Flat Tire sound, no flat tire???? - Mercedes-Benz Forum
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#1 (permalink) Old 03-17-2010, 08:46 PM
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Flat Tire sound, no flat tire????

Hello
I've owned my 84 300d for about a 1 1/2 years now. I've been going through it and doing all the maintenance stuff, you guy have talked about. I change the oil and filters regularly, fixed the some vacuum problems (locks, and the trans shifting hard), removed the egr. And was going to adjust the vavles this weekend. But on the way home from taking my wife to the doctors, today. About 2 miles from our house. I heard what sounds like a flat tire in the back. So I pulled over at a gas station to check. And all the tires are fine. So I continued to drive home, and the sound also continued. Once at home I jacked each side of the rear and spun the tires in Neutral. It seems like the sound is more from the passager side. But sounds like its coming from the diff. Didn't notice it from the drivers side. Now both half shafts have warn boots. I haven't done any thing back there yet. Figured I start at the front and work back.

So my question is has anyone else ran into this problem, and where should I start Axle or diff?

Thanks
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#2 (permalink) Old 03-17-2010, 08:59 PM
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That just it, the car handles and steers fine. No shaking it's just sounds like it has a flat tire.
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#3 (permalink) Old 03-17-2010, 10:20 PM
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Put it back up (safely) so that you can spin the Wheels powered by the Engine and listen with a Mechanics Stethoscope (cheap at Harbor Freight) and see if you can localize the sound. Or, you could listen as I do with a length of Wooden Broomstick.

You could also check the Rear wheel Beaing end play. You are supposed to use a Dial Inicator for that (also a Harbor Fright item) but if you can feel any play at all just pushing in and out on the Hub by hand.I would be concerned; and have it checked with a Dial Indicator for sure.

Also take a look at the Rear sway Bar Links for breakage or too much play (they are plastic).
Also it could be the Rubber Bushings at the top of your Shock Absorbers has rotted out.

Last edited by 300Dman; 03-17-2010 at 10:26 PM.
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#4 (permalink) Old 03-17-2010, 10:43 PM
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Thanks I'll try that tomorrow afternoon. I have the tools you mentioned. So that no problem. Also going to change out the diff fluid. To see if I can find anything in there.
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#5 (permalink) Old 03-18-2010, 05:03 AM
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I have the same phantom noise in my new(er) 84. It did it once after taking a harder than normal left. I put it up on the lift and checked for any problems. I found a ripped boot on my passenger side axle. While spinning it, at one point there's a very light "chop" sound which under weight could certainly sound like the flat tire "flop" sound, I figure.

I lowered it back down, and drove it again... and couldn't get it to make the noise again. Mind you, it was about 5 miles I drove it with the noise before, so I was pretty surprised to not hear anything... I drove it another 2.5 weeks without hearing a sound... until yesterday, I took a right quicker than I normally do (I live in the sticks, it's part of the fun!) not overly aggressive or anything but boom, sound came back again.

I'm going to buy an axle today. I knew I was going to be buying one, since I saw the boot was ripped, but I have a hard time replacing something that's not even making noise. Thrifty or stupid, I'm not sure. Perhaps a bit of both! I'll keep you posted on my findings too.

Dave aka Ghan
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#6 (permalink) Old 03-18-2010, 11:32 AM
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Quote:
Originally Posted by fuzzyredhelmet View Post
Hello
I've owned my 84 300d for about a 1 1/2 years now. I've been going through it and doing all the maintenance stuff, you guy have talked about. I change the oil and filters regularly, fixed the some vacuum problems (locks, and the trans shifting hard), removed the egr. And was going to adjust the vavles this weekend. But on the way home from taking my wife to the doctors, today. About 2 miles from our house. I heard what sounds like a flat tire in the back. So I pulled over at a gas station to check. And all the tires are fine. So I continued to drive home, and the sound also continued. Once at home I jacked each side of the rear and spun the tires in Neutral. It seems like the sound is more from the passager side. But sounds like its coming from the diff. Didn't notice it from the drivers side. Now both half shafts have warn boots. I haven't done any thing back there yet. Figured I start at the front and work back.

So my question is has anyone else ran into this problem, and where should I start Axle or diff?

Thanks
Hi
Thump, thump, thump is classic sound when half axle CV joint fails.
Joseph
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#7 (permalink) Old 03-18-2010, 12:20 PM
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Definitely check your axle boots. I'm guessing that they ruptured.

On mine, my boots ruptured and I ended up driving on a torn boot for 1500 miles. I discovered the battle wound when I was home during break.

What I did was fill the boot up with this chevron gear grease. It was thick and goopy and then wrapped the entire joint in duct tape. This held for quite a long time about 3,000 miles in fact.

On a side not I'm having this thunkity thunk noise from the front right of my vehicle. What do you guys think it is?

-Adam

There's something eerily similar about cars and computers.

1985 300D (355,000)

Last edited by areusche; 03-18-2010 at 12:24 PM.
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#8 (permalink) Old 03-18-2010, 04:47 PM
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Ok today I went to the store and got the stuff to change to rear end fluid. But nobody had a 14mm allen wrench. I had to order one from Amazon. So I check the lug nuts, and the suspension parts. All are fine, also it wasn't making the noise when I spun the wheel by hand. So I went for a short drive (1 mile) and the noise was gone. It seems like what Ghaniba was saying is happening here as well. I'll take it to work tomorrow, to see if it happens again.
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#9 (permalink) Old 03-18-2010, 05:04 PM
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I had the same kind of sound only I got bad shaking above 40mph. The culprit in my case seems to have been that the rubber "skirt" that holds the center bearing in place was ripped. I replaced it and it works fine. It didn't appear ripped until I got really close to inspect it so you may want to check it out.

1983 300D turbo
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--

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#10 (permalink) Old 03-18-2010, 05:32 PM
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Quote:
Originally Posted by fuzzyredhelmet View Post
Ok today I went to the store and got the stuff to change to rear end fluid. But nobody had a 14mm allen wrench. I had to order one from Amazon. So I check the lug nuts, and the suspension parts. All are fine, also it wasn't making the noise when I spun the wheel by hand. So I went for a short drive (1 mile) and the noise was gone. It seems like what Ghaniba was saying is happening here as well. I'll take it to work tomorrow, to see if it happens again.
Hi
When you get your wrench, its a good idea to remove the fill plug first. These plugs can be very tight and its important to clean out the plug so that the wrench fits well and all the way in. Otherwise you may round out the plug. You may need a cheater pipe as well as the breaker bar. Some members have even used a jack to force the wrench.

The reason for doing the fill plug first is that if you get the drain plug out and then cant remove the fill plug - you have no way refill it with oil.
Joseph
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