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  #1  
Old 10-21-2004, 11:43 PM
Coming back from burnout
 
Join Date: Jun 1999
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How do I keep exhaust from banging on my rear drive shaft...85 300D...

How do I keep my Exhaust from banging on my rear driveshaft? Is it because my rear springs are too low? When it happens, I shut my car down and restart and it goes away...its driving me crazy!! I have new engine mounts and exhaust hangers..Is this because my exhasut is hung wrong? I would think someone would have this happpen to them

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  #2  
Old 10-22-2004, 12:13 AM
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Location: Evansville, Indiana
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Exhaust must be funky, it shouldn't be hanging free on that car, rather should be pulled up tight against the body "bumpers" -- likely they are missing. Should be a flange by the muffler and a rubber bumper on the body.

check the mount on the tranny, too, might be off and letting the exhaust move too much.

Peter
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  #3  
Old 10-22-2004, 11:50 AM
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Location: Ottawa, Canada
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I had the same problem with the muffler or resinator (the one closest to the engine) contacting the driveshaft. The first step is to get some new heavy duty rubber exhaust donuts. Your old donuts may be missing or deteriorated. Also there is a muffler support near the transmission if I remember correctly. See if these can be adjusted to eliminate contact. If that doesn't work here's my crude and nasty fix, I wired it out of the way. I got a stainless steel rigging turnbuckle at a ship chandler for about $8.00. Then I got some stainless steel wire. Use stainless because you only want to McGyver this thing together once. Use a turnbuckle because you can tighten it at a later date if it sags further and you need more clearance.

There is a metal support flange on the rear of the muffler (at least there was on mine) and there is a hole on the left underside of the car. Run the wire two or three times between the flange and the hole. Have a friend stretch his legs under the passenger side until they contact the muffler. Have him push gently on the exhaust system and hold it while you take up the slack on the wire. Put the turnbuckle in place and slowly tighten. You don't need much to get the desired clearance. Be careful when pushing around an exhaust system you could break a component and they are expensive.
Good luck
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Old 10-22-2004, 01:05 PM
Coming back from burnout
 
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Thanks!!

Thanks for the advice, I will use it.........
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Old 10-27-2004, 09:58 PM
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Caramneow...

I do not beleive it...you are describing a symptom that I might have....I nver posted to the board as I had no way to describe it.

Anyway, after driving for ~20 min at freeway speed, I notice a rattle/humm from the rear left of the car when I step on the accelorator.

When I let off, it goes away for the most part. If I come down an offramp, it turns from a rattle to a soft banging.
When I pull over to stop the car and look underneath, no more noise, even when I drive off...very odd!

Is this what you are experiencing?

AC
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  #6  
Old 10-27-2004, 10:34 PM
"Da Benzito"
 
Join Date: Oct 2004
Location: Durham, NC
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Me too, I am having what seems to be the same problem. Only seem to feel the vibrating/hear the noise when the car has alot of weight in it, like a full car. Took it to one muffler shop and showed him what I thought was causing the problem, but he insisted that when the suspension moves, so does the rest of the car. Tried to get him to cut off my resonsators, but he refused, because he said it was illegal, like he was going to be paying the ticket if I were to get one.
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  #7  
Old 10-28-2004, 05:53 AM
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Location: Littlestown PA ( 6 miles south of Gettysburg)
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Knight Rider 521,
The muffler shop owner was simply protecting his business. You scoff at the idea that he would be paying the ticket. The fact is that mechanics who perform proscribed modifications are held legally responsible. In your particular case, the mechanic may have been wrong, but it is not unheard of for mechanics to be taken to court for unlawful tampering.
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  #8  
Old 12-07-2004, 12:56 PM
Coming back from burnout
 
Join Date: Jun 1999
Location: in the Pacific Northwest
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The noise gets worse with driveshaft rotation--take

your foot off the gas, no matter what speed, and it goes away...for awhile I would simply stop the car, get out, bounce the rear, then bounce the front, and then get back in and drive on, and it would go away..but I dont think this is practical..I'm married now, but if I were 20 years younger and single, this might not make a great impression on a young lady..
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  #9  
Old 12-07-2004, 12:58 PM
Coming back from burnout
 
Join Date: Jun 1999
Location: in the Pacific Northwest
Posts: 2,274
I changed my donuts and re hung my exhaust

and D%^ it came back after 2 months absence. Do I really need NEW SPRINGS?
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  #10  
Old 12-07-2004, 07:43 PM
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I turned up the volume on my radio - it worked for me.

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