Going to rebuild my 722.315 - PeachParts Mercedes-Benz Forum

300dmichael · #1 07-12-2015, 02:18 AM

Hello everyone..I have been lurking here for the longest time and now it is time to give back!!

I am going to rebuild the transmission in front of everybody..The trans is a 722.315 out of a 83 300D turbo..The car has over 400 thou miles and the trans was working fair but it had it's issues..It Leaked like crazy..just about everywhere..But the main leak was the secondary oil pump..After you parked the car after a run, within 30 minutes there was a puddle about 8-10 wide on the driveway..coming out of the secondary pump..

I have yanked the engine and tranny and have already rebuilt the engine..
Sorry I didn't take pictures of the engine rebuild..but it is done and waiting for the trans to be done..

So with out much further explaining..I will take as many detailed pictures as possible and step by step show every detail of this project..

Everyone ,Please contribute to this as I go along..If I am making a mistake, please tell me!!

So here is the first picture..The trans is on a sawhorse table in my garage..and this is a close up of the secondary pump before I pulled it off..Bolts are loose and ready to remove it...

Edit.. As usual a problem uploading a picture..

300dmichael · #2 07-12-2015, 02:42 AM

I want to show the pictures!!
I use the "Manage Attachment" button..The upload accepts the picture but it won't show on the post..

Now what??

Stretch · #3 07-12-2015, 03:02 AM

You are probably missing an error notice in the pop up window. The picture size can only be a maximum size of 800 X 600 (or 600 X 800).

300dmichael · #4 07-12-2015, 10:02 AM

I resized to 790 x 590..it was 800x 600..Lets see..

That worked!! Thank You!! You are a true gentleman and wise..

300dmichael · #5 07-12-2015, 10:17 AM

Here is the pump exploded view showing #2 O ring..There was no O ring on my Trans,,Nothing or even a remnant..How it didn't leak earlier..no clue..But it sure did at the end!!

Also pictures showing the backside of the pump laying on the table..

And the side of the trans where the pump was..No O ring!!

ROLLGUY · #6 07-12-2015, 10:33 AM

That trans sure is clean! I can only assume you cleaned it before taking on the rebuilding project. I can't wait for the process, as I have always wanted to be able to rebuild one of these...Rich

Carpenterman · #7 07-12-2015, 10:43 AM

Yea, this is gonna be good.

300dmichael · #8 07-12-2015, 10:52 AM

Yes, after taking it out, I masked all the openings with duct tape and hit it with a Harbor freight soda blaster..It cleans it so fast!! With a power washer, it just wouldn't cut it..Soda blasters are perfect for aluminum because it doesn't pit the metal..The soda just absorbs the grease and then just blows off..

But it makes a white powder mess..on the ground and everywhere..But I have a pretty big backyard and have a spot to do it on..

To do this trans..and it was very filthy..about 15 minutes..

So here is the next photos showing the disassemble of the pump..

From what I am seeing, the way the pump works is when the engine is running, oil pressure goes into the cylinder and pushes the piston #10 outward..This disengages the pump drive (this is the piston) and the gears don't spin..

But when the engine is not running, the spring #12 pushes the piston back into engagement with the drive and the gears will spin..

So the pump only spins when there is no oil pressure from the main pump..

Here is an explode view from the manual and a picture of the pump piston and parts..
third picture shows that this area had it's O ring..

Mike

Stretch · #9 07-12-2015, 02:07 PM

Quote:

Originally Posted by 300dmichael

Here is the pump exploded view showing #2 O ring..There was no O ring on my Trans,,Nothing or even a remnant..How it didn't leak earlier..no clue..But it sure did at the end!!

Also pictures showing the backside of the pump laying on the table..

And the side of the trans where the pump was..No O ring!!

I'm glad you got the pictures sorted out. There is also a maximum file size limit so you can get 800X600 for lower jpeg compression - perhaps you have a super duper camera with the latest compression? (I guess v-bulletin software is a bit behind the times these days)

Anyway on with the re-build!

I thought I'd ask =>

Do you realise that this is the secondary pump and that it is very rarely in use?

Do you have the chapter 27 information from WIS or a copy of an ATSG manual for this?

I've also collected a few links for the rebuilding of transmissions if you are interested.

300dmichael · #10 07-12-2015, 03:29 PM

Quote:

Originally Posted by Stretch

Do you realise that this is the secondary pump and that it is very rarely in use?

Do you have the chapter 27 information from WIS or a copy of an ATSG manual for this?

I've also collected a few links for the rebuilding of transmissions if you are interested.

Hi Stretch,
Yes I have both of those service manuals and I am using the WIS 27 ..I printed all of the pages and it is right next to the transmission..

I found the 2 manuals from other forums about mercedes and I think that most of the stuff that I down loaded was from you!!..

I have gathered all sorts of pictures..exploded views..everything that I can dig up..

Here is the front cover page to the manual that I printed out..Something like 153 pages..

When it comes to the progress of all this, I am actually about 2 weeks ahead..
Something like 150 photos of the tear down already..I just need to get them up and detail the fine points of the tear down..

I will be posting a lot of pictures tonight

The camera takes about a 3 meg shot using SR (scene recognition)..Then I bring it into a program called Paint.net..Not MS Paint..Paint.net has a resizer to it..just punch in the numbers and it does it..

oldsinner111 · #11 07-12-2015, 10:29 AM

I've got 355,000 mi. on mine,.Wish they'd built transmission like this again.I won't buy nothing new now,they all fail early.I use syntheic in both my SD trans,and 722.605.I think the fluid not breaking down,and using neutral at stop lights helps alot.Trans coolers are a plus.

BillGrissom · #12 07-16-2015, 03:36 PM

Thanks for the excellent photos and description. The design looks fairly old-school, like something you would see from Russia. The oil sprayer is neat. Two things scare me - the $326 price of the basic rebuild kit. I bought a similar "clutch & steels" rebuild kit for my 64 & 65 Chryslers recently for $55 and my 2002 T&C kit was $108. If you need internal "hard parts", they are easy and cheap for old U.S. cars, but could be a treasure hunt for the M-B. I am especially worried about the many plastic parts you show. Nylon has held up well in automotive apps, but still seems like just time before it turns brittle.

Re tyo604's question, I would say this tranny looks more complicated inside than most U.S. trannys. I understand this one is somewhat similar to a 1960's Ford tranny (vacuum modulator). My old Chrysler trannys (904, 727) are straightforward inside and easy to rebuild, and fairly unchanged thru the 1990's. I rebuilt my 2002 minivan 4-spd tranny and it was even simpler inside (no bands, just more clutch packs). Some complexity moved into the electronic "solenoid pack" and that can be easily swapped from the outside. But, surprisingly it still has the "valve body", which looks as complicated as 1960's trannys. I have no idea about the latest 6+ spd auto trannys and all the variations of "auto-stick" and CVT.

300dmichael · #13 07-16-2015, 04:54 PM

Thanks guys for all the comments..

You are right, this is a transmission that really is straight forward in it's construction..Yes 325 for a master kit, but there was a lot more Ford c6-4 and Chevy 350 trans out there in comparison to this 722.3xx..

I am doing this as a personal challenge, but to also show that the average guy who works on these cars can handle a rebuild like this..

The only special tool that I have used is that silly bar clamp!!

How often you see on this forum of someones tranny taking a dump and the only solution is an expensive rebuild at a tranny shop or getting a hopefully good one at the wrecking yard..

Besides, how many perfectly good 123-116-126 cars are at the wrecking yard because of the expense of a rebuilt trans..

You drop your tranny at a rebuild shop and because it has MB on it..3 times the price!!

I will have probable 700 into this..That price includes a rebuilt torque converter..

How much would a transmission shop charge??

Besides when I pull out on to the street to test drive it and it shifts through the gears, like I had just pulled out of the dealership when it was new..It will put a big smile of satisfaction on my face of a job well done!!

300dmichael · #14 07-17-2015, 01:24 AM

Now here is the beginning of what you all have been waiting for!!

The front pump has 9 bolts and after removing them, nothing happens..So you use 2 of the bolts and looking at the pump in the picture you see a threaded hole at the 9:30 and the 3:30 position..You just take a bolt for each hole and start screwing it in evenly to press the pump out..

I just turned each bolt about a half a turn each, alternating back and forth to bring the pump out evenly..

Then the pump and all of the extras attached to it, like the 6 sided piston comes out like a unit..Nothing is loose or rolling away..I just set it on the table and that finished it..I will dissemble it later..It is now in a box waiting..

You can now reach in and grab the forward band..you just reach in with needle nose pliers and whatever to pop it out of there..

As you can see in the last picture, the band was beyond worn out and the 1st clutch pack has slight groves cut into it..I will show the removal of the 1st clutch pack in the next post..

So far so good..
mike

300dmichael · #15 07-17-2015, 01:50 AM

Now you reach in and pull out the first drum and clutch pack..As you pull it out there is a thrust washer and a stack of shim rings that come out with the drum..

I am sure that these shims are important for some sort of measurement to be done when you are putting it back together..I just took a good picture and put all the shims and thrust bearing in a plastic bag..

The drum clutch pack is a complete unit..nothing loose and you just pull it out..no spring or balls going every every direction..so no fears..I just set it down in the same box as the pump assemble and will work it later..

Mike

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