If ATF smells burnt and contains friction liner abrasion, the transmission has to be repaired, the torque converter drained and the cooler flushed.
The torque converter has to be replaced, if there are metal burrs in the ATF sump.
A sealing surface must be made on the adapter subsequently. Open standard bore to 10 mm diameter and drill approx. 5 mm deep. Then counter bore sealing surface with a 90°countersink.
Mount auxiliary hose from ATF filler (see Special Tool Catalog, Workshop Equipment Group) and adapter, Part No. 087.409.057 B, on return line and flush cooler with ATF. Catch ATF running out of feed line.
A = Adapter
Part No. 087.409.057 B
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