722.1xx help in W116 needed - Page 6 - PeachParts Mercedes-Benz Forum

dunl · #76 08-20-2007, 01:28 PM

So all hope is not lost then - thanks guys.

Okay, seem to have somehow come down with strep throat here the week before I go back teaching, so hopefully I can gather enough energy to get to this soon. Maybe I'll try the govenor first, and then the valve body.

I'm assuming the govenor will require the fluid removed like the valve body replacement will?

Also....is it possible to just clean the valve body, or should I just replace it?

pmckechnie · #77 08-20-2007, 05:42 PM

It is not necessary to remove the fluid to remove the governor. You will lose a little, but not much. I would use a small pan to catch what does come out and any parts you may drop.

dunl · #78 08-21-2007, 10:27 AM

How exactly is this govenor removed? I don't want to damage anything.

rrgrassi · #79 08-22-2007, 02:30 PM

I'm not so sure this tranny even has a governor. There are 11 years between the '80 and the '91. Some one here posted a PDF file if a complete 722.1x breakdown and rebuild. I think it had an exploded view w/part numbers and names.

dunl · #80 08-22-2007, 03:57 PM

If anyone has a link to that file, that would be great. I can't find it.

I'm running out of time here, and the car is running out of time even more.

dunl · #81 08-22-2007, 04:40 PM

Okay, it looks like I have a govenor...I'm assuming this is it?

Edited below.

dunl · #82 08-22-2007, 05:55 PM

Correction here: the pan should be drained before doing this, as it is currently doing that right now through the (assumed) governor bolt.

Hope I'm not screwing anything up by assuming this thing is the governor and taking it off.

dunl · #83 08-22-2007, 06:07 PM

10 minutes later, still trickling out in a steady stream.

dunl · #84 08-22-2007, 07:33 PM

Okay, that obviously wasn'tthe governor. Just took the pan off, and it's draining now.

How do I know the vavle body from the 79 will fit the 80? Are they the same transmission vavle body, or different?

dunl · #85 08-22-2007, 10:34 PM

Okay, two valve bodys have been removed. I was expecting the lower part, not the whole thing.

On the 80 300SD, there were two "tubes" sticking straight up from the valve body. The plastic part in the middle is melted in half (i.e. the "clip" was in the form of a drip below the crossbrace on the plastic part)

The replacement valve body came off fine, but without the two "tubes". I noticed there was a rubber fitting on the end instead of being screwed in or anything, so I went back and pulled the "tubes" with their plastic connector out. It's in perfect shape, complete with the top clip.

So some more questions now:

- how exactly do these "tubes" and plastic clip go in? Is there a proper way and a wrong way, or long as they fit?

- the valve body - can it be cleaned while it is out? Mineral spirits, flushed with something else, etc?

Thanks.

rs899 · #86 08-23-2007, 08:43 AM

Dunl-

Gee, it has been a few years since I was looking at the bits you are looking at now...memory fails....

Sounds like you have located the source of the problem...

Here is a view of it.

http://www.jie.com/Mercedes/4_bolt_pan.htm

I think those tubes supply fluid to some portion of the valve body, right? So you had better get them hooked up properly- but how, I'm not sure. You can use brake cleaner on the outside of the valve body. I would be very reluctant to disassemble one.

You might try calling Jaggi (the website I sent the drawing from). I called him once or twice and he was helpful.

Rick

dunl · #87 08-23-2007, 01:00 PM

Thanks for the diagram....I now see what I saw yesterday.

Yes, the tubes look like supply lines for the valve body. They look identical, just hollow tubes with a rubber type seal on the bottom. The clip that holds the two of them together is what bothers me. I suppose if I crawl under and look up I will see which way it goes.

There must be SOMEONE on here who has taken their valve body off their transmission - I can't be the first, right?

rs899 · #88 08-23-2007, 07:30 PM

dunl-

Looks like you and me are on hallowed ground. There are only 3 guys brave (?)enough to rip into the guts of a 722.1xx tranny and the other one just isnt listening tonight.

I looked in the ATSG 722.1xx manual and it was its usual useless self. I think there should be rubber seals on both ends of the tubes, but I am not sure.

Common sense to me is just to be sure they both seal well on both ends and there isn't any interference with anything as you bolt up the valve body.

Another idea is to float your question over on the Vintage forum. There are some wise hands over there and the 722.1xx tranny is pretty normal fare in the Vintage area. I don't recall if anyone opened one up on there, but there are certainly some guys who should know their way around one (eg Tomguy, Chuck Taylor, 240dog and a few others).

Rick

dunl · #89 08-23-2007, 07:59 PM

Hallowed ground -

Well, the clip I found out just slides up and in, keeping the rubber end tight above the valve body and ensuring a good seal. However, the clip on mine melted, and part of it is still wedged in there, requiring me to remove it first. Otherwise, the replacement clip will not go in there, the rubber fittings will not seal, and fluid will not flow easily through the valve body.

As for brave, I think we shall open up the old valve body tonight to see what we shall see.

Depending on how long it takes to get the old melted plastic out (should be pretty easy, as I hope things shrunk once cooled), I might actually get either the girl moving or diagnosed as a terminal organ this evening.

rs899 · #90 08-23-2007, 08:41 PM

Dunl-

You are a brave lad. Open that valve body over a box. If you want, I'll send you some pix from the ATSG manual tomorrow, in the interest of science.

Rick