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  #1  
Old 03-08-2019, 07:31 AM
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Plummit Plummit is offline
 
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Default 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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  #2  
Old 03-08-2019, 07:32 AM
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Carl Froehlich Carl Froehlich is offline
 
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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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  #3  
Old 03-08-2019, 07:41 AM
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Quote:
Originally Posted by Carl Froehlich View Post
Take the mag out, turn the gear a little in the direction you need, reinstall the mag and time.

Carl
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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  #4  
Old 03-08-2019, 08:09 AM
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Sorry - brain fart.

Carl
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  #5  
Old 03-08-2019, 08:19 AM
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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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  #6  
Old 03-08-2019, 08:28 AM
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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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  #7  
Old 03-08-2019, 08:30 AM
lr172 lr172 is offline
 
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Quote:
Originally Posted by Plummit View Post
Bendix mags go into a slot, not a toothed gear. I'm not sure how to clock it differently, other than 180 out.

-Marc
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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  #8  
Old 03-08-2019, 05:29 PM
vic syracuse vic syracuse is offline
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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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  #9  
Old 03-08-2019, 05:36 PM
N319BC N319BC is offline
 
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Quote:
Originally Posted by vic syracuse View Post
pull out the rubber cushions first so you don't drop them into the crankcase.

Vic
Absolutely, I learned the hard way. Not an enjoyable experience.

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  #10  
Old 03-08-2019, 10:35 PM
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Default 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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