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Rubbing noise at speeds above 60 700

posted by mkleymann on Fri Mar 7 10:06 CST 2003
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Well, folks, my 1990 GLE has some front end damage, right front fender is smashed back slightly, and the front bumper is pushed back and slightly down. With the cruise control set at any speed above 60, when the accelerator backs off (going downhill would be a good example), there is a rubbing/grinding noise, like something spinning is touching something else. It's not a loud noise, but it's noticeable. It's not there under 60, or when accelerating or just holding steady, only during deceleration. Braking has no effect on the sound, so I don't think it's anything in the brake system. Any thoughts on what it might be?

Mike

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Rubbing noise at speeds above 60 700

posted by Aye Roll on Fri Mar 7 10:38 CST 2003
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last visit: Tue Oct 14 21:08 CST 2014

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Check your engine mounts and rear transmission mount. The trans mount is a regular failure item, and the front mounts, while they won't fail in the sense of falling apart, do allow the engine to sit a lot lower and maybe be out of line with the driveshaft center bearing. Front engine mounts when bad also allow the oil pan to get really close to the sway bar- it could conceivably even touch it, though that would surprise me.
The center bearing itself could be at fault as well. Soak it with oil if it looks dry- if that changes or temporarily quiets the sound, plan on replacing it in the next 10,000 miles. Also replace it's rubber carrier.

A quick look up on a lift at the next oil change should be able to confirm which of these things is at fault, if any.
Good luck!
--
Rob Bareiss, New London CT ::: "Roterande Fl�kt Och Drivremmar!"

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Rubbing noise at speeds above 60 700

posted by 740man on Fri Mar 7 20:12 CST 2003
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That is very interesting. I am experiencing the same thing with my 86 740. I can ecpecially hear it when I pass a wall on the freeway and the sound reflects back.
I thought about what it could be and I remenbered that one of the radiator brackets was missing that holds the radiator to the car just under the hood on top, one on each side. I thought maybe the force of the air at high speeds was causing the radiator and shroud on that side to move towards the cooling fan at high speeds and the fan was grindng on the shroud. I took a look at the shroud and sure enough
there are wear marks on it as if the fan blade was gouging it at some point. As of yet, I have not fixed the mount and checked it again, but if you have front end damage as you say, you might have a busted top mount as I do causing that weird hight speed thwapping at 60 MPH as I do. Let me know if your radiator is loose on top as mine is, I would be intersted to know.

86' 740GLE, a $600 miracle car.......

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