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MG MGA - Fan belt squeel

What makes the belt squeel ( tight / loose / dry )?, it stararted last night and drove me mad, Ive also heard of an anti sqeel spray, any good? thank you, Vin
Vin Rafter

Vin,
A loose or worn belt will give this, moreso if you have an electrical load demand, such as lighting (last night?). Hopefully it is not bearings in the dynamo getting tight. I believe the toothed belts are less prone to squeel if you are thinking of replacing if the belt is now too worn to adjust.
regards
Colin
C Manley

Thank you, I have found the culprit, leaking rad squirting water all over including the belt and two days before a long trip too, lucky for me at least I live not too far from Bob West who had one so thats the job for today, Vin
Vin Rafter

Although your problem was caused by water on the belt, a little tid bit to remember is that if the belt ever starts to squeal due to slippage you can hold a bar of soap against the belt for a few seconds and that will usually stop slippage. A little cheaper (and possibly quicker) than using a specialised belt spray.
JM Morris

"A loose or worn belt will give this, moreso if you have an electrical load demand, such as lighting..."

A dynamo doesn't produce the electromotive drag that an alternator does, even when a lot of current is being drawn. Therefor it is not necessary to run with a very tight belt, in fact it is detrimental to run a belt tight with a dynamo in that it will cause accelerated wear on the rear bushing. A toothed belt is beneficial in that it is more flexible than a non toothed belt. See the article Keep Your Belts Loose in the Other Tech Articles section of my web site at: http://homepages.donobi.net/sufuelpumps/ Cheers - Dave
David DuBois

Co;in,
By "toothed belt" I imagine you are referring to a cogged vee belt, ie, it has notches cut into the inner surface. This is to make the belt more flexible, and it can therefore be used on smaller diameter pulleys. Most modern vee belts are of this type.
A toothed belt would normally be a flat belt that drives a pulley with positive location, eg, a timing belt. A toothed belt could have a tensioner pulley running on its top surface.
Time for me to belt up!
Peter.
P. Tilbury

This thread was discussed between 24/06/2010 and 25/06/2010

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