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  #46  
Old 06-30-2019, 09:54 PM
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Posts: 4,177
I did inspect the ring very closely. There is 3 very faint marks on it. None of which give me any pause about the serviceability of the part. They could be orders of magnitude worse before worrying about them.

I did note a bit of magnetic foreign material on the tip of the speed sensor which is fairly strongly magnetic. I didn't notice it until after pulling the sensor out and fishing it over the top of the diff and out of the way. That leaves the opportunity to have picked up some other foreign debris, but unlikely.


If I had to describe the noise, it would be imagine a diff assembled dry and not filled with lube. Then imagine how it would sound before the bearings heated up and self destructed. Kind of a hiss. Its not real loud, you can't hear it in the cabin with the windows up. The noise doesn't travel through the chassis. Its unrelated to load at all.


I'm thinking to hook up a chassis ear to a pico scope and get a few captures. Being able to visualize the sounds may shed some light on it.

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90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE
104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff
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  #47  
Old 06-30-2019, 10:36 PM
Dubyagee's Avatar
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Location: SE
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Sounds like pinion bearings from the description.
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  #48  
Old 07-01-2019, 07:41 PM
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Posts: 4,177
Quote:
Originally Posted by Dubyagee View Post
Sounds like pinion bearings from the description.
{Fingers in ears} La La La La La!



After pricing pinion bearings today I went ahead and ordered a set in. I really, really, reeeeally didn't want to have to futz with the pinion. It's just a simple carrier swap after all... right? Oh well, what's another couple hundred bucks?
__________________

90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE
104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff
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  #49  
Old 07-01-2019, 08:25 PM
88Black560SL
 
Join Date: Oct 2004
Location: CT
Posts: 3,510
Good luck with this. When you put it back together you can put temperature labels near all the bearings. Here's a picture of two mounter nearest the pinion bearing.

These are available for about $5.00 + $5.00 shipping from McMaster. My car runs about 180°F on a long 7 hr cross country drive in 90°F ambient.
Attached Thumbnails
3.06 ATB Differential-p1000401.jpg  
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To see my 129 parts for sale visit:
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John Roncallo
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  #50  
Old 07-02-2019, 06:34 PM
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Posts: 7,534
Have a look at the vids in this thread.

https://www.peachparts.com/shopforum/mercedes-benz-performance-paddock/395119-differential-cover-testing-gale-banks.html
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  #51  
Old 07-03-2019, 11:44 PM
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Join Date: Oct 2004
Posts: 4,177
Pulled the diff back out and apart. I remember why I hate doing pinion seals. What a bear to pull the yoke off the damned things. After pressing the pinion out it was obvious that the rear bearing was the noisy one. It wasn't likely to fail any time soon but the wear on it was obvious and enough to explain the noise.


The front bearing race is easy enough to knock out but there isn't enough purchase on the rear bearing race to get a punch on it. Ended up welding a couple blobs onto the race to get some meat to hammer against. It came out easy enough. New races went in without any hassle. Rear bearing pressed onto the pinion followed by the tone ring for ABS. Front bearing and spacer went into the case before the pinion seal. Then the whole stack was put in the press to push the yoke on enough to start the nut. Using the impact I snugged it down until a bit of resistance was felt. When I first spun it, about 30% of the revolution felt like it was binding. My heart sank but I quickly realized that the pinion seal needed to sit a bit less than flush to prevent interference with the yoke dust shield. After using a drift to seat it further the pinion spun nice and free. I kept impacting in short bursts and checking the resistance to turning. It quickly went from very loose to just right. I didn't measure it beyond a calibrated feel, but it very closely feels like the previous measurement, actually measured. I double checked the position to my measurements prior to disassembly and it was spot on. LSD carrier went in, and side caps torqued. One thing jumped out to me right away. Upon turning, the diff now coasts a bit where previously it stopped almost immediately. The quaife is 12 lbs heavier than stock and should coast with a bit of momentum... and now it does.

Back in it goes, I'm getting pretty quick at that. After filling with gear oil....again I spun it up on the lift. Success! Drove it home, about 5 miles and it sounds great. Now if it just stays that way I'll call it a win.

Lesson learned.... don't think you can get by only doing half the job. If you're gonna have one apart, you really gotta go all the way.
__________________

90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE
104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff
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  #52  
Old 07-03-2019, 11:59 PM
Dubyagee's Avatar
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I thought the explanation pointed to pinion bearings. At least its done now
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  #53  
Old 07-05-2019, 04:25 PM
88Black560SL
 
Join Date: Oct 2004
Location: CT
Posts: 3,510
Quote:
Originally Posted by duxthe1 View Post
Lesson learned.... don't think you can get by only doing half the job. If you're gonna have one apart, you really gotta go all the way.
Then there is me, I got my diff from a Junk yard and thought, I have no history on this so I better replace all the bearings. and of course when I pulled them out they all looked perfect.

Glad to see you got it going hope it stays quite.
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To see my 129 parts for sale visit:
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John Roncallo
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  #54  
Old 07-21-2019, 12:33 PM
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Join Date: Oct 2004
Posts: 4,177
Happy to report the diff is still working great. I'm calling it good.

As a followup on this thread I'm posting pictures of all the bearing numbers for reference.
Attached Thumbnails
3.06 ATB Differential-side-bearing.jpg   3.06 ATB Differential-side-bearing-race.jpg   3.06 ATB Differential-front-pinion-bearing.jpg   3.06 ATB Differential-rear-pinion-bearing.jpg  
__________________

90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE
104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff
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  #55  
Old 07-25-2019, 07:50 PM
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Join Date: Jan 2012
Posts: 7,534
Typed the numbers so others can search

Side bearing , cone M806649 Timkin

Side bearing , race LM806610 Timkin


The fronts are probably special made for MB given how thick the race is
Front pinion bearing , cone BT1B 329120/ Q SKF BRAND

Front pinion bearing , race M86610/2/QCL7C SKF BRAND


Rear pinion bearing , cone 4T-M80204BV3 ? brand

Rear pinion bearing , race 4T-M802011 ? brand
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  #56  
Old 07-25-2019, 08:20 PM
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Join Date: Oct 2004
Posts: 4,177
Quote:
Originally Posted by 97 SL320 View Post
? brand
I'm fairly certain they were also SKF

__________________

90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE
104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff
Reply With Quote
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