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DISASSEMBLY OF THE OIL PUMP NOTE: If the transmission already has an “A4” pump, (refer to STEP 43 regarding proper identification of the pump) disassemble to determine its condition. Reassemble or replace as appropriate. NOTE: If the pump is not identifiable as part no. 181199A4 as described in STEP 43, replace it with a new pump from NAPO. It will not be necessary (and is not recommended) to disassemble a new pump; however, before proceeding with the transmision rebuild, it is advisable to disassemble the original (used) pump even if it is not going to be re-used. Check for scoring of the housing and suppor t by the gears. Check for excessive wear on the gear teeth. Check for looseness and excessive wear of the small gear bearing and supporting shaft. If any of the conditions are extreme, the charge pump was in the process of failing and has contaminated the transmission system with metal par ticles. If this has happened, also replace the torque converter and oil cooler. These must be ordered separately from NAPO.
STEP 312
BP95F252 Remove the two Allen head screws which fasten the pump support to the pump housing.
STEP 313
STEP 311
BP95F253 Separate the pump support from the pump housing. BP95F251
STEP 314
Remove the O-ring carefully. This part is NOT included in the overhaul or update kits. If necessary, replace with a new Oring from NAPO.
BP95F254 Remove the large gear from the pump housing.
Bur 7-54022
Issued 10-97
Printed in U.S.A.
