722.303 in bits photo shoot - Page 5 - PeachParts Mercedes-Benz Forum

Stretch · #61 09-02-2012, 12:33 PM

The B2 piston is a bit knackered but at a push I reckon "it would do a trip".

Other than the crud that is shown above on the large PTFE sealing ring on the outer edge of the piston (which needs to be replaced) there are some nasty wear marks on the shaft of the piston denoted by the arrows in the picture above. It would probably be best to replace the whole assembly...

The bores in the transmission casing are pretty damn good though - they have escaped with only a light polishing.

To save what I've got I've cleaned and greased up the bore so that corrosion doesn't take hold whilst I decide what to do with it all.

This picture shows loads more grease than is needed - but that's what happens when you are setting the stage for a peach parts photo shoot!

Stretch · #62 09-03-2012, 02:12 PM

I'm a bit disappointed!

I wanted to be able to really take the governor to pieces but it looks like it is more or less treated as a sealed unit despite advice in the ATSG manual that says you need to clean it. I guess you can't clean it in its component parts that easily. You'd have to do your best by pushing the plunger (which attached to the weights) in different positions and then washing it through with a solvent and lots of clean transmission fluid.

Anyway here are the pictures of it in parts - well taken down to parts without damaging anything!

Stretch · #63 09-06-2012, 07:48 AM

At the risk of being even more irritating than normal - I really can't get over how easy it is to take a 722.3 to bits!

OK I'll shut up and just post the pictures =>

Take out the little spring clips (don't get them mixed up)

And now looking the other way

Stretch · #64 09-06-2012, 07:55 AM

To get the output shaft out of the gearset remove the circlip ring on the output shaft

Pull output shaft through gear set.

And there's the bit with the K2 clutch in it

To get to the reverse brake (I'm not sure it is called that - I'll check wait 1!) remove another spring clip

Stretch · #65 09-06-2012, 08:00 AM

Remove another of those spring clips to get at the clutch pack

The paper based friction material is a bit worn in the middle of the pack but the steel stator plates are in good condition - happy happy!

Just so you get an idea of how easy it is (yes I know it is irritating to read this sort of thing) the gear set was taken to pieces within 30 minutes including the arsing about with the digital camera for you lot and drinking a cup of coffee...

...so OK the piston for the K2 clutch isn't in bits yet - I'll save that treat for another day - but on the whole I think this is a nice little earner for any transmission shop.

Stretch · #66 09-06-2012, 08:51 AM

The ID numbers are for the parts shown in this PDF

http://www.ganzeboom.net/images1/ganzeboom/parts/Mercedes/722.3,%20722.4.pdf

I've added in a USD conversion at 1.26 USD = 1 Euro

rs899 · #67 09-06-2012, 10:44 AM

Yes, it comes apart without too much of a struggle.

A hundred or two in parts ( less at trade costs) an hour or two of easy benchwork (if you know what to do) and the client gives you $1.5K- $2K. Then R&R labor.

Once the smoke and mirrors are removed, it's not all that difficult.

Stretch · #68 09-06-2012, 10:53 AM

Quote:

Originally Posted by rs899

Yes, it comes apart without too much of a struggle.

A hundred or two in parts ( less at trade costs) an hour or two of easy benchwork (if you know what to do) and the client gives you $1.5K- $2K. Then R&R labor.

Once the smoke and mirrors are removed, it's not all that difficult.

Well $1.5K - $2K here would be a bargain. I'd expect to have to pay at least 3000 euro here...

SuperCow · #69 09-06-2012, 11:02 AM

Nice report.
I would try to rebuild it myself if my 722.414 would fail.
Maybe i can ship it to you, and also make a nice how-to about the 722.4

But at the moment it shifts silky smooth, so i have to disappoint you

Zulfiqar · #70 09-06-2012, 12:41 PM

Im on the hunt for a dud trans 722.4 that I want to take apart and rebuild after seeing this (probably ask someone to take pictures, as I have gorilla hands and arsing with the camera and working on the trans can cause loss of camera - hmm I'll look for a cheapie camera), I have many times seen a toyota RWD trans being built and its very similar except there is no modulator in it.

anyway army - how many cups of tea do you think are required when putting back

- speaking of cleaning this governor, The toyota trans i speak of being seen rebuilt, the mechanic would take some carb cleaner and dunk it in, then use a can spray carb/brake cleaner to flush it out, there is nothing but a shaft that exposes some oilways, And as its spinning it can act like a centrifugal oil filter which locks in some dirt sometimes. Once he was finished with the spraying he would drop it in the same bucket the new clutches were taking a bath in which was filled with ATF.

Stretch · #71 09-06-2012, 01:22 PM

Quote:

Originally Posted by Zulfiqar

Im on the hunt for a dud trans 722.4 that I want to take apart and rebuild after seeing this (probably ask someone to take pictures, as I have gorilla hands and arsing with the camera and working on the trans can cause loss of camera - hmm I'll look for a cheapie camera), I have many times seen a toyota RWD trans being built and its very similar except there is no modulator in it.

...

From what I understand the 722.4 is similar but it doesn't have the secondary pump and there are more plastic parts in there. But essentially they are the same.

Quote:

Originally Posted by Zulfiqar

...

anyway army - how many cups of tea do you think are required when putting back

...

My guess - about 8 cups!

Quote:

Originally Posted by Zulfiqar

...

- speaking of cleaning this governor, The toyota trans i speak of being seen rebuilt, the mechanic would take some carb cleaner and dunk it in, then use a can spray carb/brake cleaner to flush it out, there is nothing but a shaft that exposes some oilways, And as its spinning it can act like a centrifugal oil filter which locks in some dirt sometimes. Once he was finished with the spraying he would drop it in the same bucket the new clutches were taking a bath in which was filled with ATF.

Thanks for that information I thought something like that might be the norm.

Stretch · #72 09-06-2012, 01:23 PM

Quote:

Originally Posted by SuperCow

...
But at the moment it shifts silky smooth...

Well keep it that way - that's what I say!

Zulfiqar · #73 09-06-2012, 01:30 PM

I think I need to read that german manual now, I have read somewhere that there is something at the very front of the 722.4xx trans that is fiddled with if it suffers amnesia when reverse is selected.

Stretch · #74 09-07-2012, 08:33 AM

I've updated the costs in post 66 - too much money for this project I think.

The plan was to try and see if I could make some funds for the W123 but I don't think there's enough of a margin in it - well the money I'd spend in parts is a bit too close to what I think I could sell it for...

...I'm not a professional company selling a transmission with a waranty you see. I can't pressure test the valve body and I don't have a dyno to check to see if works before I send it out the door...

So what would you do? Let me know what you guys think.

SuperCow · #75 09-07-2012, 09:15 AM

Well there some parts that have to be replaced that a normal rebuild wouldn't be needed, like the governor and drum. I think its cheaper to buy a other used 722.3?
and rebuild that?