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Roncallo 01-11-2009 01:37 AM

722.6 K2 Clutch Drum Hell
2 Attachment(s)

I tried to put this in tech help but for some reason I've been unable to post to that forum.

I have a major fire going on here. The M120 powered 560SL is on hold until this can be resolved, which unfortunately looks like it may require lots of money.

I was overhauling the transmission and everything was going fine until I went to install the new $600.00 input shaft and K2 clutch drum. Apparently the original had 78 teeth and the new one has 90 teeth. The part number I ordered is 140 270 12 25 and that is the part number on the box. Since I had to modify the output shaft with a Sonex reducing bushing I'm really up the creek and have to replace this input shaft.

So my question is did I interpret the EPC correctly or did I possibly get a miss boxed part. Since I ordered this 2 months ago I will need to get my story straight to return it.

The way I understood the EPC in this case was that my car came with a 140 270 04 25, which was replaced by a 140 270 16 25 which was replaced by 140 270 12 25 and required additional steels and a piston. I did check the data card and I do have the originally installed transmission 722.621 serial number 0010765.

whipplem104 01-11-2009 12:33 PM

This is how it has always been. The bottom line is that every time that you repl. any parts, you can bet that the whole half of the transmission has to be repl. I believe that you did get the right part, but that it requires that you get more parts. I did a 2005 clk55 that was 3 months old and had 500 miles on it and the transmission had been updated and required all new major components on the input side. This is the reason that I have just gone to buying a used transmission from a salvage yard any time I need anything more than seals and clutches or a sprag.

Roncallo 01-11-2009 01:04 PM

Thanks for the reply Whipplem

Well I seem to live an learn. It does give me a lot more respect for our Configuration Management Team where I work. At this time I'm really screwed because I updated the output shaft using the Sonax reducing bushing. Had I known all this I would have just replaced the front bushing with a new one and buttoned the whole thing up. So in any case my next step is to try to find a 78 tooth input shaft with the needle bearing installation.

It appears that part number 140 270 16 25 was the first changed input shaft to require the smaller diameter output shaft pilot. But is there any way I can find out how many teeth this shaft has and is it still available. Is there a Mercedes parts questions hot line.

I think it may be time to visit my local AMMCO dealer and make deals with this shaft. It does appear that I got the shaft and would rather not have it.

whipplem104 01-11-2009 02:38 PM

The problem is that MB does not reference parts this way. Someone would have to know the part number of the shaft with the different teeth and the compatible part numbers for the other parts. MB just gives updated part #s and notes for other required updates. Also the part numbers on the part may or may not mean anything for looking it up. It just is not worth the time for anyone due to volume to pay any attention to any of this. Really I am not suggesting that you get another transmission because it is easy but because it is also cheaper. Any v8-v12 will work. The only differences is the number of clutches once you have the larger nag1 or wa580. You already have all the different clutch sets from your transmission. Other than that you just swap the front cover so it bolts up. I always get 2000 or newer transmissions unless I needed a m119 bellhousing for some reason. Most of the major improvements were done by then but they updated parts to the very end. We use to have sheets made up when we were rebuilding these all the time for the updates but those sheets had to be updated constantly and once we stopped rebuilding them everyday no kept after it.
Did you price the inner multiple-disc carrier/clutch that has the opposing gears. You just need to check to make sure that the outer fits also if you update. You can see it is pretty easy to spend 1500-2000 for just half the transmission and you still have all the old parts on the back half.

Roncallo 01-12-2009 06:53 PM

Just as Whipplem104 said. I'm really screwed. I just had my local dealer check into this and I would need 2 more hard parts and 5 clutch steels to the tune of about $1000 to make the drum I have work. But the almost funny part is that those parts I need, are no longer available.

So at this point. I need to find a used transmission or an old style, large pilot output shaft and just put it back together with the original clutch.:mad::(

Roncallo 01-12-2009 07:23 PM

Found a cheep sleazy solution

It kills me to have to do this. Especially after doing my first cheep sleazy solution of machining and modifying my output shaft with a Sonex reducing bushing.

So the moral of the story is: A cheep sleazy fix can be undone with another cheap sleazy fix. 8Q2em118Q2el1247

suginami 01-12-2009 09:09 PM

It's amazing what's available on ebay, isn't it?

Roncallo 01-17-2009 10:31 PM

2 Attachment(s)
I'm now out of clutch drum hell and the transmission is installed. The Sonex reducing sleeve coupled with the Chico reducing bushing bailed me out. Of course I cant return the $500.00 worth of parts I have that I couldn't use

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