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03-08-2019, 07:31 AM
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Join Date: Apr 2010
Location: Covid Country-SoCal
Posts: 1,081
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Mag timing on IO-540
I just had my mags (Bendix 1200 series) overhauled by Aero Accessories in
Van Nuys, CA. Installing them last night, I was unable to get the right mag timed perfectly due to it hitting the standby Alternator. I need to be able to move it a tad more up to get it to sync with the left mag at 25 BTDC. Anyone run into this? I'll call the mag shop when they open but thought I'd throw it out there for now.
-Marc
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RV-10
N814RV
2020 Donation Made
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03-08-2019, 07:32 AM
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Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 2,596
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Take the mag out, turn the gear a little in the direction you need, reinstall the mag and time.
Carl
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03-08-2019, 07:41 AM
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Join Date: Apr 2010
Location: Covid Country-SoCal
Posts: 1,081
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Quote:
Originally Posted by Carl Froehlich
Take the mag out, turn the gear a little in the direction you need, reinstall the mag and time.
Carl
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Bendix mags go into a slot, not a toothed gear. I'm not sure how to clock it differently, other than 180 out.
-Marc
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N814RV
2020 Donation Made
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03-08-2019, 08:09 AM
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Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 2,596
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Sorry - brain fart.
Carl
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03-08-2019, 08:19 AM
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Join Date: Jun 2006
Location: 8I3
Posts: 3,564
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If you have the tool to hold the distributor gear on the red mark, you can turn the gear another tooth and put the holder tool back in to get the mag to clock differently in relation to the stud holding it onto the engine.
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N244BJ RV-6 "victim of SNF tornado" 1200+ hrs, rebuilding
N8155F C150 flying
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Not a thing I own is stock.
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03-08-2019, 08:28 AM
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Join Date: Jul 2009
Location: Mojave
Posts: 4,652
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The drive gear in the case can also be re indexed to get the slot where you need it. It should pull out fairly easily, but be cautious about dropping the bearing into the sump.
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WARNING! Incorrect design and/or fabrication of aircraft and/or components may result in injury or death. Information presented in this post is based on my own experience - Reader has sole responsibility for determining accuracy or suitability for use.
Michael Robinson
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1940 Taylorcraft BL-65
1984 L39C
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03-08-2019, 08:30 AM
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Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 5,297
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Quote:
Originally Posted by Plummit
Bendix mags go into a slot, not a toothed gear. I'm not sure how to clock it differently, other than 180 out.
-Marc
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The slot is in a sub-component that has a gear on the other end of it. It has a pilot bearing loosely holding it into the case. Pull that assembly out and clock that slotted sub-assembly. Be sure to use the pin in the mag when installing.
Larry
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N11LR - RV-10, Flying as of 12/2019
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03-08-2019, 05:29 PM
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Super Moderator
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Join Date: May 2005
Location: Locust Grove, GA
Posts: 2,627
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You've already got great advice here. The gear assembly can be pulled out and turned. However, pull out the rubber cushions first so you don't drop them into the crankcase.
Vic
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 Vic Syracuse
Built RV-4, RV-6, 2-RV-10's, RV-7A, RV-8, Prescott Pusher, Kitfox Model II, Kitfox Speedster, Kitfox 7 Super Sport, Just Superstol, DAR, A&P/IA, EAA Tech Counselor/Flight Advisor, CFII-ASMEL/ASES
Kitplanes "Unairworthy" monthly feature
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Author "Pre-Buy Guide for Amateur-Built Aircraft"
www.Baselegaviation.com
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03-08-2019, 05:36 PM
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Join Date: May 2007
Location: Lakeland
Posts: 53
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Quote:
Originally Posted by vic syracuse
pull out the rubber cushions first so you don't drop them into the crankcase.
Vic
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Absolutely, I learned the hard way.  Not an enjoyable experience.
john
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03-08-2019, 10:35 PM
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Join Date: Apr 2010
Location: Covid Country-SoCal
Posts: 1,081
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Update
I was able to get the mags really close but I want exact. It will get us to the Ice Cream Social tomorrow, but the next time I have the cowl off I will index the mag drive around to be able to get the right mag perfect.
Thanks everyone for your advice! I'll find out the details and post an update when I get 'er done!
-Marc
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RV-10
N814RV
2020 Donation Made
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