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Alternator belt tension

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hotwheels

Joined: 01 Jun 2007
Posts: 240

Posted: Sat Jul 03, 2010 8:13 pm Post subject: Alternator belt tension

I'm finally ready to complete my B&C L60 alternator installation after a long wait to get a leaking crank seal replaced.



The B&C install manual says to "install the belt and adjust the tension", but adjust to what? They are very specific about bolt/nut torque values, but not about what a properly tensioned belt looks like. Are there tips on how tight is tight enough from others that have already done the install?



Thanks,

Jay

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rv10flyer

Joined: 25 Aug 2009
Posts: 364

Posted: Mon Jul 05, 2010 2:17 pm Post subject: Re: Alternator belt tension

Hope this helps Jay...Install a torque wrench on the pulley retaining nut and measure the amount of torque required to make the pulley slip. Turn the torque wrench in a clockwise direction, as viewed from the pulley end, and adjust belt tension accordingly. 



BELT WIDTH.......NEW BELT........USED BELT 

.....3/8 Inch .....11 to 13 Ft.....Lbs. 7 to 9 Ft. Lbs. 

.....1/2 Inch .....13 to 15 Ft.....Lbs. 9 to 11 Ft. Lbs. 



If a new belt is being installed the slip torque should be checked to the 

used belt specification after 1 hour operation, at 25 hours, and each 

100 hours thereafter.



NOTE: The higher torque value for the new belts is to compensate for 

the initial stretch of the belt that occurs as soon as it is operated. Do 

not use the higher torque value for a belt that has been previously used.

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_________________
Wayne G.

Lew Gallagher

Joined: 04 Jan 2008
Posts: 402
Location: Greenville , SC

Posted: Mon Jul 05, 2010 2:33 pm Post subject: Alternator belt tension

Hey Wayne,



I was curious about that also, so thanks for posting it.



Later, - Lew



do not archive

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_________________
non-pilot
crazy about building
NOW OFICIALLY BUILDER #40549
Fly off completed !

recapen(at)earthlink.net
Guest

Posted: Mon Jul 05, 2010 2:43 pm Post subject: Alternator belt tension

Where did you get this info?  It looks like some pretty good scoop!

---

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pitts_pilot(at)bellsouth.
Guest

Posted: Mon Jul 05, 2010 3:27 pm Post subject: Alternator belt tension

Great info.  Where did those numbers come from?

Linn

do not archive



rv10flyer wrote:

 	  Quote: 	
		   



 Hope this helps Jay...Install a torque wrench on the pulley retaining nut and measure the amount of torque required to make the pulley slip. Turn the torque wrench in a clockwise direction, as viewed from the pulley end, and adjust belt tension accordingly. 



 BELT WIDTH.......NEW BELT........USED BELT 

 .....3/8 Inch .....11 to 13 Ft.....Lbs. 7 to 9 Ft. Lbs. 

 .....1/2 Inch .....13 to 15 Ft.....Lbs. 9 to 11 Ft. Lbs. 



 If a new belt is being installed the slip torque should be checked to the 

 used belt specification after 1 hour operation, at 25 hours, and each 

 100 hours thereafter.



 NOTE: The higher torque value for the new belts is to compensate for 

 the initial stretch of the belt that occurs as soon as it is operated. Do 

 not use the higher torque value for a belt that has been previously used.



 --------

 Wayne Gillispie, A&amp;P 5/93, PPC 10/08

 Grayson, KY  Bldr# 40983

 Ord complete kit 8/24/09; DB Sch del 11/20/09

 Emp 12/01/09-3/14/10 332 hrs

 Wings 3/14/10-





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 http://forums.matronics.com/viewtopic.php?p=303840#303840

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rv10flyer

Joined: 25 Aug 2009
Posts: 364

Posted: Mon Jul 05, 2010 3:55 pm Post subject: Lycoming S.I. 1129

from searching the net. What did everyone do before this little gadget came along? I only wish I had all of that info in my head. I made a copy for myself because I will forget by next year. 



Working on fuel tanks...lovin' the tank sealant and methyl ethyl ketone.

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_________________
Wayne G.

hotwheels

Joined: 01 Jun 2007
Posts: 240

Posted: Tue Jul 06, 2010 1:14 pm Post subject: Re: Alternator belt tension

Thanks for the detailed & timely info! Several offline replies too... This community rocks! Don't know what I'd do without it. My plane would probably fall out of the sky! 



Cheers,

Jay 



Do not archive

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