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  #1  
Old 08-28-2008, 07:00 PM
pawoSD's Avatar
Dieselsüchtiger
 
Join Date: Oct 2004
Location: Grand Rapids, MI
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Exclamation Metal flakes and particles in rear diff oil when drained today!

We were doing an inspection/general maintenance on my dad's 300SD today and when I opened up the diff to check the level some oil drooled out but it had metal flakes and particles in it. (Yes the oil was plenty full) Like, a lot of them. The diff has a lot of slop/play in it, and so on.....its up for replacement. Think it will blow? We put in a fresh fill of M1 75w90 synthetic gear oil (what was in there previously)....that should help. The rear end of his car needs a complete renovation, we're thinking new axles and a 2.47 diff (a good used one).....then it should be set. Kinda scary to see metal particles coming out though! This was after about 30k or so of driving since it was last changed.

Anyone have a proper 2.47 diff that would work in a 1983 300SD for sale? He will likely be in the market for one very shortly.....(as soon as we get the project SD on the road his car gets some work done).....

At least my car's diff is good to go, no metal particles in it and no play in the gears.....so far anyways.
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'89 420SEL 166k - mine (OC-167,000)
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  #2  
Old 08-28-2008, 07:20 PM
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Did it look like the meatl came from the Gear Teeth (did you look at the Gear Teeth) or pieces of Bearing?
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  #3  
Old 08-28-2008, 07:22 PM
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Quote:
Originally Posted by Diesel911 View Post
Did it look like the meatl came from the Gear Teeth (did you look at the Gear Teeth) or pieces of Bearing?
I didn't have much time so I didn't look inside, but I am assuming the metal is from the gear teeth....as the diff has a lot of slop in it (but it still operates smoothly) You can turn the input shaft nearly 1/2 rotation before the drive shafts move in either direction.
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-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 75k - mine - (OC-77,000)
'17 Metris(VITO!) - 6k - wifes (OC-10k)
'01 E320 Wagon - 157k - mine (OC-160,000)
'89 420SEL 166k - mine (OC-167,000)
'01 E320 - 167k - dad's (OC-171,500)
'07 E350 Wagon - 129k - dad's (OC-132,500)
'01 SL500 - 48k - dad's (OC-52,000)
'09 E350 4matic Sedan - 122k - Brothers (OC-127,000)
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  #4  
Old 08-28-2008, 11:29 PM
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Location: Milford, CT
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Nothing lasts forever. I always figure that one day this will happen to me. Luckly used ones are cheap, and rebuilds are actualy not crazy expensive. I'm pretty sure I have seen them for $400.

300k miles out of any part is an impressive service life!
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  #5  
Old 08-29-2008, 01:30 AM
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Quote:
Originally Posted by Hatterasguy View Post
Nothing lasts forever. I always figure that one day this will happen to me. Luckly used ones are cheap, and rebuilds are actualy not crazy expensive. I'm pretty sure I have seen them for $400.

300k miles out of any part is an impressive service life!
Yeah he's fine with it, we just need to look into re-doing his drive line before something bad happens.

I'm thinking we'll replace:

-differential with lower miles preferably a 2.47
-new CV axles
-new flex discs
-possibly new bearing/bearing carrier support

My car has 274k on it almost and the driveline is super tight, my diff is excellent, though it was probably serviced better than his over the years. When we got his car the oil that we drained from the diff looked like crude oil! Probably was the original stuff!

Should be a fun job completely redoing the drive line.

Gotta finish the entirety of the project car first though, thats a BIG list of need-to-do's, we're going at it next week, hoping to finish in 2-3 days or less of constant work.
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-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 75k - mine - (OC-77,000)
'17 Metris(VITO!) - 6k - wifes (OC-10k)
'01 E320 Wagon - 157k - mine (OC-160,000)
'89 420SEL 166k - mine (OC-167,000)
'01 E320 - 167k - dad's (OC-171,500)
'07 E350 Wagon - 129k - dad's (OC-132,500)
'01 SL500 - 48k - dad's (OC-52,000)
'09 E350 4matic Sedan - 122k - Brothers (OC-127,000)
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  #6  
Old 08-29-2008, 11:21 AM
Registered Diesel Burner
 
Join Date: Aug 2001
Location: Northern Virginia
Posts: 2,911
Does the car shift hard?

If so, that can be the source of differential wear. I dredged up one of my old posts where I went through the same thing you seem to be going through now.

Excessive W123 Differential Wear - Pictures

You need to get that back cover off and do an inspection. And if the car shifts hard, take care of that also. In addition to doing an inspection, taking off the back cover will let you clean out the other accumulated metal shavings.

In my case, I cleaned everything out, filled back with Mobile 1 synthetic gear oil, and continued to drive for at least a year. It was certainly taking a risk, because at any point that differential could have come apart further and jammed - causing any number of a range of consequences up to and including loss of life.

Now I have a replacement differential in the car that is tight, have the transmission shifting gently, and expect the setup to outlast the rest of the car.

Hope this helps.

Ken 300D
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  #7  
Old 08-29-2008, 12:07 PM
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I just swapped my original oil (at 80K) and it was caramel colored, as if it had a tiny amount of water in it.
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  #8  
Old 08-29-2008, 12:26 PM
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2.47 is low for a 617, its going to be a dog off the line. Whats in the car now a 3.07?
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  #9  
Old 08-29-2008, 12:37 PM
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Here is a similar failure
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  #10  
Old 08-29-2008, 03:15 PM
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Location: Grand Rapids, MI
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Quote:
Originally Posted by Hatterasguy View Post
2.47 is low for a 617, its going to be a dog off the line. Whats in the car now a 3.07?
Yes, he's not an aggressive driver, so he'd prefer the quietness on the highway. It does not shift hard, it actually shifts pretty soft, my car shifts much harder than his and my diff is fine....figures.
__________________
-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 75k - mine - (OC-77,000)
'17 Metris(VITO!) - 6k - wifes (OC-10k)
'01 E320 Wagon - 157k - mine (OC-160,000)
'89 420SEL 166k - mine (OC-167,000)
'01 E320 - 167k - dad's (OC-171,500)
'07 E350 Wagon - 129k - dad's (OC-132,500)
'01 SL500 - 48k - dad's (OC-52,000)
'09 E350 4matic Sedan - 122k - Brothers (OC-127,000)
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