My W123 has been down for a few months now, transmission will not fully engage in forward gear unless given a push. But that is not what this is about.

Now that I have time to actually do some investigating, i've been trying to make sure I am using the correct trouble shooting procedures. So I've been looking into how to identify my transmission. Diesel Giant has a description and pictures. Problem #1, the original numbers for my trans have been ground off by the MFGR. Instead of having the numbers punched into the casing, there is a plate on the front. Reads:

ORIGINAL MERCEDES
Tauschaggregat (Exchange Unit)
(Part number) 123 270 3701
serial number ....

What transmission do I have?

__________________
MC Professor

1981 300D non-Turbo
with unknown 617. motor and 711.311 transmission

What year is your car ?
Can you post pictures of the ' rear end ' of it ?
Is it aluminum or iron ?

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1980 240d ,

chain elongation, cam marks reference:
http://www.peachparts.com/shopforum/diesel-discussion/10414-help-i-need-check-stretch.html

http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html

evap fin cleaning:

http://www.peachparts.com/shopforum/diesel-discussion/156207-photo-step-step-post-showing-w123-evaporator-removal-1983-240d-1982-300td.html?highlight=evaporator

A/C thread

http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html

It's an '81 300D. Diff looks to be aluminum.

Attached Thumbnails

 

__________________
MC Professor

1981 300D non-Turbo
with unknown 617. motor and 711.311 transmission

Also, the engine numbers are missing. The 617 are stamped clearly, but the rest of the stamping are is bare. I wire brushed it, and it does not look as if there were ever other numbers there.

__________________
MC Professor

1981 300D non-Turbo
with unknown 617. motor and 711.311 transmission

Your car belonged to Bond, James Bond.

__________________
1980 240d ,

chain elongation, cam marks reference:
http://www.peachparts.com/shopforum/showthread.php?threadid=10414

http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html

evap fin cleaning:

http://www.peachparts.com/shopforum/diesel-discussion/156207-photo-step-step-post-showing-w123-evaporator-removal-1983-240d-1982-300td.html?highlight=evaporator

A/C thread

http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html

This is an absolute guess that's based on experience in dealerships of US cars. The funny numbers might be telling you that the engine and maybe the trans are factory replacements under warranty. It's not unusal for US makers to have the dealer install a warranty engine with odd number stampings with the idea of keeping the replacement engine generic - maybe it'll go in a car, maybe in a boat, maybe behind a manual or an automatic trans.

Like I said, just a guess as I have zero knowledge of Mercedes' protocol.

Dan

722.311

Thanks.
?.311? What is it out of?

__________________
MC Professor

1981 300D non-Turbo
with unknown 617. motor and 711.311 transmission

never mind, found it. 84-85 500 SEC, big difference.

__________________
MC Professor

1981 300D non-Turbo
with unknown 617. motor and 711.311 transmission

Are the 722.303 and .31 are close enough to interchange? What are the issues and complication which replacing one with the other bring?

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84 300SD
85 380SE
83 528e
95 318ic