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  #31  
Old 12-20-2004, 09:17 PM
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Quote:
Originally Posted by lino
Well Gentlemen, it turns out that the B2 Piston I have in my car is in excellent condition and is the exact same one (same part number) as the one I bought from the MB dealer the other day. So I reinstalled my old one.

The B2 Band looked like it was fine as well. I dropped the transmission pan and the transmission fluid was burnt, you could smell a horrible odor from it. Also, there was metallic sprinkles in the pan.

Removing the B2 Piston took my mechanic less than 15 minutes and "YES" it can easily be done without removing the transmission. He just used his bare hands to remove and reinstall with no problems. No special tools or fabrication. Just move the transmission to one side and use a small block of wood to hold in place to give you some room to work. He had it all done in about 25 minutes.

I took pictures of the B2 Piston removal, but unfortunately I forgot to put the flash on in the camera settings so the pictures are not good quality. I did manage to take a couple with the flash after I realized. If anyone needs and pics just ask and I'll post the specific ones you require.

Verdict...My transmission is
I need a new transmission. I wasn't going to remove and take it apart to see what is wrong with it today. I just had the car towed home and called it a day. Riding in a tow truck 2 times in one day is enough for me.

Don't lose hope quite yet... could very likely be bad K2 clutches or even a K2 drum (at the very rear of the transmission). Twould be nice if we could figure out if it was taken out and worked over in the first place, or if the only thing worked over was you.
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  #32  
Old 12-20-2004, 11:31 PM
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Quote:
Originally Posted by BenzRepair
Don't lose hope quite yet... could very likely be bad K2 clutches or even a K2 drum (at the very rear of the transmission). Twould be nice if we could figure out if it was taken out and worked over in the first place, or if the only thing worked over was you.
2 questions:

1. Could you explain in more detail what you mean when you say not to lose hope quite yet...could very likely be bad K2 clutches or even a K2 drum (at the very rear of the transmission). Is this any easy fix?

2.Could you please explain.....It would be nice if we could figure out if it was taken out and worked over in the first place

Thank You

Here is the inner workings of the transmission:
Attached Thumbnails
B2 Piston W124-w4a020wonblack6jy.jpg  
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Last edited by whunter; 12-10-2009 at 11:23 AM. Reason: attached picture
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  #33  
Old 12-21-2004, 12:19 PM
Ta ra ra boom de ay
 
Join Date: Jun 2004
Location: Pittsburgh
Posts: 1,915
Quote:
Originally Posted by lino
I will definitely not rebuild myself since I don't have any experience. I haven't decided what i want to do yet. I will start thinking about options tomorrow. Today I think I'll just watch some tv to relax.
Quote:
Originally Posted by A264172
Lino,
Have you read this thread:
The ultimate DIY - or am I crazy ?
It does not apply to the B2 per say but contains a wealth of tranny info.
I think you could do it if you pursue the sources in that thread, assuming you have the time and patience.
Quote:
Originally Posted by lino
A nice drink woulds be nice considering I haven't had one in over 6 months.
Hope my offhanded suggestion was not inappropriate. If so, you have my apology.
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  #34  
Old 12-21-2004, 09:30 PM
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Quote:
Originally Posted by A264172

Hope my offhanded suggestion was not inappropriate. If so, you have my apology.

Your suggestion was not inappropriate, on the contrary it was a great idea. I just meant that it's been a while since I had a drink and you made me remember that I was overdue

Here's to you and your idea
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  #35  
Old 12-21-2004, 09:44 PM
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Quote:
Originally Posted by lino
Just move the transmission to one side and use a small block of wood to hold in place to give you some room to work.
lino - A little off subject, but do you have any idea how much room you get with this - is it like a half an inch? or two inches? or what? I'm curious because I'm getting ready to tackle a leak on the side of the transmission and I just can't get to it. I'm assuming he took off the transmission mount. Do you know if he also disconnected the flex disk?
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  #36  
Old 12-21-2004, 10:34 PM
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You probably get about 3 inches if I remember correctly. I'm not certain though.

What I remember is that he took off a clamp that had 2 bolts and he removed another 2 bolts from the left side of the catalytic converter only. It took him a little over 10 miutes in total to have the B2 Piston removed.

Here are some pics that are somewhat clear. I'm real sorry about the quality. This is why I didn't post them. I hope this helps you:

Clamp removed - 2 bolts and the other 2 bolts removed


Looking at the B2 Piston from the passenger side


B2 Piston cover removed


B2 Piston Cover


B2 Piston C-Clip removed


B2 Piston removed


B2 Piston - the one that came off of the car


B2 Piston exposed since cover and C-Clip have been removed and the block of wood is visible in the back


Another shot that shows the block of wood


Inside pan - burnt fluid and metallic specs
Attached Thumbnails
B2 Piston W124-dsc024675om.jpg   B2 Piston W124-dsc024703pb.jpg   B2 Piston W124-dsc024766ii.jpg   B2 Piston W124-dsc024754kt.jpg   B2 Piston W124-dsc024737hi.jpg  

B2 Piston W124-dsc024833hq.jpg   B2 Piston W124-dsc024795jt.jpg   B2 Piston W124-dsc024834co.jpg   B2 Piston W124-dsc024848ik.jpg   B2 Piston W124-dsc024906wt.jpg  

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Last edited by whunter; 12-10-2009 at 02:34 PM. Reason: attached pictures
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  #37  
Old 12-25-2004, 02:37 PM
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Lino, I think you and I have the same problem. Check out my own thread in the forum. I got billed for a complete rebuild, and it turns out that I only got a patch job, and the Mercedes dealer I took the car to for a subsequent diagnostic says I still need a complete rebuild.

The shop I went to is a Mercedes only independent, but they farm out the transmission work and it was never dyno tested; in fact, the outsourcing shop does not even have the equipment to do that. So, my advice is to make sure the shop actually has the equipment to test their work, that they actually will do a complete rebuild if they bill you for it. Shop around too. You can also buy a transmission rebuilt to factory specs from eurotransmissions.com for about $1250 net (swapping your old trans in), and pay about $450 in labor to have the old one taken out and the new one put in. I spoke to a couple of shops that use their transmissions, and they come highly recommended. Good luck.
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  #38  
Old 12-26-2004, 01:57 AM
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Location: KC, MO
Posts: 140
Quote:
Originally Posted by lino
2 questions:

1. Could you explain in more detail what you mean when you say not to lose hope quite yet...could very likely be bad K2 clutches or even a K2 drum (at the very rear of the transmission). Is this any easy fix?

2.Could you please explain.....It would be nice if we could figure out if it was taken out and worked over in the first place
K2 is at the rear of the transmission, and the K2 drum (#95) rides on a shaft (#101) at the rear of the tranny. If you buy a book (from ATSG, etc.), it will tell you how to pressure-test the drum/K2 clutches (after you remove the valve body). You have to remove ALL the parts in the transmission to get to the K2 drum.

If they took it out to rebuild, they probably screwed it up putting it back together; if they didn't remove it, then it has a problem which likely should have been taken care of as a result of the rebuild. Either way, however, they should be responsible for the problem.

That pan sludge is terrible for just having been rebuilt; that pic will go a long way in court, considering it was rebuilt. Might just tell them about one more chance you're gonna give them to get it right.
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Last edited by BenzRepair; 12-26-2004 at 02:06 AM.
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  #39  
Old 12-26-2004, 11:07 AM
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Thanks for the pictures. My leak is slightly in front of the middle pan bolt. It looks like the B2 piston is slightly to the rear of the middle bolt. I believe it is either the kickdown cable or just in front of it. I'm going to try to get a better look at it this week.
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  #40  
Old 12-26-2004, 11:59 AM
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Correction to rebuilt trans website address: it is europeantransmissions.com.
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  #41  
Old 08-11-2011, 12:31 AM
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Nice thread!
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  #42  
Old 06-22-2012, 02:30 AM
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I can recommend sun valley mercedes for rebuilt transmissions. They rebuilt my 722.3 and its been running like a dream. Got 3k on her so far.
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  #43  
Old 08-04-2012, 09:58 PM
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Hey everyone,

I just came across this thread in a search for (what I believe to be) my 300D's B2 piston failure.

Yesterday I changed the engine oil and a coil spring. After the oil change I drove the car around the block and all was good. Normal shifting and everything.

Today I went to get some food and bam, only first gear.

Its good to know that getting to the B2 is not as impossible as I thought. Maybe it was the 123 that its rather hard to access...
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  #44  
Old 08-04-2012, 10:05 PM
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Quote:
Originally Posted by JamesDean View Post
Hey everyone,

I just came across this thread in a search for (what I believe to be) my 300D's B2 piston failure.

Yesterday I changed the engine oil and a coil spring. After the oil change I drove the car around the block and all was good. Normal shifting and everything.

Today I went to get some food and bam, only first gear.

Its good to know that getting to the B2 is not as impossible as I thought. Maybe it was the 123 that its rather hard to access...
B2 would be no forward gears at all, like if you were in neutral.
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  #45  
Old 08-04-2012, 10:14 PM
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Quote:
Originally Posted by tbomachines View Post
B2 would be no forward gears at all, like if you were in neutral.
Its kinda like that up until you get to 3-4k rpms. Then it'll start to pull.

VERY similar to what happened with my 300SD a few years ago.
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