LEMON Manuals: Even more car manuals for everyone
Home >> GMC >> 1995 >> Forward Control 4.3 Z, Standard >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission Overhaul - 4L80-E >> Transmission Reassembly >> Oil Pump

Oil Pump

  1. Install Locating Pin (J-25025-1) at 12 o'clock position. Install oil pump cover gasket. See Fig 1. Install selective thrust washer. Using Handle (J-37789), install oil pump assembly. See Fig 2. Ensure turbine shaft spins free. Tighten oil pump mounting bolts.
  2. Using Dial Indicator (J-8001), check front unit end play. See Figure. Front unit end play should be .004-.022" (.10-.56 mm). If front unit end play is not correct, select proper size thrust washer. See FRONT END PLAY THRUST WASHER IDENTIFICATION  table. If necessary, remove oil pump assembly to change selective thrust washer.
Fig 1: Installing Oil Pump Gasket
G92D13865Courtesy of GENERAL MOTORS CORP.
Fig 2: Installing Oil Pump & Thrust Washer
G92E13866Courtesy of GENERAL MOTORS CORP.
FRONT END PLAY THRUST WASHER IDENTIFICATION

Identification Thickness
Blue .057-.061" (1.45-1.55 mm)
Red .073-.077" (1.85-1.96 mm)
Brown .089-.093" (2.26-2.36 mm)
Green .105-.109" (2.67-2.77 mm)
Plain .121-.125" (3.07-3.18 mm)