Differential question - PeachParts Mercedes-Benz Forum

ubertino · #1 11-06-2010, 04:18 PM

I'm looking at some used differentials. Can any 300D from 1980-1985 be used on my car, or are there specific models that I'll want to avoid?

I just had the center support bearing replaced, and now I have a hum that only comes between 60-65 mph, then goes away. It's new.

There is another rotating vibration that is very low, I can feel it in the seat, that just gets faster with vehicle speed. It was present before the carrier bearing (which I hoped would fix it) but has gotten worse.

My CV boots are cracked, but don't appear to be leaking. They're on the list of things to fix soon.

Replacing the pinion bearing and seal, is this something that I can do on my own with jack stands in my garage or something that I'm better off paying a pro to do? I've done the engine mounts, valve adjustments, etc., so I'm not stranger to a wrench. But there are times when it really helps to have air tools and a lift.

Olivier · #2 11-06-2010, 04:24 PM

Pinions bearings on the E300TurboD is a proffesional job. Its not something you can do at home I was told.
The side seals are easy enough tho
Olivier

Stretch · #3 11-06-2010, 04:37 PM

If you're looking at differentials for a W123 300D then you need to get the correct ratio - the OM617a (turbo) engine has a different diff than the OM617 (non turbo)

See http://www.peachparts.com/shopforum/showthread.php?t=263096

For identification info

If you want to do the side seals on the diff - that is a DIY job. The pinion seal however is more complicated as you need to measure the torque of the input drive before and after... the problem is that the torque is a low value so you need an uncommon type of torque wrench.

I've removed the whole rear end on my W123. I'm a one man band - I don't have lifts / pits - and didn't use air tools for dismantling.

http://www.peachparts.com/shopforum/showthread.php?t=276507