Out of curiosity, what causes a B2 piston to break? I spoke to a inde Mercedes Repair shop, and they say:

"Oh...Theres something wrong with the transmission because the B2 piston is seriously damaged blah blah blah $2,100 to rebuild trans or blah blah blah Something is broken in the trans blah blah"

Before the B2 failed my trans is shifting fine, it downs shifts and up shifts smoothly, and engages every gear properly. So back to the question, What causes a B2 piston to break?

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Current Garage
2008 Mercedes GL320 CDI 188k mi Repair/Work in progress
1994 S350 160k mi Garage Queen & prepping for repairs
2005 E320 CDI 203k mi Healthy & Daily Driver
1994 S350 357k mi Retried as parts car
1984 300TD 214k mi Blown OM617 Poss OM603 Swap??

Sold
1987 300SDL 200K+
1994 S320 181K mi
2008 E320 Bluetec 127k mi
1999 S420 130K mi
1980 240D 360k mi
15+ Others that has come, stay and gone

GONE, BUT NOT FORGOTTEN
1995 E320 SE 220k mi
1984 300SD 350k mi

Weakness at the dyaxial flange often causes this, luck of the draw.

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Cheers!
Scott McPhee

1987 300D

which car?

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'85 300D Cal 280,000 miles
'14 GLK 350 60000 miles

My 1984 300SD, yeah it broke into 3 peices from the looks of the dyaxial flange failed... Thx goodness i am a DIY mech or i would have been overpaying for something small and cheap

__________________
Current Garage
2008 Mercedes GL320 CDI 188k mi Repair/Work in progress
1994 S350 160k mi Garage Queen & prepping for repairs
2005 E320 CDI 203k mi Healthy & Daily Driver
1994 S350 357k mi Retried as parts car
1984 300TD 214k mi Blown OM617 Poss OM603 Swap??

Sold
1987 300SDL 200K+
1994 S320 181K mi
2008 E320 Bluetec 127k mi
1999 S420 130K mi
1980 240D 360k mi
15+ Others that has come, stay and gone

GONE, BUT NOT FORGOTTEN
1995 E320 SE 220k mi
1984 300SD 350k mi

can someone please explain this dyaxial flange in english? I always thought it was the metal bushing creating friction and grooving in the piston, then it would ultimately become too much to overcome and the thing would break from sheer friction or binding at the bushing. This is why they updated the bushing with a nylon piece so that it will not gouge the B2 piston.

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TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.

Past: 135i, GTI, 300E, 300SD, 300SD, Stealth

Worried that someone else was going to break on my car, I googled "B2 Piston" and found this:
http://www.mbz.org/articles/transmission/b2/why/

(you gotta scroll way down for some reason)

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'95 Geo Metro 3-cyl 5-speed
'97 Geo Metro 3-cyl 5-speed x2
'81 Mercedes 240D 4-speed manual RIP