Date: Wed, 29 Nov 2006 16:56:53 GMT From: th <someguynospamwhere.se> Subject: Re: Terrible Screaming Noise
Fred W wrote: > Eeyore wrote: >> >> danielakers007nospamail.com wrote: >> >> >>> I recently purchased a 1987 Saab 900, 4 door, normally aspirated. I >>> shut it off coming home from work (it was a pretty cold night, but not >>> below 30f I'd say) The next day I started it up and it made a >>> incredibly loud screaming noise (one could say squealing as well). I >>> checked the condition of the belts, they all apear fine, I didn't check >>> the tension though... It seems the noise is coming from the front of >>> the engine, which has me scared since all the moving parts up there are >>> expensive. A few notes about the noise: it makes it wether in gear or >>> not, makes it whether the clutch is engaged or not, and there seems to >>> be no change in loudness or pitch of the noise in any change in the >>> above conditions. >>> >>> PLEASE tell me it's just water on the belts, I live in Oregon, so it's >>> VERY wet here. >>> Any help would be greatly appreciated, as I am only well versed in the >>> workings of the Chevy 350, which the SAAB is, obviously, very different. >> >> >> It's belt tension. >> >> Rubber *expands* when it's cold so the belt loosens and slips a bit >> causing the >> squealing. >> > > I'm afraid not. Rubber has to follow the same rule as all other matter > in the universe and *contracts* when cooled, expanding when heated. The > obvious exception being when liquids change state and become a solid > some do expand. There is one other exception: Water expands when cooled below 4 degrees C. Due to this effect lakes freeze at the surface and we can go skating! -- th
