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  #1  
Old 09-02-2006, 12:17 AM
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B 2 Piston

Has anyone replaced a B2 piston? I think I may attempt it to resurrect the 300 D. Is it do-able by a novice?
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  #2  
Old 09-02-2006, 03:53 AM
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very easy. the hard part is getting the little clip out to take the cover off. be ready to get covered in tranny fluid.
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  #3  
Old 09-02-2006, 10:19 AM
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http://dieselgiant.com/Mercedesb2pistonsealreplacementl.htm
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  #4  
Old 09-02-2006, 01:54 PM
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thanks carusle! I'll let you know how it goes.
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  #5  
Old 04-07-2009, 11:59 AM
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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?
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'05 E320 CDI - 86,000 miles
'86 300SDL - 360,000 miles
'85 300SD - 150,000 miles (sold)
'89 190D - 120,000 miles (sold)
'85 300SD - 317,000 miles (sold)
'98 ML320 - 270,000 miles (sold)
'75 300D - 170,000 miles (sold)
'83 Harley Davidson FLTC (Broken again) :-(
'61 Plymouth Valiant - 60k mikes
2004 Papillon (Oliver)
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2009 Welsh Corgi (Buba)

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  #6  
Old 04-07-2009, 12:35 PM
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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.
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Last edited by tbomachines; 04-07-2009 at 12:38 PM. Reason: how old the thread was
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  #7  
Old 04-07-2009, 09:32 PM
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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.
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Michael LaFleur

'05 E320 CDI - 86,000 miles
'86 300SDL - 360,000 miles
'85 300SD - 150,000 miles (sold)
'89 190D - 120,000 miles (sold)
'85 300SD - 317,000 miles (sold)
'98 ML320 - 270,000 miles (sold)
'75 300D - 170,000 miles (sold)
'83 Harley Davidson FLTC (Broken again) :-(
'61 Plymouth Valiant - 60k mikes
2004 Papillon (Oliver)
2005 Tzitzu (Griffon)
2009 Welsh Corgi (Buba)

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  #8  
Old 04-09-2009, 01:26 AM
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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.
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  #9  
Old 04-09-2009, 07:09 AM
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It looks doable according to Diesel911 here:




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

'05 E320 CDI - 86,000 miles
'86 300SDL - 360,000 miles
'85 300SD - 150,000 miles (sold)
'89 190D - 120,000 miles (sold)
'85 300SD - 317,000 miles (sold)
'98 ML320 - 270,000 miles (sold)
'75 300D - 170,000 miles (sold)
'83 Harley Davidson FLTC (Broken again) :-(
'61 Plymouth Valiant - 60k mikes
2004 Papillon (Oliver)
2005 Tzitzu (Griffon)
2009 Welsh Corgi (Buba)

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