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Old 02-22-2018, 08:47 AM
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Join Date: Jan 2018
Posts: 18
w124 722.4 transmission problem

Hello, yesterday when i was driving to work all of my cars forward gears disappeared, i read that it's probably the b2 piston fault. I will try to take the B2 piston ou this weekend, my question is, if it's not broken then can i just change seals on the piston or should i just change the whole thing. The seal costs about 8euros and the piston is 200 so i'd be happy if wouldn't have to spend alot of money on fixing it.

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Old 02-22-2018, 03:33 PM
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Join Date: Jan 2018
Posts: 18
i got the B2 piston out, it doesn't look broken, can a worn seal cause this or what else could cause this problem ?
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Old 02-22-2018, 05:10 PM
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Join Date: Jan 2018
Posts: 259
Drop the pan and see if you have metal and/or lining in there. This is kind of like saying, "My engine doesn't run, what's wrong?" There are many different things that could have gone awry.... pump, drum seals, linings stripped, converter, etc... If it has lining (looks sort of like paper gasket material) or shards of metal in tge pan, it's rebuild time.
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Old 02-24-2018, 02:30 PM
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Join Date: May 2012
Location: El Dorado Hills, CA, USA
Posts: 418
Yes, the black seal gets hard and brittle, and the waves on the B2 piston shaft do it too..

Note the direction of the dog bone. It needs to go in the same way...

How to Replace Your Oil Cooler Lines

Understand the Brake-Band can be burned/damaged too..

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Old 02-26-2018, 02:51 AM
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Join Date: Jan 2018
Posts: 18
I got the problem fixed, when i dropped the pan then foun a smaller dogbone on the filter, i replaced the dogbone with a longer one, changed seals, filter and oil and it drives perfectly again. Thank you for the suggestions

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