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  #16  
Old 11-13-2018, 03:46 PM
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math:

The box in the posts from almost 12 years ago is not the same as the one you are having a problem with.
What oil do you currently have in your box? If not ATF, that may be the problem. Before a teardown, try using Type F ATF.

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  #17  
Old 11-13-2018, 07:27 PM
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Quote:
Originally Posted by Frank Reiner View Post
math:

The box in the posts from almost 12 years ago is not the same as the one you are having a problem with.
What oil do you currently have in your box? If not ATF, that may be the problem. Before a teardown, try using Type F ATF.
oh okay, they look the same to me

w123 4 speed manual.

I was using ATF, before putting the box in it's place inside the car, i had it on it's side and filled it with ATF ( maybe too much ? ), not sure what type though, i thought there was only 1 type ?

Here's a link to what i used

https://www.castrol.com/en_au/australia/products/cars/automatic-transmission-fluids/atf-dex-iii.html

The grinding synchro issue is only when trying to shift into 2nd gear. 1st, 3rd and 4th are fine.
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  #18  
Old 11-13-2018, 10:26 PM
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Can over filling with atf cause a bad shift change ?
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  #19  
Old 11-14-2018, 01:21 PM
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Quote:
Originally Posted by math View Post
Can over filling with atf cause a bad shift change ?


Well if uncertain about the fluid level after the transmission was installed. Just pull the fill plug and let it drain down. Or add fluid until it reaches the plug level.

Additional drag just might make it harder to shift cleanly if really overfull. Also I see no advantage to being overfilled in general. Certainly under filled is especially not a good scenario.

As a general expectation weakness in the syncro ring between first and second is probably the most common problem with these particular transmissions. They were a heavy duty transmission for the loading they see in our diesels by original design. Capable of handling far more power than our cars produce. Mercedes also put them behind some pretty powerful gas engines in the day.

Most of the older manual transmissions where fairly easy to deal with. Or at least in my experience they were. The last one I did was a first to second syncro ring in our large truck.

Again a simple job basically. Although you wanted a heavy transmission jack for that one.

Then again I am getting pretty old. Few things remain fairly simple and straightforward today in comparison. To what they were. Has to be viewed as a relative understatement.

Last edited by barry12345; 11-14-2018 at 01:32 PM.
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  #20  
Old 11-15-2018, 07:38 AM
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Thank you.

My transmission came from a 300D, not a 240D if that makes a difference.

Also, 1st thing i'll do is drain the atf in there and then refill it to correct level.

I have a heavy duty Jack to use to bring the box down.

I hope it's a simple gearbox internally that i don't need any special tools.

I'll get some snap ring pliers, i have spanners, screwdrivers, sockets and Allen key stuff.
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  #21  
Old 11-15-2018, 09:18 AM
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Quote:
Originally Posted by math View Post
oh okay, they look the same to me

w123 4 speed manual.

I was using ATF, before putting the box in it's place inside the car, i had it on it's side and filled it with ATF ( maybe too much ? ), not sure what type though, i thought there was only 1 type ?

Here's a link to what i used

https://www.castrol.com/en_au/australia/products/cars/automatic-transmission-fluids/atf-dex-iii.html

The grinding synchro issue is only when trying to shift into 2nd gear. 1st, 3rd and 4th are fine.
You cant use DEX III in a old mb tm they use ATF type A. DEX III is too new I guess.
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  #22  
Old 11-15-2018, 10:01 AM
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I live in Canada so things may be a little different here. Type F transmission fluid is available here from tractor dealers.

I do not remember seeing it on the shelves of chain stores reciently. Then again I am not buying much automatic transmission fluid. So I just might have missed it.

Also it might be more commonly available in American outlets. It kind of makes sense at the sane time as nothing current that comes to mind takes it I can think of.
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  #23  
Old 11-15-2018, 01:10 PM
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I rebuilt the 4 speed out of my 83 240D a couple years ago. This transmission was the aluminum one. The 716.210 I think. The part numbers for the synchros I used were 124-262-00-34 and 123-262-01-34

I'd verify the parts will fit your trans in an online EPC:

https://mercedes.7zap.com/en/eu/fg/car/240/240+d/222/123123/gm/716210/03g/26/0/545/0/0/#68
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  #24  
Old 11-15-2018, 01:36 PM
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Quote:
Originally Posted by Frank Reiner View Post
math:

The box in the posts from almost 12 years ago is not the same as the one you are having a problem with.
Quote:
Originally Posted by math View Post
oh okay, they look the same to me

math:

The box in the thumbnail which you have posted is an iron case box (716.0xx).
The remainder of the posts from all parties address aluminum case boxes (716.2xx).
If the distinction has escaped anyone,...put down your tools, step away from the car.
The parts do not interchange.
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  #25  
Old 11-15-2018, 01:40 PM
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I'm In Australia, so finding some things are near impossible here.

I'll get a picture of the transmissions number off the side today

Did you need any special tools to rebuild the transmission BirthdayBenz ?

P.S thank you for part numbers.
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  #26  
Old 11-15-2018, 01:43 PM
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Quote:
Originally Posted by Frank Reiner View Post
math:

The box in the thumbnail which you have posted is an iron case box (716.0xx).
The remainder of the posts from all parties address aluminum case boxes (716.2xx).
If the distinction has escaped anyone,...put down your tools, step away from the car.
The parts do not interchange.
Cheers.

I'll do the fluid change, get the full number off of the box today and see how we go, if no good i'll order a new synchro off of Mercedes.

sorry, it's about 5am here, late night posts. the boxes looked the same haha


edit: So, i can't get a picture of the number on the transmission :'( no matter which way i angle my phone to take a picture i can't seem to get it, between the slave cylinder and drive tunnel, not much room haha

I do have the VIN for the car though

Last edited by math; 11-16-2018 at 04:03 AM.
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  #27  
Old 09-07-2020, 03:09 PM
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perhaps i missed it, but where did you purchase these syncros? need to do 1 to 2 and thinking about pulling my transmission this winter. thanks!
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  #28  
Old 09-07-2020, 03:51 PM
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See the first photo in post #5 to identify the synchros, then visit this site for the part numbers:

https://mercedes.7zap.com/en/eu/fg/car/240/240+d/222/123123/gm/716210/03g/26/0/545/0/0/#68


4th: A 123 262 01 34
3rd: A 123 262 01 34
2nd: A 124 262 00 34
1st: A 124 262 00 34


Quote:
Originally Posted by sadiesmercy View Post
perhaps i missed it, but where did you purchase these syncros? need to do 1 to 2 and thinking about pulling my transmission this winter. thanks!

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