I wonder if you experts are still out there so many years since.
I have a 79 TD
The classic B2 thing happened to me -- no forward gears but reverse works
I have the same piston pictured and described above, with the metal seal ring.
So far I have everything out except the piston, which doesn't seem to be able to move.
Do you think the problem lies in its being stuck?
Or does the metal ring make it hard to move?
How would you advise me to get it out?

And for my sins, I damaged the yellow plastic hub cover when fiddling with the circlip. Would anyone know where I could get another like it?
Thanks
Dirk

hey starry,

i''m not sure if the same applies to your transmission, but on the 722.4 transmission, B2 piston removal was pretty straightforward. After removing the B2piston cover retaining clip, and dropping the valve body you should be able to push the B2 piston out from its bore which becomes accessible upon removing the valve body . if my memory serves me right, i was able to do so by hand.

good luck

I've stuck some pictures in this thread for the removal and refit of the B2 piston (along with the rest of the bits in a 722.118!)

722.118 Automatic transmission rebuild (Monster DIY)

If you've broken the plastic bits then my guess would be that that is game over for that part. If you're unsure you could post a picture - we might be able to help - however the general feeling here is not to add glue to a transmission environment...

My solution to your problem was to cut up yogurt pots.

__________________
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1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!

Thank you all for replying. Wow. Much needed shot in the arm after a sleepless night.

I am greatly encouraged to get going and do that transmission work myself.
The car is running so beautifully and I have put so much satisfying work into it already that it makes sense to just keep on going!

It is probably going to take me some weeks too, with many mistakes and questions. The yoghurt tub strips are brilliant.

The part that I have cooked is the little yellowish plastic cup-shaped perforated hood on the outermost side of the B2 piston pictured in the very early posts of this thread. It is loosely kept in place by a circlip. I'd be very glad if anyone has one knocking about.
Dirk

To the best of my (limited) knowledge that part isn't available to buy separately

According to the pdf file you'll find here

http://www.ganzeboom.net/images1/ganzeboom/parts/Mercedes/722.0,%20722.1,%20722.2.pdf

...you've got to buy the whole part (number 907)

Oh by the way the metal "piston ring" (number 195 in the PDF) should in my opinion be replaced. I hope the bore in the casing has survived. To have to fix that would be interesting!

__________________
1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!

Guide
MB# 1152771677
No Longer Available

Boot
MB# 1152721192
$16.50




.

Attached Thumbnails

 

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Did you try W.I.T. trans parts? Please double check the trans # = yours! No diagrams on their site (!) but you could call them; they seem to have everything! The entire trans case is only $100 from them! In my experience, everything that IS available from Fastlane is a bit cheaper here than from WIT.

-Tom

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Thanks for the above three posts. Much appreciated. Knowing I can get the boot I broke is the best news.


I have sourced a remanufactured piston so that is also a possibility (except that mine looks good from the outside).



It will take me the weekend to pull the trans (out in the street) and the first thing I'd have to check is the condition of the bore once I have the piston out.

First few baby steps into the unknown