I just recently purchased a 1984 turbo diesel 300D. It is the first Mercedes that I have ever owned and it is pretty awesome. After driving it around quite a bit this weekend I noticed that there is a medium pitched hum coming from the rear of the car. I took a look at the rear differential and noticed that there was a drip of oil hanging from the point at which the drive shaft connects to the rear differential. I thought maybe it was a bad seal or a worn bearing of some kind. Could anyone give me some tips on what this problem might be.

I am also looking for a online catalog of all of Mercedes parts. A friend of mine told me that there was a web site somewhere that had a list of all of the parts for my car. He said it was called the Mercedes Star catalog. If anyone could point me in the direction of this online catalog, It would be much appreciated. thanks!

clean the diff, drain oil, find the leaking seal or gasket and fill it with new oil

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1981 300SD 512k OM603

I totally agree. However, if you can't get to the repair soon, then at least consider topping off the lube in the diff until you can -- it's quick and, with the right tools, fairly easy. Mine also leaks around the pinion seal, and I just topped it off last weekend as part of a diagnostic for a problem I'm chasing.

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'83 300DTurbo http://badges.fuelly.com/images/smallsig-us/318559.png

Broadband: more lies faster.

Yep, Dan now has the 84 in my signature. Enjoy Dan!


Does someone here have the link to the EPC (electronic parts catalog) list from MBUSA?

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-E300d '99 350k
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Tom's Imports of Columbia MO Ruined the IP in changing leaky delivery valve O-Rings - Refused to stand behind his work. Mid-MO MB drivers-AVOID Tom's.

Our gracious sponsor will have most any part you might need for your car: searchable by system category. Most part links even have a photo of the individual part. Exploded diagrams are online elsewhere. Someone with that knowledge will hopefully point you in the right direction.

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Best Regards,
Sam

'76 280 Time Capsule
'00 S430 Long Trips
'91 190E Seeing how far it will go. 366k
'04 American Eagle Motorcoach

Ok I found it for you Dan:

EPC (electronic parts catalog)
http://epc.startekinfo.com/epc/

You have to log in and subscribe. I believe it is free.

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-E300d '99 350k
-Suburban '93 220k
-TDI Jetta '03 350k
Sold
-F250 '96 7.3
-Dodge Ram 12V
-E320 '95 200k
-E320 Wagon 1994 155k
-300d Turbo '87 187k miles
-E320 1994 200k
-300d Turbo '84 245k (sold to Dan62)
-300d Turbo '84 180k
-300sd '80 300k
-7.3 Powerstroke Diesel 15P Van 500k+ miles
-190d '89 Non Turbo 2.5 5cyl 240k (my first MB)
Tom's Imports of Columbia MO Ruined the IP in changing leaky delivery valve O-Rings - Refused to stand behind his work. Mid-MO MB drivers-AVOID Tom's.

you need a 14mm allen socket to check the level- autozone carries a set of 4 big sockets for like $10. if the output seals leak, they are not too hard to do, but you need to pull the axles. input seal requires a special socket. and the back cover is easy enough to remove and reseal.


I think almost all 123's have a hum from the rear diff. just keep it full, mine hasnt gotten worse (louder) in 50+K miles running mobil 1 gear oil (fleet farm is cheepest, by like $7 a qt) you need just over 1 Qt to do a change.

this thread reminds me it is time for a change in my car- I know what I'll be doing today......

FYI-StarTek info EPC doesn't work on Macs.

If you dont want to buy the socket, bring over some gear oil and we can change it here (I am in 55406)

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1984 123.193 372,xxx miles, room for Seven.

1999 Dodge Durango Cummins 4BTAA 47RE 5k lb 4x4 getting 25+mpgs, room for Seven.