Fan belt fraying

356 Porsche-related discussions and questions.
Post Reply
Message
Author
ray rovinsky
356 Fan
Posts: 16
Joined: Sun Nov 09, 2008 11:33 am
Location: peckville Pa

Fan belt fraying

#1 Post by ray rovinsky »

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

User avatar
Glenn Ring
356 Fan
Posts: 955
Joined: Tue Apr 29, 2008 9:54 pm
Tag: On theSamba.com
Location: Long Island, New York
Contact:

Re: Fan belt fraying

#2 Post by Glenn Ring »

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

Restored Bosch Distributors

User avatar
Wes Bender
356 Fan
Posts: 4861
Joined: Wed Aug 27, 2008 10:54 am
Location: Somewhere in the Gadsden Purchase, USA

Re: Fan belt fraying

#3 Post by Wes Bender »

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
Some days it's just not worth chewing through the restraints.....

User avatar
Bob Campbell
Registry Hall of Fame
Posts: 286
Joined: Sun Mar 16, 2008 6:25 pm
Location: Santa Clarita, CA
Contact:

Re: Fan belt fraying

#4 Post by Bob Campbell »

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
Bob Campbell
1956 Porsche Special
1962 S-90 Karmann Hardtop Elec. Sunroof
1964 SC Coupe
1965 C Cabriolet




It's either this or a real job.
http://www.356Services.com

Jan Ramaker
356 Fan
Posts: 3
Joined: Thu Apr 03, 2008 10:30 pm

Re: Fan belt fraying

#5 Post by Jan Ramaker »

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

ray rovinsky
356 Fan
Posts: 16
Joined: Sun Nov 09, 2008 11:33 am
Location: peckville Pa

Re: Fan belt fraying

#6 Post by ray rovinsky »

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
356 Fan
Posts: 4183
Joined: Sun Apr 20, 2008 12:54 am

Re: Fan belt fraying

#7 Post by Dick Weiss »

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

Post Reply