<VV> Fan Belt Tension

[Mark Durham]

Kevin, its a new, well 1300 miles, Clarks wrapped belt. But will look at it
for any bumps where the fabric has seams. The fan pulley, Generator pulley
are both NOS and run true, the idler pulley is not nos but runs true. I've
got a older cogged belt that came on the car when I bought it that I am
going to reinstall and see what happens. I'm thinking the wrapped belt is a
bit stiff or maybe has a bump as described by several people and just won't
stay quiet on its own. The part of the belt that humms is just before it
starts to bend around the fan pulley on the right side, so the input side
to the pulley, not the output part which I would think a out of true pulley
would cause to humm, but the belt portion going to the alternator is steady
as a rock. Mark Durham

On Wed, Apr 11, 2012 at 7:27 PM, kevin nash <wrokit at hotmail.com> wrote:

>
>
>
> >
> > Message: 1
> > Date: Wed, 11 Apr 2012 16:11:14 -0700
> > From: Mark Durham <62vair at gmail.com>
> > Subject: Re: <VV> Fan belt tension
> > To: Michael Kovacs <kovacsmj at sbcglobal.net>
> > Cc: VV <virtualvairs at corvair.org>
> > Message-ID: <-5941913159328312455 at unknownmsgid>
> > Content-Type: text/plain; charset=ISO-8859-1
> >
> > hum or vibration can be seen reving engine and watching it, n.o
> > vibration/hum with belt removed or tightened tight. Mark Durham
> >
> Mark- It might be that your fan pulley or your idler pulley are somehow
> not spinning true enough to stay quiet, or perhaps your belt has a high or
> lowspot in it that would cause the hum or vibration that you describe. Here
> are some things you might want to check: Take the fan belt off, and spin
> the fan by hand and watch the pulley groove- it better not wobble up and
> down (towards the fan and up away from the fan) or your fan pulley has a
> bend in it and is likely the cause of the hum. I dont know what the
> "acceptable" amount of wobble is, but the stock pulleys are not the most
> accurate pulleys in the world- but they are also not known to be so wobbly
> as to cause the noise you are hearing- unless they have been damaged in
> some way.Also, check the condition of the belt, making sure that there are
> no obvious high or low spots- if there are- figure out WHY, as new fan
> belts dont have those, and if they do, its because the pulleys have some
> sort of problem that is causing the unusu
>  al belt wear.Kevin Nash
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