A/T - Updated Service Part Numbers for Oil Pumps
Bulletin 86-7125-7Date Sept. '86
Ref. No. 86-161-7125
SUBJECT: 1980-1986 THM 125/125C UPDATED SERVICE PART NUMBERS FOR OIL PUMP ROTOR AND SLIDE
MODELS AFFECTED: ALL EQUIPPED WITH THM 125/125C TRANSAXLES
NOTE: This bulletin supersedes Buick Service Bulletin 83-133, which should be destroyed.
When servicing the oil pump rotor and slide on a THM 125/125C transaxle, refer to the appropriate Service Manual, which describes the following procedure:
USE MICROMETER TO MEASURE OIL PUMP SLIDE AND ROTOR:
Use a micrometer to measure the original pump rotor and/or slide thickness. Refer to Figure 1. Take measurement on a flat, undamaged surface.
Use the original part measurement to select the proper service package from the following charts:
1980-1981 THM 125 (Order rotor and slide separately)
ROTOR (MM) PART NUMBER SLIDE (MM) PART NUMBER
17.943-17.955 8653961 17.955-17.967 8631800
17.956-17.968 8653962 17.968-17.980 8631801
17.969-17.981 8653963 17.981-17.993 8631802
17.982-17.994 8653964 17.994-18.006 8631803
17.995-18.008 8653965 18.007-18.020 8631804
1982-1986 THM 125C (Order rotor and slide as complete package).
ROTOR (MM) SERVICE PACKAGE NUMBER
17.943-17.956 8652903
17.956-17.969 8652904
17.969-17.982 8652905
17.917-17.930 8652906
17.930-17.943 8652907