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#1
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wheel bearing job. need special tools?
i hear a high pitched squeel when i drive. i suspect it is the wheel bearing because the pitch of the sound changes as the vehicle speed changes.
how do i determine which wheel is bad? it looks messy with all the grease involved, is it a hard job? do i need special tools? rodsob
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$500 1982 240d owner "Gunter" 125k miles,4 speed manual crank windows, MB Tex, all original no a/c, daily driver Scorecard so far.... $230 Maaco paint job $27 dimmer switch, $40 shutoff valve, $45 brake MC, $260 calipers, $40 brake hoses, $40 side fender trim, $20 balancing, $109 lifetime alignment, $10 fuel return lines, $115 oil&fuel filters for next 30k miles |
#2
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rodsob
Are you sure its a wheel bearing, is the squeel REAL HIGH piched?, it so, for me, it was a sticking brake calliper. Mine would come and go then once is was still squeeling when I pulled up infront of the house. I jumped out and felt all the wheel covers, right rear was hot, BINGO
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1985 Euro 240D 5 spd 140K 1979 240D 5 spd, 40K on engine rebuild 1994 Dodge/Cummins, 5 spd, 121K 1964 Allice Chalmers D15 tractor 2014 Kubota L3800 tractor 1964 VW bug "Lifes too short to drive a boring car" |
#3
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It is not a difficult job; I did mine last week. The hardest -- or most tedious -- part was removing the brake caliper and flushing the brake fluid, and then bleeding the brakes without assistance.
Be sure to measure out the appropriate amount of grease for each wheel: 60 grams per side. It's also important that you form a "dam" on the lip of the hub in between each bearing, in order to keep the heated grease from flowing away from the bearings. Also, put copious amounts of grease in each bearing...until you see it squeezing out the other side as you pack them. It's a fun job, though potentially messy; I suggest disposable rubber gloves.
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Matt ------ 1995 E300 Diesel (Die Blau Frau) |
#4
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Not very clear yet!
Front of the car- easy just like any other car. Noting, that they suggest a dial indicator for setup. Most people say they can set them up by feel- but ussually error loose. Mercedes does specify a special grease. You need to make sure you get all the old grease out. Rear wheel brgs... It's more advanced and I'd probably say NO. Michael
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Michael McGuire 83 300d 01 vw A4 TDI 66 Chevy Corsa 68 GMC V6 w/oD 86 300E |
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When I did mine I hung the brake caliper from the sway bar with a piece of wire. To hell with disconnecting the line and having to bleed it! Easy job if it's the front. You'll need an allen wrench (6mm if I remember correctly) to loosen the axle nut locking bolt, a 19mm socket and loctite for the brake caliper bolts (there are two), a 15" or larger adjustable wrench for the axle nut, some brakeclean spray to clean the disc up after you're done (greasy job), and a piece of wire to hang the caliper with. The front bearing will fall out in your hand. Then you can use a large screwdriver to punch out the back bearing and seal once the hub is removed. Be carefule not to get any debris or dirt inside the hub, on the bearings, or in the grease, or you have to clean out all the grease and start over. The original grease dam should remain intact unless you disturb it, in which case it is readily apparent how to repair it. Keep it clean!
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1982 Mercedes-Benz 300CD 1982 Mercedes-Benz 240D - stick |
#6
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try the wall test
Try driving close beside a wall with the window down on the side of the wall. If it is a wheel bearing, you should be able to tell by the noise coming from just one wheel. It will not appreciably change pitch with application/release of the brake pedal, but will change with speed. At higher speed, it can be as loud or louder than the engine- almost sounds like you've got mud tires on the highway or something. There are a few tests in the manual regarding supporting the car on jack stands and testing for lateral play and a few other things. They work well...
Fronts are easy, I did mine with my sister's pathetic tool kit and her crappy jack when I bought the car prior to driving it from NJ to GA. I've not done rears on the mercedes yet. just volvos. hmm. Ditto the above; hang the caliper per the haynes manual instructions- don't bother bleeding and such. Mercedes sells a proprietary wheel bearing grease- green I think, but at the risk of being shunned from the board, any high temp wheel bearing grease will do (red, castrol?). Make sure to work the grease into the races very well. Gloves won't work for this job, you must get your hands dirty. My bearings came in a machined metal protector that I was able to use with a mallet to press the bearing. Better than pressing it in unevenly! Wear dirty clothes- you will get some old nasty grease on you. It took about an hour- even having never done them before. I bet I'd be much faster the second time around. Good Luck! Kevin
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Cannondale ST600 XL Redline Monocog 29er 2011 Mini Cooper Clubman 2005 Honda Element EX www.djugurba.com www.waldenwellness.com |
#7
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I think on the grease things..
MB is real specific about NOT mixing greases. So clean the bearings throughly if you are changing. His car is pre-86 so it should NOT have the green grease. Which by the way is a shell grease developed for F-18 wheel brgs. Darn good synthetic grease. Old style was probably a F-16 milspec grease=0) Michael
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Michael McGuire 83 300d 01 vw A4 TDI 66 Chevy Corsa 68 GMC V6 w/oD 86 300E |
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Not that it is the best idea but normally I just set the caliper on the rod between the two tierods. There is no violent hammering or such involved in taking the hub off so I've never had a problem with this. I use Redline Synthetic CV-2 grease, it has a dropping point of 900+*F. One of my bearings on one of the 300Ds had the mercedes green stuff in it but it seemed a little watery, other than that it seemed like great stuff.
Quote:
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Jeff M. Mercedes W123 DIY pages are now located here. 1983 / 1984 300D Sold 2000 CLK430 Cabriolet ~58k Sold 2005 Avalanche 4x4 ~66k |
#9
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Quote:
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Matt ------ 1995 E300 Diesel (Die Blau Frau) |
#10
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I don't think bad bearings give a high pitched squeal, they usually give a rumbling or moaning sound. Rodsob, when was the last time brakes saw maintenance? If the pads are still good, you may want to take the brakes apart, clean all the dust off, and put antisqueal paste or neversieze on the backside of the pads and on the other contact points. This should get rid of the squeal.
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95 E320 Cabriolet, 159K |
#11
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MB brake paste on the cleaned sliding surfaces.
It always amazed me how I can "feel" the difference in the pedal. Michael
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Michael McGuire 83 300d 01 vw A4 TDI 66 Chevy Corsa 68 GMC V6 w/oD 86 300E |
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