Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help




Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Diesel Discussion

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 12-11-2007, 12:32 AM
Jeremy5848's Avatar
Registered Biodiesel User
 
Join Date: Mar 2006
Location: Sonoma Wine Country
Posts: 8,394
W123 leaking wheel bearing grease?

For the last month or so I've noticed that both front wheels of the '85 seem to be getting especially dirty in the area of the hub (see photo). It looks like grease from the wheel bearing is leaking out and brake dust is collecting on it and making it more obvious. I usually keep the car cleaner than it now appears but we've had just enough rain to make washing the car impractical.

The wheel bearings have not been touched since I've had the car. They're not making any noise. I haven't yet jacked up the car to see whether the wheels will spin freely. The car has just under 230,000 miles total and I have no idea how old the wheel bearings are.

It seems as if the car is trying to tell me something but I don't understand (must be the German accent, hein?). If the bearings are getting hotter than they should be, that would cause the grease to flow, I suppose, and splash out of the bearing. If that is so, then it means I should pull the bearings out to clean and re-grease. Any other diagnoses or comments?

Jeremy
Attached Thumbnails
W123 leaking wheel bearing grease?-img_2315.jpg  
__________________

"Buster" in the '95

Our all-biodiesel family
1995 E300D (W124) . .239,000 miles My car
1996 E300D (W210) . .313,000 miles Wife's car
Santa Rosa population 170,685 (2012)
Total. . . . . . . . . . . . 722,685
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
Reply With Quote
  #2  
Old 12-11-2007, 12:41 AM
pawoSD's Avatar
Dieselsüchtiger
 
Join Date: Oct 2004
Location: Grand Rapids, MI
Posts: 15,035
Mine look like that too, but when I take off the wheel....no signs of grease.

I have a theory that the airflow around the wheels concentrates the brake dust in such a way that it accumulates on that part of the wheel. Maybe a sort of air-cyclone?
__________________
-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 78k - mine - (OC-80,500)
'17 Metris(VITO!) - 8k - wifes (OC-10k)
'01 E320 Wagon - 159k - mine (OC-160,000)
'89 420SEL 166k - mine (OC-167,000)
'01 E320 - 171k - dad's (OC-171,500)
'07 E350 Wagon - 131k - dad's (OC-132,500)
'01 SL500 - 49k - dad's (OC-52,000)
'09 E350 4matic Sedan - 129k - Brothers (OC-128,000)
Reply With Quote
  #3  
Old 12-11-2007, 12:59 AM
Craig
Guest
 
Posts: n/a
If the "dust cover" over the nut is in place there shouldn't be any grease able to find it's way to your wheels. I also vote for brake dust and dirt.
Reply With Quote
  #4  
Old 12-11-2007, 03:09 AM
Registered User
 
Join Date: Jan 2006
Posts: 311
Grab the top of a front tire and push and pull side-to side to feel for looseness (clunking). Stop after driving a while and feel the hubs to see if one is hotter.
Is it on the sunny side? Jack up a front wheel off the ground and spin it to listen for roughness. Steve
Reply With Quote
  #5  
Old 12-11-2007, 03:22 AM
MBeige's Avatar
Registered User
 
Join Date: Apr 2005
Location: SoCal
Posts: 3,746
Mine does that, and coupled with the brake dust, that's a fairly common spot to collect brake dust. Another common spot for brake dust is the wheel lip rim, as well as the spot between that star cap and the wheel where it joins. Finally the third spot where brake dust likes to collect is at the sides of the spokes of these Bundts. PITA to clean each one but well worth it once it's nice and clean.

I know because I just washed my car and had to wipe that spot clean on both sides of the front wheels.

Pop the star cap out and see if there are any leaks. That's the surest way to find out, other than taking that wheel out of course.
Reply With Quote
  #6  
Old 12-11-2007, 07:04 AM
t walgamuth's Avatar
dieselarchitect
 
Join Date: Apr 2005
Location: Lafayette Indiana
Posts: 34,224
If you aren't sure when they have been packed, pack the front bearings with fresh grease. If you do that once every three or four years the bearings will last about forever.

Tom W
__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
Reply With Quote
  #7  
Old 12-11-2007, 08:13 AM
Dee8go's Avatar
Senor User
 
Join Date: Apr 2006
Location: Arlington, VA
Posts: 7,190
Quote:
Originally Posted by Sbean View Post
Grab the top of a front tire and push and pull side-to side to feel for looseness (clunking). . . . Steve
If it's to this point, you'd be replacing the wheel bearing, wouldn't you?
__________________
" The market, like the Lord, helps those who help themselves. But, unlike the Lord, the market does not forgive those who know not what they do."- Warren Buffett

OBK #55

1998 Lincoln Continental - Sold
Max 1984 300TD 285,000 miles - Sold
The Dee8gonator 1987 560SEC 196,000 miles - Sold
Orgasmatron - 2006 CLS500 25,000 miles
2002 C320 Wagon 113,000 miles
Reply With Quote
  #8  
Old 12-11-2007, 10:02 AM
Registered User
 
Join Date: Nov 2002
Location: Dallas
Posts: 802
wheel bearing grease

When I did front bearings I noticed that I had that exact problem for a couple of months and it stopped. I just pulled the weels, simple green degreaser the wheel and outside of the dust cap and cleaned everything up, and that was that - it stopped. I guess it was a little excess oozing from the dust cap.
__________________
~shell
As of 2/2010:
2001 CLK55 0o\=*=/o0
13.6 @ 106mph
10K mi
1984 300SD
260K mi and going and going...
97 S600
46K miles
1991 Sentra SE-R (extremely dorked with)
www.se-r.net
Reply With Quote
  #9  
Old 12-11-2007, 10:06 AM
vstech's Avatar
DD MOD, HVAC,MCP,Mac,GMAC
 
Join Date: Mar 2006
Location: Mount Holly, NC
Posts: 26,290
you would be amazed at how tiny a gap can be "felt" this way. a small amount is acceptable, but any serious clunking, and you will certainly be changing at least the bearings!
__________________
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
  #10  
Old 12-11-2007, 10:16 AM
t walgamuth's Avatar
dieselarchitect
 
Join Date: Apr 2005
Location: Lafayette Indiana
Posts: 34,224
A small looseness will not ruin the bearings for a good while.

Tom W
__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
Reply With Quote
  #11  
Old 12-11-2007, 01:08 PM
Shawn D.'s Avatar
Registered User
 
Join Date: Sep 2006
Location: Alpharetta, GA
Posts: 509
My 300td has this amazing MB-designed grease-leaking feature as well. Just one more reason the wheels look like crap.
Reply With Quote
  #12  
Old 12-11-2007, 01:21 PM
dieseldiehard's Avatar
Dieseldiehard
 
Join Date: Oct 2002
Location: Bay Area No Calif.
Posts: 4,201
Some mechanics tend to overpack the bearings, the factory manual states an amount something like 1.5 oz (in Grams) this can be estimated. Otherwise it expands and comes out and gets all messy like you see.
__________________
'00 E320 (wifes car), '95 E320 Wagon my favorite road car. '99 E300D wolf in sheeps body, '87 300D Sportline suspension, '79 300TD w/ 617.952 engine at 367,750 and counting!
Reply With Quote
  #13  
Old 12-11-2007, 03:19 PM
patbob's Avatar
Its a Whatsit
 
Join Date: Oct 2006
Location: Portland, OR
Posts: 837
Quote:
Originally Posted by Jeremy5848 View Post
For the last month or so I've noticed that both front wheels of the '85 seem to be getting especially dirty in the area of the hub (see photo). It looks like grease from the wheel bearing is leaking out and brake dust is collecting on it and making it more obvious. I usually keep the car cleaner than it now appears but we've had just enough rain to make washing the car impractical.
When I repacked my front wheel bearings over the summer, I noticed the same thing. In my case through, it looked like the wrong grease had been used, causing the more volatile oils in it to creep out and literally drip off the hub. Looked like the previous mechanic had used the ordinary brown bearing grease instead of the green high-temp stuff MB sells.

To weight my grease, I just made a balance scale using a ruler & string, and used some coins as a counter weight.
__________________
'83 300DTurbo http://badges.fuelly.com/images/smallsig-us/318559.png

Broadband: more lies faster.
Reply With Quote
  #14  
Old 12-12-2007, 08:06 PM
Jeremy5848's Avatar
Registered Biodiesel User
 
Join Date: Mar 2006
Location: Sonoma Wine Country
Posts: 8,394
You're right...

...when I popped off the center wheel emblem (both sides), the inside was clean and dry. No grease, no dirt. It is indeed just brake dust on the outside. Tomorrow morning the car gets a bath!

One of those since cable channels needs to do an investigation "How does it work?" on brake dust and how it can end up in strange places. I vote for the "vortex" idea.

Thanks for your insights.

Jeremy
__________________

"Buster" in the '95

Our all-biodiesel family
1995 E300D (W124) . .239,000 miles My car
1996 E300D (W210) . .313,000 miles Wife's car
Santa Rosa population 170,685 (2012)
Total. . . . . . . . . . . . 722,685
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 03:11 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page