Fan belt fraying

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ray rovinsky
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Fan belt fraying

#1 Post by ray rovinsky » Thu Jun 09, 2011 2:05 pm

The current belt from a 356 sponsor, began fraying and I removed it before it broke. at about 200miles.Tension is 1/2 to 3/4 inch, correct # of spacers. I installed fan belts on my SCCA Conv D for over 22 years and never had a problem On Cinv D race car, using a gutted 6 volt gen and small aluminum pulley. On Speedster with the current problem 912 case, am using a 912 Generator and stock pulley . The alignment of pulleys seems to be ok and their are no discernable marks, tears on either pulley. Anyone have any ideas.?
ray rovinsky

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Glenn Ring
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Re: Fan belt fraying

#2 Post by Glenn Ring » Thu Jun 09, 2011 2:45 pm

I only use Gates belts. Double and triple check the pulley alignment.
Glenn Ring

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Wes Bender
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Re: Fan belt fraying

#3 Post by Wes Bender » Thu Jun 09, 2011 3:47 pm

Also check the generator pulley halves for cracks. If the alignment is OK (check with a straight-edge), check the crankshaft pulley for any damage in the belt area. SOMETHING is eating on your belt.

Cheers,
Wes
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Bob Campbell
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Re: Fan belt fraying

#4 Post by Bob Campbell » Thu Jun 09, 2011 4:06 pm

Ray,

My first idea is that you got a bad fan belt.

You know what you are doing, so don't start doubting yourself and presume a problem.

If a second, fresh belt gets chewed up, then start looking.

You asked,

Bob
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Jan Ramaker
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Re: Fan belt fraying

#5 Post by Jan Ramaker » Fri Jun 10, 2011 3:36 pm

I had similar problem. Found out pulley halves were bent/warped. New pulleys-end of problem.
Jan Ramaker

ray rovinsky
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Re: Fan belt fraying

#6 Post by ray rovinsky » Sat Jun 11, 2011 10:08 am

Thanks everyone for responding Cleaned everything put a Gates belt on, replaced 1/2 of pulley outside AS that was all I had in my parts bin. If the problem occurs again I will replace bottom pulley and both haves of gen pulley
ray rovinsky

Dick Weiss
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Re: Fan belt fraying

#7 Post by Dick Weiss » Sun Jun 12, 2011 10:39 pm

Ray,

If your crank pulley doesn't have any "chip-outs or burrs" in the Vee, you needn't remove the pulley (your words=bottom pulley).
Usually, the generator pulley 1/2s are the problem over the years if the wrong screwdriver is used in the slot(s) and get distorted and the 1/2s get warped!

Dick

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