A/T Oil Pump/Rotor and Slide - Revised Part Numbers
Number: 86-151Section: 7A
Date: Sept. 1986
Subject: 1980-86 THM 125/125C UPDATED SERVICE PART NUMBERS FOR OIL PUMP ROTOR AND SLIDE
MODEL AND YEAR: 1980-1986 MODELS WITH 125/125C TRANSMISSION
TO: ALL CHEVROLET DEALERS
This bulletin supercedes Chevrolet Dealer Information Bulletin 83-I-90 (dated July, 1983) Section VII C, 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:
FIGURE 1 - MICROMETER MEASUREMENT OF SLIDE OR ROTOR THICKNESS:
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