722.3 Rebuild -- List of Parts Needed

[gerryvz]

Does anyone have a comprehensive list of the parts required to successfully rebuild a 722.3 transmission?

I'm not just talking about an external seal, but also all of the friction discs, bands, and other items that would be needed to properly rebuild a 722.3 from the inside out.

Thanks
Gerry

 

[Duh_Vinci]

I too would be interested to see the full list. When I was gathering the information for my 722.364 rebuild, I was surprised to how many variations of 722.3 exist!

I came across a factory kit 1262705300 (this one for seals and gaskets only), and appeared it spread across huge platform of 722.3XX units

Gasket Set, Trans 126-270-53-00 | MB OEM Parts

126-270-53-00 - Gasket Set, Trans

www.mboemparts.com

The most difficult part for me was to look through a pages of available parts for available steels, as these, along with the clutches comprise a "stack" of many many possible combinations to meet the required specs/tolerances for each assembly. I'll be happy to look through the notes this weekend...

Regards,
D

 

[500AMM]

Does anyone have a comprehensive list of the parts required to successfully rebuild a 722.3 transmission?

I'm not just talking about an external seal, but also all of the friction discs, bands, and other items that would be needed to properly rebuild a 722.3 from the inside out.

Thanks
Gerry

Gerry,

The member that comes to my mind about transmissions is Russel (@whipplem104);
https://www.500eboard.co/forums/members/whipplem104.351/#recent-content
I was in contact with him some years ago about 722.6 conversions and to my understanding he rebuild transmissions himself, maybe he has complete parts lists.

 

[Jimbo]

I'd sure like to find out the reverse related parts for a rebuild, mine has the dreadful 2 second delay now. Not sure how I wore out reverse.

Elbow deep in the GVZ 5-10K right now....we just freshened up the upper motor with new valve covers and gaskets, chain rails, cam seals, front cover etc. etc.

I have that tranny seal kit and I guess we can wait until the tranny is off to see what I need to order if I can't find a parts list....I'll be sure to make one from my rebuild and share.

 

[msq]

Does anyone have a comprehensive list of the parts required to successfully rebuild a 722.3 transmission?

I'm not just talking about an external seal, but also all of the friction discs, bands, and other items that would be needed to properly rebuild a 722.3 from the inside out.

Thanks
Gerry

I wonder if Marc at Sun Valley Transmissions would know?

 

[gsxr]

I'd sure like to find out the reverse related parts for a rebuild, mine has the dreadful 2 second delay now. Not sure how I wore out reverse.

It's a common failure. Likely a design flaw. It's also common to remove 4 or 5 of the 20 springs from the reverse piston while it's apart, to help avoid the problem recurring (and, reduce the delay when reverse is engaged).

I have that tranny seal kit and I guess we can wait until the tranny is off to see what I need to order if I can't find a parts list....I'll be sure to make one from my rebuild and share.

If you have the full seal kit, probably all you need would be the reverse clutches. At that point you gotta decide if you want to mess with any other clutches. And while it's out, not a bad idea to proactively replace the O/L switch, Bowden / control pressure cable, and vacuum modulator...

I wonder if Marc at Sun Valley Transmissions would know?

Marc would know, but it's easier to just buy a full rebuild kit that includes all new seals & frictions from a reputable mfr. It only gets tricky if you want better-than-OEM parts used, i.e. for a 6L build, then just pay Blue Ridge to build it for you.

 

[Jimbo]

Thanx Dave.

Stock OE parts are perfect for this car. Car has 163K on it.

We might as well replace the 1st and 2nd parts if they need it (I can return what we don't use). I don't think the 3rd and 4th plates need any attention tho. Copy on sender too, its on the list.

 

[gerryvz]

I think a lot of it is going to depend on what needs to be done, and the scope of the job overall.

Meaning, is it just an external re-seal job (relatively easy and short parts list), or a more extensive rebuild required (i.e. fixing a bad reverse gear, or a pump removal/reseal, etc.).

 

[gerryvz]

I'd sure like to find out the reverse related parts for a rebuild, mine has the dreadful 2 second delay now. Not sure how I wore out reverse.

Elbow deep in the GVZ 5-10K right now....we just freshened up the upper motor with new valve covers and gaskets, chain rails, cam seals, front cover etc. etc.

I have that tranny seal kit and I guess we can wait until the tranny is off to see what I need to order if I can't find a parts list....I'll be sure to make one from my rebuild and share.

The reverse delay can be nursed for quite a while, if needed. My car currently has 144K on it, and I first noticed the reverse delay around the time I moved to Texas in late 2008/early 2009, when the car had ~100K miles on it. I've been nursing mine for pretty much 10 years. I have about a 1-1.5 second delay. I try to minimize how much I use reverse, as much as possible.

For example, I park my car so that it can be driven forward out of a parking space (if applicable), and back my car into my garage after driving it so that when I start it up cold the next time, I just have to pull forward. I also try to engage reverse only when the car/transmission is warm (fluid has circulated and is up to temp) rather than cold reverse engagement.

So, you can live with it for a long time. I've been tempted a couple of times to proactively remove and rebuild the transmission, but have always prioritized other jobs since it seems to keep soldiering on. Of course, when it does fail I'll have to take care of it right away.

If your transmission has any external leaks, then it is a good time to rebuild it at the same time you re-seal the outside. When I did my Engine Bay Refresh job last year, I did replace my transmission overload protection switch, as I had a modest ATF leak coming from that opening. That solved the leak that happened every time I drove the car (I'd say I would have 8-10 drops of ATF on the floor every time after driving the car).

I still have a very very small external leak (it doesn't drip every time I drive the car, but I have noticed TWO times since last September a drop or two of ATF on my garage floor) that I don't know where it is coming from, but it is certainly an external seal that needs to be replaced. But at this point it is not at the level that is alarming or that I feel I need to pull the transmission to fix. But, I do monitor it closely.

Cheers,
Gerry

 

[Streetr]

The K3 clutches often flake off their friction material (contributing to reverse engagement delay), clog up the main fluid filter and ultimately the two small valve body screens. Changing the main filter and cleaning the valve body screens may provide temporary relief to the delayed reverse, but ultimately the transmission will need to be torn down and gone through.

I change all othe seals, o-rings, bushings and friction liners (brake band, friction discs) along with the split seals in the valve body on the pistons (I only use the Merc [Teflon] seals in this application: 126 270 06 35). If there are any blue spots on the metal plates I’ll change those also since they will tend to be “grabby” on the friction liners. I use glass baking dishes to soak the new friction liners in transmission fluid. Generally I figure anything that won’t last at least another 100,000 miles should be replaced.

One area I spend detailed time on is setting the clutch pack clearances very carefully. I also send the torque converter out for rebuild, flush the trans cooler in the radiator and replace the flexible trans cooler hoses. When I reinstall the transmission in the car I change the shift bushings. There are various other things I inspect and replace as necessary, but this is an overview.

There are a bunch of transmission shops that do not go through the valve body. It’s time consuming, but it’s the right way to do the transmission overhaul. I have very good service manuals and lots of photos.

I will be going through a 500E valve body soon so I’ll take some photos and post them If there is interest.

 

[Duh_Vinci]

I will be going through a 500E valve body soon so I’ll take some photos and post them If there is interest.

Absolutely!!! It’s quite a maze! Additionally, lots of literature “quotes” a different number of plastic balls but not specific to one particular vb …. Look forward to seeing your t tear-down!

Regards,
D

 

[yao500e]

Does anyone have a comprehensive list of the parts required to successfully rebuild a 722.3 transmission?

I'm not just talking about an external seal, but also all of the friction discs, bands, and other items that would be needed to properly rebuild a 722.3 from the inside out.

Thanks
Gerry

we're you able to source a rebuild kit specific to the e500e ?

If so, is there anything special or different about the parts for a later model 722.3 mated to a powerful V8 motor?

thanks.

here is a e500e kit on Walmart online

https://www.walmart.com/ip/OE-Repla...verhaul-Kit-for-Mercedes-Benz-500E/2031170992

 

[gsxr]

Note the kit above from Mal-Wart does not include the brake bands, which are about $400 for both from discount dealers.

 

[yao500e]

Note the kit above from Mal-Wart does not include the brake bands, which are about $400 for both from discount dealers.

it seems none of the 722.3 rebuild kits include bands. even this Oregon performance kit bands are extra add on cost.

I still can not find out the differences or rebuild kit parts since there are so many different models of 722.3 transmissions. are these rebuild kits basically universal parts for all 722.3?

Mercedes-Benz 722.3 Rebuild Kit W4A-040 Master Overhaul Automatic Transmission Banner Box Set W4A040

Check out the deal on Mercedes-Benz 722.3 Rebuild Kit W4A-040 Master Overhaul Automatic Transmission Banner Box Set W4A040 at Oregon Performance Transmission

www.oregonperformancetransmission.com

 

[gerryvz]

The reverse delay can be nursed for quite a while, if needed. My car currently has 144K on it, and I first noticed the reverse delay around the time I moved to Texas in late 2008/early 2009, when the car had ~100K miles on it. I've been nursing mine for pretty much 10 years. I have about a 1-1.5 second delay. I try to minimize how much I use reverse, as much as possible.

For example, I park my car so that it can be driven forward out of a parking space (if applicable), and back my car into my garage after driving it so that when I start it up cold the next time, I just have to pull forward. I also try to engage reverse only when the car/transmission is warm (fluid has circulated and is up to temp) rather than cold reverse engagement.

So, you can live with it for a long time. I've been tempted a couple of times to proactively remove and rebuild the transmission, but have always prioritized other jobs since it seems to keep soldiering on. Of course, when it does fail I'll have to take care of it right away.

I'm almost at 149,000 miles on my car and my transmission situation is unchanged in terms of the reverse delay - still 1-1.5 seconds. I think it's been at least 12-13 years since I first noticed the delay and I've lived with it, taking care as much as possible, for quite a while.