<VV> Fan belt tension

[Mark Durham]

Thanks all for your comments, I've recently replaced the alternator fan
( yes the correct one), engine fan pulley and idler fan and bearing as
well as added a harmonic balancer when this engine became a 64-110, so
all is new and looks to be running true. The fan belt vibrates between
the idler and engine fan pulley. Goes away when I tighten the belt up
to original shop manual specs. Mark Durham

Sent from my Windows Phone
From: Rick Norris
Sent: 4/12/2012 3:26
To: corvairduval at cox.net; bryan at skiblack.com; 62vair at gmail.com;
virtualvairs at corvair.org
Subject: Re: <VV> Fan belt tension

May be it was Dynamo hum! From a rancid pancho even.
YLH

Belt hum, fan hum, or bearing hum? Listen at idle and increased rpm with a
rubber hose at each part to see what is the sound you hear.

If you cannot repeat the noise doing this, it may be drivetrain related.
Countershaft hum?

Frank DuVal

Original Message:
-----------------
From: Bryan Blackwell bryan at skiblack.com
Date: Wed, 11 Apr 2012 15:54:54 -0400
To: 62vair at gmail.com, virtualvairs at corvair.org
Subject: Re: <VV> Fan belt tension


I assume you've taken the belt off briefly to verify it's really the belt.
My first thought would be try a different brand of belt.  Second thought is
to run it a smidge looser or tighter to see if that changes things.  Also
check over the pulleys themselves for flaws.

--Bryan

On Apr 11, 2012, at 3:43 PM, Mark Durham wrote:

> ok all, I've got my tension set as described, loose enough to turn the
> fan, however, I have a belt relate hum at the same rpm in each of the 4
> gears. How do you cure that?
> Mark Durham

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