Oil Pump Body Seal - Fluid Leaks
Number: 86-188Section: 7A
Date: OCT., 1986
Subject: FLUID LEAKS FROM THE OIL
PUMP BODY SEAL
Model and Year: 1984-86 VEHICLES WITH
700-R4 TRANSMISSION
TO: ALL CHEVROLET DEALERS
Fluid leaks from the oil pump body seal may be created by movement of the pump body bushing. If this condition is experienced, a new oil pump body should be installed.
To service a 1984 (after Julian date 180) through 1986 (Julian date 006) THM 700-R4 transmission, use a new Pump body assembly, part number 8649950. The new pump body has a stepped bore incorporated to assist in retention of the pump body bushing. It also is supplied with a new seal, part number 8648394 and a Helix seal retainer, part number 8654491 for improved sealing. The seal and retainer are available separately.
Transmission Identification Information:
For identification of the transmission and Julian date, refer to Figure 1.
OIL PUMP BODY:
OIL PUMP BODY:
Because of the stepped bore in the new oil pump body, the installation procedure and tool for the pump body bushing have been changed. Installation of a bushing in a stopped bore body requires use of the new Kent-Moore tool J 34196-12, refer to Figures 2 and 3. The removal procedure is the same as outlined in the service manual.