How to Stop Leaking Transmission Fluid?


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1, For gearbox oil leakage first look at the official to give the technical bulletin:Area leaks on BMW 6HP and 8HP automatic transmissions
Involving vehicles: E53, E60, E61, E63, E64, E65, E66, E67, E68, E70, E71, E72, E81, E82, E83, E84, E85, E86, E87, E88, E89, E90, E91, E92 E93 F01 F02 F03 F04 F06 F07 F10 F11 F12 F13 F18 F20 F25 F30 F31

Fault phenomenon:
In an automatic transmission, transmission oil around the oil pan seal leaks or condenses into droplets. There are visible spots or smudges on the floor trim.
The involved automatic transmissions: 6HP19TUE (6HP21), 6HP26TUE (6HP28), 8HP45, 8HP45 and 8HP90.

Possible causes of dirt formation in the oil pan area:
(1) Condensate of air conditioner
(2) Crankshaft radial shaft seal leakage
(3) Torque converter side transmission radial shaft seal leakage
(4) Output flange radial shaft seal leak
(5) Leakage of the oil pan
(6) Transmission plug leakage
(7) Selection shaft leakage
(8) Leakage of X-drive vehicle splitter
(9) Front axle differential leak

The leakage is serious, and a large number of droplets may accumulate at the back of the oil sump and may even leak.
(1) First check whether the droplets on the oil pan are condensate or oil (puff and smell between fingers). If it is water, it may be condensed water in the drain hose of the air conditioner. This is a normal phenomenon due to the design conditions.
(2) Check the trajectory of oil leakage to determine the location of the leak. Take pictures of the leaked area before starting repairs.
(3) Check that the bolted connection in the leakage area is tightened with the correct tightening torque (see ISSTA/D) and retightened if necessary.
(4) Clean the transmission with BMW Engine Cleaner (BMW part number 83 12 0 026958).
(5) Test run for about 30 minutes, then close the vehicle and cool it for about 30 minutes.
(6) Inspect the transmission (oil pan, output flange, rubber cover on the torque converter housing in the transmission case) for leaks and check with a clean paper towel if necessary. If oil drops are no longer present, the transmission is judged technically correct and no further maintenance is required. Allows a film of oil on the seal ring.

If leakage continues to occur, make additional photos of the leaked area and send it to with the photo before repair.
Replace only the affected parts according to the relevant maintenance instructions or PuMA measures:
(1) Crankshaft Radial Shaft Seal Ring – Hours No. 11 14 005 (front), 1114151 (rear)
(2) Replacement of torque converter side transmission radial shaft seal ring – Work number 2431013
(3) Output flange side transmission radial shaft seal leakage – Work number 2413015
(4) Leak in oil pan – Hours number 24 11014
(5) Transmission Plug Leakage – No Time Code
(6) Transmission Case ((8HP45) Sealing Sleeve Leakage – Work Number 2434022
(7) Leakage at the seal joint between the mechanical electronic control system and the transmission (6HP26) – PuMA18596825
(8) Selection shaft leakage, working hours number (8HP45 only) 24 14 004
(9) X-drive vehicle transfer case leakage PuMA 50646312
(10) FRONT BRIDGE DIFFERENTIAL LEAKAGE -PuMA47325247 After repairing the transmission, thoroughly clean the transmission oil/oil residue.

2. Solution: