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  #1  
Old 01-15-2010, 03:16 PM
Actros617's Avatar
Ich fahre dieseltypen
 
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What Causes a B2 piston to break.

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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  #2  
Old 01-15-2010, 06:13 PM
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Weakness at the dyaxial flange often causes this, luck of the draw.
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  #3  
Old 01-15-2010, 06:27 PM
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which car?
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Old 01-15-2010, 06:44 PM
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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
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Benz's in our garage
1994 S350 357k mi

Sold
1987 300SDL 200K+
1994 S320 181K mi
2008 E320 Bluetec 127k mi
1999 S420 130K mi
1980 240D 360k mi


RIP SECTION

1995 E320 Special Edition [Rear ended]
1984 300SD [Head on collision]
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  #5  
Old 01-15-2010, 08:52 PM
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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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  #6  
Old 01-15-2010, 11:54 PM
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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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