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#982171 - 09/05/07 04:26 PM Belt dressing or WD-40?
Benzadmiral Offline


Registered: 10/12/05
Posts: 4007
Loc: Da Swamp
My Buick with the 3.8 has been whistling at me -- a whine on cold startup that lasts for about a minute, then vanishes as (I presume) things warm up. My regular mechanic suggested a quick squirt of WD-40 on the belts and pulleys. The 40 is nice to have around the house, but what about these belt dressing sprays? Any harm possible to modern belts? And should I spritz the belts while the engine is running? Any input welcome!
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#982172 - 09/05/07 04:39 PM Re: Belt dressing or WD-40? [Re: Benzadmiral]
Virtuoso Offline


Registered: 02/25/03
Posts: 2646
Loc: Cow town, NE
I'd skip the WD-40 and belt dressings and opt for a new belt. Or just deal with the whistle.

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#982173 - 09/05/07 04:53 PM Re: Belt dressing or WD-40? [Re: Virtuoso]
Benzadmiral Offline


Registered: 10/12/05
Posts: 4007
Loc: Da Swamp
Actually the noise in question didn't make an appearance on stage this morning, so it may be moot.

In any case it would be a temporary fix, until I can get to my regular shop. I mean, if the belt is squeaking, and the spray quiets it, then we know it's most likely a belt, mais non?
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#982174 - 09/05/07 04:54 PM Re: Belt dressing or WD-40? [Re: Virtuoso]
Eddie Online   happy


Registered: 12/07/03
Posts: 7108
Loc: Florida, Cape Coral
+1 for a new belt. Belt dressing is a very temporary fix and will gum up the pulleys.
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#982175 - 09/05/07 05:02 PM Re: Belt dressing or WD-40? [Re: Eddie]
Kestas Online   content



Registered: 06/04/02
Posts: 11017
Loc: The Motor City
Belt dressing is a no-no for multiribbed belts. It is only meant for single-vee belts.

If you need to test for squeak, use water, not WD-40.

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#982176 - 09/05/07 06:02 PM Re: Belt dressing or WD-40? [Re: Kestas]
Oldmoparguy1 Offline


Registered: 01/21/05
Posts: 4269
Loc: Charlotte, NC
I use WD-40 from time to time to locate such noises. It seems harmless and dissipates fairly quickly without leaving any residue. If you have a serpentine belt on that motor, It's probably due for replacement. My experiance with serpentine belts, (mopar), is that 50% of the time the noise is coming from the ideler/tensioner pully bearing.. YMMV.

Sounds like you have found a keeper. Good luck...
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#982177 - 09/05/07 06:04 PM Re: Belt dressing or WD-40? [Re: Kestas]
Quest Offline


Registered: 12/19/04
Posts: 6869
Loc: beaver land EH?
always against the use of DoubleU-Dee40s on rubber belts for not only will it cause premature deterioriation to the rubber (yes, rubber doesn't like oil-based lubricants).

Instead of resort to quick fixes (which doesn't work properly with serpentine belts anyways), always spend some time looking deeper into the problem and resolve it. Most of the time, the squeaking is an indication of too loose of a belt (if you happened to have the belt replaced recently), greasy pulley surface, seal/bearing problems on belt tensioner, waterpump, alternator, A/C compressor, PwrSteering pump, etc.

If you want to test your belt while your engine is running, try some soapy water instead.
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#982178 - 09/05/07 07:55 PM Re: Belt dressing or WD-40? [Re: Quest]
psudaytona Offline


Registered: 02/16/06
Posts: 936
Loc: Pittsburgh,PA
Avoid WD40 and the belt sprays. They quiet the belt for a few minutes and its then right back and usually worse than before.

I learned this the hard way many times
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#982179 - 09/05/07 08:08 PM Re: Belt dressing or WD-40? [Re: psudaytona]
Dominic Offline


Registered: 07/04/02
Posts: 1790
Loc: Alabama
belts are not salads... say no to dressing.
New belt - $25.
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#982180 - 09/05/07 08:43 PM Re: Belt dressing or WD-40? [Re: Dominic]
ThirdeYe Offline


Registered: 02/23/07
Posts: 7777
Loc: Walker, MI
Quote:

belts are not salads... say no to dressing.
New belt - $25.




Agreed.
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#982181 - 09/06/07 02:18 AM Re: Belt dressing or WD-40? [Re: ThirdeYe]
JohnBrowning Offline


Registered: 05/01/03
Posts: 9448
Loc: USA
Never put belt dressing or any other lube on a serpintine belt!!!! Belt dressing is ok on old school V belts. I have found that if anything cleaning the belt's and pulley of any grease residue helps when nopthing else does. So start the car up and spray some type of cleaner like Greased Lightning, Fantastic,409,Castrol Super Clean,liquid dish soap mixed 50/50 in an old spray bottle etc...... Spary it right on the belts and pulley with the engine off then start and spray some more. Let this stuff run about 10 seconds then start hoseing off the part's that were sprayed.

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#982182 - 09/06/07 04:23 AM Re: Belt dressing or WD-40? [Re: JohnBrowning]
9c1 Offline


Registered: 03/27/03
Posts: 323
Loc: Berwyn, IL
If coolant has gotten on the belt or pulleys, they will squeak. Sometimes a good scrubbing with some of the cleaners JohnBrowning mentions is all it takes -- along with a new belt. Other times the bearings in one or more of the pulleys are going bad and voicing their complaint. Rotate by hand the parts with the drive belt off and carefully feel for roughness in the bearings, also listen carefully. Sometimes one can feel or hear a bad bearing, other times an electronic listening device (professional mechanic tool) is needed. One should check that all the pulleys are in-line using a straight edge. If the mounts for one of the driven items are miss-aligned the belt will voice its own complaint.
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#982183 - 09/06/07 04:36 PM Re: Belt dressing or WD-40? [Re: 9c1]
Benzadmiral Offline


Registered: 10/12/05
Posts: 4007
Loc: Da Swamp
Thanks for all the input,

The noise has vanished, all by itself, and the engine runs quietly and smoothly. I'll keep the WD-40 for other things, and skip the belt dressing!
_________________________
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-- Paul W. (The Benzadmiral)
('11 Buick Regal CXL, charcoal/cream, 2.4L NA)
http://benzadmiral-uncle.blogspot.com/

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#982184 - 09/07/07 01:43 AM Re: Belt dressing or WD-40? [Re: Benzadmiral]
onion Offline


Registered: 02/04/07
Posts: 2097
Loc: kansastan
I've never used belt dressing- I've always just replaced the belt if it made noise. But something strange happened today.

There's a big exhaust fan way up on the back wall of our shop- probably 20 ft. up. The belt has been squealing non-stop for about a month... and nobody seemed to care. I guess it was driving one old timer nuts. He couldn't find any belt dressing... so he grabbed a can of that Permatex Copper gasket dressing. The old ---- climbed up there and sprayed the belt. It was quiet all day.
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#982185 - 09/07/07 07:43 PM Re: Belt dressing or WD-40? [Re: onion]
Donald Offline


Registered: 03/21/04
Posts: 14741
Loc: Upstate NY
I would never use WD-40 on any belt, V belt or otherwise. Its a small amount of lubricant and a lot of carrier (which evaporates, but is not good for any belt).

If you have a serpentine belt, then maybe you should check the idler or tennsion pulleys if you have some noise or w whine.
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