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06-12-2010, 08:41 AM
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Join Date: Jan 2005
Location: St. Paul, MN.
Posts: 4,792
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Setting alternator belt tension
What is the correct way to set the tension of an alternator belt?
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06-12-2010, 08:51 AM
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Join Date: Oct 2008
Location: Schaumburg, IL
Posts: 2,053
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I was taught that you want 1/4" deflection max and minimum.
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Tony Phillips
N524AP, RV 9 (tail wheel)
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06-12-2010, 09:26 AM
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Join Date: Jan 2005
Location: Victoria, Canada
Posts: 2,247
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Here's a post I made in 2006 that should help:
"Belt deflection is an unreliable method of tightening the belt.
Instead, use a torque wrench on the pulley belt and adjust the tension so that you get about 12 ft-lbs before the belt slips.
A loose belt can lead to under-voltage or over-voltage from the alternator. Overvoltage is caused by the regulator trying to force more output from the alternator while the belt is slipping. When the belt grabs, it puts a surge of voltage on the bus.
Please don't ask me how I found out!
ref Lycoming s. i. 1129A
Lycoming SI 1129A Accessory Drive Belt Tension
New 3/8? 11-13 ft/lbs 132-156 in/lbs used 3/8? 7-9 ft/lbs 84-108 in/lbs
New ?? 13-15 ft/lbs 156-180 in/lbs used ?? 9-11 ft/lbs 108-132in/lbs
Vern Little 9A"
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V e r n. ====
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RV-9A complete
Harmon Rocket complete
S-21 wings complete
Victoria, BC (Summer)
Chandler, Az (Winter)
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06-12-2010, 09:44 AM
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Join Date: Mar 2007
Location: Sonoma County
Posts: 3,821
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Quote:
Originally Posted by Bob Collins
What is the correct way to set the tension of an alternator belt?
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Lycoming: Apply torque wrench to the alternator pulley nut and turn it in a clockwise direction. Observe the torque shown on the wrench the instant the pulley slips.
Belt width 3/8"....... NEW 11 to 13 ft-lbs. USED 7 to 9 ft-lbs. |
06-12-2010, 10:07 AM
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Join Date: Oct 2008
Location: Schaumburg, IL
Posts: 2,053
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Sorry, belt deflection should only be used for Pilot pre-flight. Got my functions crossed.
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Tony Phillips
N524AP, RV 9 (tail wheel)
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07-01-2012, 01:54 PM
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Join Date: Nov 2010
Location: West Linn, Oregon
Posts: 1,351
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Quote:
Originally Posted by gasman
Lycoming: Apply torque wrench to the alternator pulley nut and turn it in a clockwise direction. Observe the torque shown on the wrench the instant the pulley slips.
Belt width 3/8"....... NEW 11 to 13 ft-lbs. USED 7 to 9 ft-lbs.
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Anyone able to indicate where this is written by Lycoming?
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CharlieWaffles - But you can call me " Mark"
RV-10
N928MT
Flying - AKA Still Tinkering
Build Project Site
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09-02-2012, 11:15 PM
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Join Date: Nov 2005
Posts: 1,256
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Just installed the prop for the last time (I hope, until time for servicing at 72 months), and now need to tighten the alternator belt. Bumping this to see if anyone has a pointer to the Lycoming SI-1129A on this (can't find it on the Lycoming site).
TIA!
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Steve "Flying Scotsman"
Santa Clarita, CA
PP-ASEL, ASES, Instrument Airplane
RV-7A N660WS flying!
#8,000 
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09-03-2012, 05:11 AM
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Join Date: Feb 2005
Location: Abilene, TX
Posts: 724
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PlanePower says this...
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Sam Evans
RV7-A O-360 C/S
VAF#812
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09-03-2012, 09:29 AM
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Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
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Quote:
Originally Posted by CharlieWaffles
Anyone able to indicate where this is written by Lycoming?
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Yes... Lycoming SI 1129 - now up to "B" revision.
But not posted on their web site... 
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Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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09-03-2012, 01:27 PM
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Join Date: Jan 2010
Location: PAWS (Wasilla, Alaska)
Posts: 136
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lycoming SI 1129B
If someone wants it I can e-mail it to them. Russ
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Russell Brown
A&P/IA
"Happiness may never be sensibly pursued as an end in itself, because happiness is the by-product of achievement." -- Northcote Parkinson (paraphrase)
Wasilla, Alaska
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