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The heat cycling causes a dormant belt to take a "set" and does not last long after set into active use. |
Is this the type of segmented belt you're talking about?
https://www.harborfreight.com/vibrat...elt-43771.html |
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True!
Mel, you?re right, that belt tied back out of the way gets thermal cycled same as the belt in use (maybe worse, in fact) and it suffers. But even that short life should be plenty to get you home where it?s much easier to install a new, good belt. It can be pretty tough to change a belt on an engine with a constant speed prop when you?re on a ramp far from home. And just for the record, I forgot to get a back-up belt last time I had the (fixed pitch) prop off. My buddy has an RV-6 with a Hartzell and he?s running a segmented belt from, um, I think he said Grainger. I?ll find out.
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V-Belts, Twist-Lock, Trade Size 3L, 3/8" Wide https://www.mcmaster.com/6173K36 |
Ross..... Did Dave install a belt driven alternator after he went EFI?
In the past, Dave machined off the pulley and ran a vac mounted alternator. Grainger also carries a quality link belt. I have carried one for 15 years. If you decide to try one,keep in mind that they are directional. |
I am with Mel. Talking with my IA with 40 years experience all he has noticed about the spare belt concept is the spare is usually in worse shape than the running belt after a couple of hundred hours. Those of you with a tied-off spare take a close look at it next oil change, especially on the narrow (bottom) side. Chances are it's weather checked along with being very stiff and reluctant to go back into it's proper shape. Kinda like a dead cat on the side of the road.
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At 500 hrs, I found that the Dayco Top-Cog belt was missing a few segments (cogs?) and had significant cracking in-between the segments. The belt is available through Amazon or at most auto part stores. The fine print says its made in the PRC (China)?..For the sake of alternator reliability to supply power for both of my electronic ignitions and avionics, a PP alternator with 500 hrs on it, coupled with a automotive belt from the PRC isn't inspiring.....did I mention that I installed a B&C standby alternator...
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Larry |
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