Drive Belt Squeal - Black Majic 70-1145

3162 Views 6 Replies 6 Participants Last post by TaxiCat, Mar 2, 2007

rciszak

Discussion Starter · Feb 26, 2007

Well I just rebuilt my Primary clutch that was about to blow, and now the drive belt is squealing like a banshee at idle. Not to mention the fact that the sled now has auto pilot... just takes off on it's own at idle... Nice feature...

The spare belt - a Dayco Ultimax 2 #138-4748 runs fine. It had an A/C OEM belt on it when the clutch moveable sheave cracked and took the belt with it.... The Cat belt is -012. Black Majic crosses that to a 70-1145.

Sled is a '95 580 EXT EFI - Six tower clutch - the old style. Total stock setup. Both clutches and shaft have been cleaned, rebuilt this season and secondary moves freely axially.

Does anyone out there have experience with the Black Majic Belts? The Black Majic belt seems very tight - riding high on the secondary.

The Black Majic Belt seems like a good one - just not sure if it's worth messing around with shims...

More riding - less fixing. That's the goal...

Thanks...

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73Lifeliner

· #2 · Feb 26, 2007

My 2007 Z570 LX did a bit of squealing while at idle for the first 75 miles or so. Once I got past that point the noise seemed to go away except on occasion.

Richard

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TaxiCat

· #3 · Feb 26, 2007

Put an oem belt on it.
Aftermarket belts have too many problems with dimensional accuracy to justify the cost savings.
It's always a crap shoot as to what you get and I personally don't have the time to jerk around with several belts untill I find the right one. In the end what have I saved?
The OEM belts have a higher standard of quality control. This means the dimensional accuracy and rubber durometer is consistant.
This is definately the case with Cat and Polaris belts. I can't speak for Doo or Yami.
If you'r not willing to use an oem belt then you need to remove shims from the secondary.

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Beaxch

· #4 · Feb 26, 2007

This is a simple case of your belt deflection being too tight for a new belt. Yes it will go away by itself as the new belt gets prematurely worn, but for better belt life you should set your belt deflection for the new belt. Then as it wears and gets loose you set it back to the way it is now. This setting is in the secondary. I don't know the procedure for your model but it's considered basic maintenance so you should be able to find that info pretty easily. I do prefer OEM belts too because you may not be able to set the belt deflection properly for an aftermarket belt.

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edsled

· #5 · Feb 26, 2007

did you set/change the center-to-center distance b/t the clutches? 12.2" on my zr, i believe yours is the same. also there should be 2 .030" shims b/t the clutch sheeves in the secondary. fewer shims tighten deflection.
changing to a cat belt may solve the problem

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4winds

· #6 · Mar 2, 2007

If you'r not willing to use an oem belt then you need to remove shims from the secondary.[/b]

not correct, to loosen the belt you have to add shims to the secondary which opens the sheves up more.

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TaxiCat

· #7 · Mar 2, 2007

not correct, to loosen the belt you have to add shims to the secondary which opens the sheves up more.[/b]

My fault- You'r 100% correct. I must have been a little dislectic that day. :bash:

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