedure Update: Overview
Number 87-7-1 Date 9/86Subject: 1987 SERVICE PROCEDURE UPDATE ALL THM TRANSMISSIONS/TRANSAXLES OIL COOLER FLUSHING PROCEDURE
FIGURE 1 - FLUSHING TOOL:
ALL MODELS
NOTICE: THIS BULLETIN SUPERSEDES TRANSMISSION OIL COOLER FLUSHING PROCEDURE INFORMATION PUBLISHED IN BULLETIN 86-7-7 AND THE THM 440-T4 SERVICE REPLACEMENT TRANSMISSION ASSEMBLY (SRTA) BOOKLET DATED AUGUST, 1985.
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: