When cold why do belts Squeal......
Denny B
squealing belts(fan, powersteering etc) so much more noticeable?
thanks in advance
Denny B
Dean Dardwin
They get stiff, don't flex as well, and therefore slip. If the problem
doesn't go away after the engine warms up, the belt may be glazed and
should be replaced. BTW, serpentine belt systems are generally free from
this problem.
Dean
sbo...@my-deja.com
"Denny B" <dmrb...@sprint.ca> wrote:
> Why when the weather gets real cold -15 deg and below are
> squealing belts(fan, powersteering etc) so much more noticeable?
>
High electrical demand and thick fluids put more of a strain on
accessories. The squealing, though, is a sign of deteriorated and/or
misadjusted belts, or some other component failure - such as a bearing.
Steve
Sent via Deja.com
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Michael David Hamilton
: Why when the weather gets real cold -15 deg and below are
: squealing belts(fan, powersteering etc) so much more noticeable?
One factor is that when it is REALLY cold you usually
have the rear defroster, windshield defroster (fan motor) and
head lights on, plus any other power consuming feature on to make
the weather more bearable. This puts quite a load on the
alternator.
Plus the belts are less flexible thus making less contact
area with the pulleys. Just the bad set of circumstances I
suppose. Let the car warm up for a while before you start the
accessories, or start them one at a time. I know my car does
exactly the same for the first 10 minutes of driving when it get
below -20C.
Mike
--Philip--
>have the rear defroster, windshield defroster (fan motor) and
>head lights on, plus any other power consuming feature on to make
>the weather more bearable.
AND ... one more factor is present in very cold weather. Many areas of the
country spead sand on the roads to improve traction over ice. This sand makes
its way into multigrooved drive belts and imbeds on the drive surface. Sand
doesn't grip steel very well so ... you get squeal. I've tried picking all the
sand out of a set of belts once and all the squeal went away. Timewise, it's
just as well to toss on another belt instead of picking out all the sand
grains.
++++++++++++++++++++
"Ford will absorb the Oldsmobile logo. Henceforth, the new mark will be known
as (blue) OvalMobile"
+++++++++++++++++++++++
-Philip-
"Anything that offends common sense
will be embraced by an intellectual"
Mike Romain
V belts can be tight and start to slip because the sides get polished up
or worn thin enough that the bottom 1/8 inch wide flat is hitting and
doing all the work.
I run a Jeep CJ7 and 'play' in the mud and that polishes up my belts
Real nice. I go through at 'least' 3 a year.
How I test for it is to have it off and cold and try to spin the
alternator pulley by hand. If I can make it slip by hand, then it will
slip under load as the alternator takes a few HP to spin up.
Then it's new belt time.
I used to informally race Mini's on dirt logging/snowmobile trails and
we would back off the belt for the added power. It made a noticeable
difference in those little beasties. ;-)
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail
88 Cherokee 235 AT's
Build and Trips Photos:
http://albums.photopoint.com/j/AlbumList?u=1161190
Randall L. Lengerman
materials, rubber expands when cold and contracts when heated. The belts
warm up, contract slightly, get tighter and quit squealing...
Randy L.
--Philip--
>materials, rubber expands when cold and contracts when heated.
Do you mean to tell me that all this time, I've been harboring a false belief
that water was the only substance that expanded when cooled?
Do point me to your source for this. You can teach an old dog new tricks. :)
Ray L.
>
> Despite all the other replies. The main reason is that unlike many other
> materials, rubber expands when cold and contracts when heated. The belts
> warm up, contract slightly, get tighter and quit squealing...
>
> Randy L.
But the belts are made of Nylon, embedded in rubber. Does Nylon also
expand when cooled?
Stephen M. Henning
<leng...@linkline.com> wrote:
>Despite all the other replies. The main reason is that unlike many other
>materials, rubber expands when cold and contracts when heated. The belts
>warm up, contract slightly, get tighter and quit squealing...
The rubber expands when hot, but the fibers that control the length
don't expand. Hence the girth expands when hot but not the length. The
net result is that the belt fits tighter when hot.
The squealing is a result of:
More load, electrical and fluids,
Stiffness of the belt,
Looseness of the belt.
In all three cases a new belt works better if tensioned properly.
--
Pardon my spam deterrent; send email to shen...@fast.net
Cheers, Steve Henning in Reading, PA USA
Denny B
thank you for the reply, will you let me know
what is a serpentine belt system, sounds like
something useful.
thanks
Denny
"Dean Dardwin" <d...@dxd.com> wrote in message
news:3A3F7B78...@dxd.com...
R. Anton Rave
>Despite all the other replies. The main reason is that unlike many
>other materials, rubber expands when cold and contracts when heated.
>The belts warm up, contract slightly, get tighter and quit squealing...
Somebody finally got it right.
Doesn't anybody remember making a solar powered rubber band engine in
grade school? It's a cardboard or wooden disk with rubber band running
from the circumference to a small crank in the center. The disk is
covered from sunlight except for a 1/4 pie wedge. The rubber bands
exposed to solar heat shrink, while the shaded rubber bands expand.
Headliners that are coming unglued, whether made of polyester cloth or
vinyl, also shrink in the heat.
Stephen M. Henning
>thank you for the reply, will you let me know
>what is a serpentine belt system, sounds like
>something useful.
A serpentine belt system uses one belt to run all over the engine
powering everything imaginable. The unique feature is that it uses both
sides of the belt since it goes around some pulleys one way and other
the other way.
Denny B
i now know what that type of belt is called.
thanks
Denny
"Stephen M. Henning" <pig...@aol.com> wrote in message
news:pighash-AE4197...@news.fast.net...