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  #1  
Old 04-29-2011, 09:07 PM
vstech's Avatar
DD MOD, HVAC,MCP,Mac,GMAC
 
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Location: Mount Holly, NC
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Angry my 87 TD has a rolling rumble...

I looked up under the car, and found the differential coated in a tad bit of gear oil...
I'm now putting the car up on ramps, and going to pull the fill plug, then top off the gear oil... I hope that quiets it.

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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  #2  
Old 04-29-2011, 09:35 PM
vstech's Avatar
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Location: Mount Holly, NC
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... 124 fill plug is not the same size as the 123/126... it's smaller. my 14mm socket will not fit.
is it 13?
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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  #3  
Old 04-29-2011, 11:45 PM
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dunno... seems like I used the same for all three(123/24/26). Did you spray the plug out with brake cleaner? I only have one extra large allen wrench that I use for diffs and I have drained from all 3 types.

My '87 diff has a nice rumble.. goodluck
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90 300TE
83 300SD
85 300TD
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  #4  
Old 04-29-2011, 11:48 PM
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I've got a few spares, but I REALLY don't wanna damage this one.
I tried cleaning it and cleaning it. no go.
it would NOT fit. I'll dig in there, and scrape and clean it. tomorrow after work... I hope it makes it...
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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  #5  
Old 04-30-2011, 03:12 PM
vstech's Avatar
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Location: Mount Holly, NC
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... diff is full. and clear fluid.
left rear tire had split and was at the point of showing tread. put new tire on... no change in noise.
I'm thinking it's either a wheel bearing, or center support bearing...
it's all next on my list...

oh. and a new 14mm socket fit like a glove.
no idea what was up with the allen wrench in my kit...
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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  #6  
Old 04-30-2011, 03:53 PM
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Fit like a glove on O.J. Simpson? That might be your problem.

If it changes with throttle it is more likely the shaft bearing, if not then try swerving gently, if that changes it then a wheel bearing.
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  #7  
Old 04-30-2011, 08:27 PM
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Quote:
Originally Posted by babymog View Post
Fit like a glove on O.J. Simpson? That might be your problem.

If it changes with throttle it is more likely the shaft bearing, if not then try swerving gently, if that changes it then a wheel bearing.
X2

Also, how much back lash (play) do you have in the diff ? Try turning the pinion.
While I have never heard of it on a MB, bad spider gears in a diff can make a rumble.
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1967 230-6 auto parts car. rust bucket.
1980 300D now parts car 800k miles
1984 300D 500k miles
1987 250td 160k miles English import
2001 jeep turbo diesel 130k miles
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1968 Ford F750 truck. 6-354 diesel conversion.
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  #8  
Old 04-30-2011, 09:48 PM
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Quote:
Originally Posted by layback40 View Post
X2

Also, how much back lash (play) do you have in the diff ? Try turning the pinion.
While I have never heard of it on a MB, bad spider gears in a diff can make a rumble.
My loud rear diff is very sloppy... I thought it was normal until I got a replacement and saw how tight it was.
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Past
95 E420
87 300D Turbo 5spd
90 300TE
83 300SD
85 300TD
92 400E
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  #9  
Old 05-01-2011, 07:58 AM
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it's hard to describe.
the sound is NOT rpm dependent. totally speed.
I can get no change in pitch from accelerating/decelerating... no change from cornering. I HATE to tear the car down to measure play in all the candidates... ugh.
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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  #10  
Old 05-01-2011, 08:40 AM
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How many miles are on it? When you get under it again grab the driveshaft near the center bearing and see how much play it in it.
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  #11  
Old 05-01-2011, 10:51 AM
Richard Howard
 
Join Date: Nov 2008
Location: Western NC Mountains
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This sounds exactly like what I hear in my '84 W126 300SD... it's speed dependent only, engine revs not involved.

I had an experienced indy MB shop owner drive the car who said it's the front pinion bearing in the differential. He said they'll run this way for a long while if the diff. lube is kept up to proper level and the wear/noise is not really excessive.

Since mine is not too bad I've not felt it necessary to pull the axles, the ring gear, the driveshaft, etc. to replace the bearing. Obviously, if the bearing is worn, its race should be replaced also, which is why the ring gear must come out.

Just keep the gear oil up to proper level and change it at least once a year to get rid of loose metal, however small the particles.
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  #12  
Old 05-02-2011, 02:09 PM
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My 300TD has the same thing...rumble, only related to wheel speed, increases in pitch with higher road speed, doesn't change when I swerve, no change in volume when I coast in neutral. I figure it's gotta be a diff bearing or the center bearing. I realized I really wasn't prepared to change any of those myself right now, so I'm handing it over to the shop for diagnosis. They can no doubt put it up on a lift and run it to find the noise, something I can't safely do at home. It's quite loud and annoying at highway speed.
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  #13  
Old 05-02-2011, 09:24 PM
vstech's Avatar
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since my noise is exactly rotational with wheel speed, I think it's either rear wheel bearing, or axle bearing in the diff.
there is fluid on the passenger's side of diff. on the half shaft, and on the pumpkin.
likely the diff axle bearing is failing, and it's taken out the seal on the diff... allowing oil to seep out.
I'll let it go until I have time to swap diff/axles/subframe parts from my 95TE...
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
Reply With Quote
  #14  
Old 05-02-2011, 10:29 PM
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Quote:
Originally Posted by vstech View Post
I've got a few spares, but I REALLY don't wanna damage this one.
I tried cleaning it and cleaning it. no go.
it would NOT fit. I'll dig in there, and scrape and clean it. tomorrow after work... I hope it makes it...
I shoved a 1/2 inch diameter bolt in mine and welded it in place. It now comes loose easily with an 11/16 wrench.

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