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  #1  
Old 07-02-2008, 01:39 AM
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Loud sreeching sound when accelerating...

Hello,
I've noticed in the last couple months, Sometimes, when I accelerate, there is a horrible screeching sound that stays constant while I accelerate.
When I'm not stepping on the gas, it goes away. Sometime is will go away when I'm turning or for seemingly no reason.
Any obvious answer for this?
Thanks

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  #2  
Old 07-02-2008, 01:45 AM
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Usually the alternator belt. Rub some bar soap on it as a belt dressing to test. You should not be able to turn the alternator pulley by hand using the cooling fins. Adjust belt if loose or change if glazed bad.
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  #3  
Old 07-02-2008, 01:46 AM
Craig
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The model/year would help, but my first guess would be a loose or worn belt.
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  #4  
Old 07-02-2008, 01:57 AM
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Thanks, It's an 1983 300D

Thanks, It's an 1983 300D
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  #5  
Old 07-02-2008, 08:58 AM
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I agree with the belts. You will need to take care of this right away as the alternator belts also turn the waterpump.

To tighten the alternator belt first loosen the three bolts holding the alternator inthe bracket then tighten the adjusting bolt (the long bolt with the inch long nut on it)
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  #6  
Old 07-02-2008, 09:09 AM
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Isn't that long bolt an eccentric bolt? Turning it tightens or loosens the belt tension?
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  #7  
Old 07-02-2008, 09:31 AM
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What model and year of car do you have? Two different tensioners depending on type of a/c compressor.

Doh, never mind, missed the car info
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Last edited by yellowbenz; 07-02-2008 at 09:33 AM. Reason: info already provided
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  #8  
Old 07-02-2008, 09:32 AM
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She said it's an 1983 300D.
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" We have nothing to fear but the main stream media itself . . . ."- Adapted from Franklin D Roosevelt for the 21st century

OBK #55

1998 Lincoln Continental - Sold
Max 1984 300TD 285,000 miles - Sold
The Dee8gonator 1987 560SEC 196,000 miles - Sold
Orgasmatron - 2006 CLS500 90,000 miles
2002 C320 Wagon 122,000 miles
2016 AMG GTS 12,000 miles
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  #9  
Old 07-02-2008, 09:35 AM
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I just went through this problem recently. After replacing the alternator, belt and tensioning it, I now have a screaming water pump. It never ends.
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  #10  
Old 07-02-2008, 11:15 AM
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I have the same problem but think its the tensioner pulley on my 95 E300. Water temp is fine, goes up a little sitting in traffic- right back down on cruising.
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  #11  
Old 07-02-2008, 12:58 PM
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It can also be an ehxaust manafold leak. It will scream under boost conditions. Had an OLD diesel powered UPS truck that I drove and it sounded like the turbo was running without oil. The mechanic would tighten up the ehxaust manafold to the head. Also check the manafold to turbo.

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