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bigugly82 09-02-2006 01:17 AM

B 2 Piston
:book: Has anyone replaced a B2 piston? I think I may attempt it to resurrect the 300 D. Is it do-able by a novice?

kmaysob 09-02-2006 04:53 AM

very easy. the hard part is getting the little clip out to take the cover off. be ready to get covered in tranny fluid.

carusle 09-02-2006 11:19 AM

bigugly82 09-02-2006 02:54 PM

thanks carusle! I'll let you know how it goes.

mplafleur 04-07-2009 12:59 PM

I've got leaky cover. Can the seal for the cover be replaced without having to worry that the pushrod is not engaging the brake band since I will not be removing the piston?

tbomachines 04-07-2009 01:35 PM

Yup, there's plenty of documentation on it online. For me the hardest part was pulling out the seal holding in the B2 bushing. I destroyed the #@&^ thing, had to order another one through MB while my car was on jackstands. You'll need the B2 piston, nylon B2 bushing, and the B2 bushing seal just to be safe. Bushing & seal were under $10. I'll try and get part numbers for you if my webmaill server decides to work one of these days :(.

I also hear it is easier to remove the valve body and tap out the old bushing, I just yanked it out through the B2 opening. Getting the circular clip off wasn't too bad - the trick is to wedge something in between the trans tunnel and B2 cover, insert a flathead screwdriver at about 5 o'clock and pop it out. It was moderately harder to get back in while depressing the cover. Overall an easy job, just messy and easy to contaminate with dirt.

Oh hey this thread was 3 years old....whoops. Oh well. I'd definitely take it out to make sure. It's really not that hard--good time to make sure you've got the nylon bushing too.

mplafleur 04-07-2009 10:32 PM

This trans was fully rebuilt and never filled let alone driven. I believe the seal for the cover was damaged or knocked out of place when it was installed. I need to just replace that seal and that's all.

tbomachines 04-09-2009 02:26 AM

Is the transmission in the car? If it is not, it would be easier pulling the whole piston. If it is in the car, you could try to lodge something in between the cover and trans tunnel to keep the cover depressed, that would be your only chance at getting at the o-ring, but I believe it is too far in there to be removed without taking off the cover. I haven't crawled under the car to see if that method is do-able yet. See post #3, exact job you want to do.

mplafleur 04-09-2009 08:09 AM

It looks doable according to Diesel911 here:

All I need to do is replace that red o-ring.

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