New Oil Pump Assembly

SUBJECT:

New Oil Pump Assembly
TRANSMISSION APPLICATIONS:

1987 THM 700-R4 (MD8)
TRANSMISSION MODELS:

All Models

Figure 19 - Oil Pump Assembly:

CHANGE TO ASSEMBLY COMPONENTS:

^ Increase of 3 pump vanes, from 7 to 10 vanes (215, Figure 19) page 18.

^ New oil pump rotor (214) and rotor guide (213) to accommodate additional vanes.

^ Elimination of cup plug (244) on models using an auxiliary valve body assembly (see information contained in this Bulletin on page 4 "Major Component Changed" section).
DATE OF CHANGE:

October 28, 1986, Julian Date 301, for all 1987 THM 700-R4 transmission models. During the production of 1986 and early 1987 models, up to October 28, 1986, only some transmission assemblies used the 10 vane assembly. All 1987 Service Replacement Transmission Assemblies (SRTA) models have the new oil pump assembly.


SERVICE ACTION:

When using the new pump cover (217) inspect for cup plug (244). Cup plug must be present for transmissions not using an auxiliary valve body. The cup plug should be removed for assembly of feed tube (96) on transmissions that use an auxiliary valve body.


SERVICE PARTS INFORMATION:

Part Number Description

8649964 Pump Body Assembly Complete (1985-1987 models)

8649951-8649955 Selective Vane Ring Packages (1987 models)

8649950 Pump Body Assembly Complete (1985-1986 models)
(These pump bodies are to be used until stock is depleted unless noise condition is exhibited)


NOTE:

The pump body and pump cover assemblies used on 1982 through 1984 transmissions are NOT serviced separately.