190e B2 thrust pins fell into the oil pan - Mercedes-Benz Forum

 
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post #1 of 10 (permalink) Old 02-26-2011, 10:56 AM Thread Starter
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Vehicle: 1992 Mercedes-Benz 190E 2.6L 4-speed
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190e B2 thrust pins fell into the oil pan

Hi everyone!

a few days ago, I was on my way to class and the transmision in my 190e lost all forward gears.

reverse works, so I thought that it might be the b2 piston based on what some others were saying on this forum. Well, I took the pan off and found that the trany fluid was clean. I then took of the filter and a short pin, what I now believe to be a thrust pin, fell out. I took the B2 piston out and realized that it was not that trust pin.

after digging around online I found a schematic of the transmission and found what looks like a second thrust pin on the opposite side of the brake from the piston.

my question is: what is the probable cause for this pin to have fallen out, and how do I fix it. here is a picture of the two pins. the shorter one is the one that I found on the filter.

190e B2 thrust pins fell into the oil pan-photo.jpg

I do not want to have to remove the transmission from the car if i don't have to.

Any help would be appreciated.
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post #2 of 10 (permalink) Old 02-26-2011, 01:58 PM
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I'll say right now that I have no experience with this gearbox, but....

if you found those parts in the bottom of the pan, surely the most likely place they dropped from is the shift valve body, located immediately above.

The shift valve body, and the damper housing come off together.
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post #3 of 10 (permalink) Old 02-26-2011, 03:43 PM Thread Starter
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The title is a little misleading i guess. the pin actually fell off of the top of the filter when i took it off, as if it had been caught there before it could fall into the pan.

I'm a little concerned about taking the valve body and damper off. I'm no trany tech, and this is going a little outside of what I've ever done before, so any advice on what to expect would be awesome. also, is it ok to do that with the trany still in the car?

Last edited by walleye0406; 02-26-2011 at 03:45 PM.
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post #4 of 10 (permalink) Old 02-26-2011, 06:25 PM
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Take a look here:
http://www.benzworld.org/forums/w201...3-722-4-a.html

I think it has a few links to different transmission threads that could help too.
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post #5 of 10 (permalink) Old 02-27-2011, 02:16 PM Thread Starter
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I got the pin in where it goes using hemostats, duct tape, two screwdrivers, a blunt punch, a mallet and four hands. working upside down. ill put some pictures up of the pin in location. there is some damage from where it came out in the first place, but im not sure that it is bad enough to fool with. question is how did it come out in the first place? the b-2 piston looks fine, though i'm going to go ahead and replace it along with the k1 springs, and maybe a modulator.
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post #6 of 10 (permalink) Old 02-27-2011, 02:52 PM Thread Starter
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these are the pics of my model/serial no. And the reinstalled thrust pin. (the smaller one of the pins i showed above.

I'd like to buy a new b2 piston. does anyone know which one i need?
there is 130K miles on the car. the original thrust pin is 42mm in total length which is contrary to what i have seen elsewhere(47mm). also what seals are included in the kit?

Im also going to need the K1 spring kit. i believe the part number is 126 270 44 77. is that right.

need a new rubber exhaust hanger.

190e B2 thrust pins fell into the oil pan-photo.jpg

190e B2 thrust pins fell into the oil pan-photo2.jpg
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post #7 of 10 (permalink) Old 02-28-2011, 10:15 AM
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post #8 of 10 (permalink) Old 03-01-2011, 09:42 AM Thread Starter
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Thanks a ton for the information. Hopefully I can get this thing back on the road soon.
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post #9 of 10 (permalink) Old 12-10-2015, 06:43 PM
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Hi there, did you get your problem resolved?
I have a 1990 190e and going through the precise same issue (found the small thrust pin on the top of the filter), just trying to figure my way around all this.

Thx.
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post #10 of 10 (permalink) Old 12-11-2015, 02:52 AM
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