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1985 500sel
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19 Posts
Discussion Starter · #1 ·
Hey I'm new to this forum. I have a problem with my 500sel. My trani stopped working it only goes on reverse.[xx(]. I went and bought a rebuilt trani for $1175.00. wich by the way it looks beautiful. Does any one have any idea of what went wrong with my old trani. Oh and I still need to install the new trani.
 

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w126 420 sel
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622 Posts
i had a similar problem three weeks ago. some say its the b2 piston, but we went ahead and got a rebuilt tranny. the car is totally different, it feels alot tighter and more solid. good luck with yours and welcome!
 

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1991 300SE 250,000KM Award Recipient
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468 Posts
Odds are very high that it is the B2 piston. It can be replaced from outside of the trans and if everything was OK before it quit that should be all you need. It's worth it to try the updated apply piston first before you pull the trans. The part is less than $60 so it's worth it. Drain the trans and pull the round cover from the drivers side of the trans and you will probably see the piston with the center of it punched out. If that's the case you can just replace it and off you go. Good luck.
 

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Depends on the day!
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13,337 Posts
If you can get B2 pistons for 60$ Please tell me where!

There's a good chance he took out he has taken out the B2 band as well..

Jonathan
 

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1991 300SE 250,000KM Award Recipient
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468 Posts
Jonathan, that should have been around $160 not $60. Have you had experience with the band going too? The one I did just had a bad apply piston. But of course I had already pulled and disassembled the trans up to the band before I pulled the piston out and saw what had happened. I freshened up the trans with new frictions while I was there and everything worked good after that. I am just trying to save this guy some labor if in fact it is just the piston.

Al
 

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Depends on the day!
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13,337 Posts
Hey there Al,
160 is more like it[8D]

I've found that as they transmissions wear, the B2 piston over compensates and travels further then it was Really designed too.. In doing so it wears out the band, causing it to fail.

Anywho, that's just what I've come across on rare occasion..!

Jonatan
 
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