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Magnetos, Ignition Coils and Spark Plugs Discussion about magnetos, buzz coils, spark plugs, ignitors and low tension coils.

Magnetos, Ignition Coils and Spark Plugs

Fairbanks Morse 1 1/2 Z No Spark


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  #1  
Old 07-18-2016, 03:20:15 PM
wallipro wallipro is offline
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Default Fairbanks Morse 1 1/2 Z No Spark

Hello

I acquired a Fairbanks Morse 1 1/2 Z ( SN:770721) I Think its a 1933-or 34 from my father in law and it does not have spark. I took cover off Mag and tried to clean up points but still no spark. What would be the next Step ? Points are opening and closing, just very new to the hit and miss world and am excited to learn more.

Thanks in advance.
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Old 07-18-2016, 05:15:41 PM
Andrew Mackey Andrew Mackey is offline
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Exclamation Re: Fairbanks Morse 1 1/2 Z No Spark

Your engine was built in 1930, according to F/M. What mag is on the engine? It will either be an Bosch AB33 or 34 a small boxy mag with flat magnets on each side (oscillating mag) or an F/M type R rotary mag (has a high loop horseshoe magnet). According to F/M, you should have the R type. Make sure the points are ABSOLUTELY clean. A white business card placed between the closed points, partially withdrawn, then points opened and card removed. The card should come out clean - no grey or black residue. Point gap should be .015 = or - .001. These mags were known for bad condensers and coils. If you don't get spark after setting the points and making sure they are clean, then there are 2 possibilities. 1) take the mag to a good mag shop - look at the sponsors page here on the Stak. OR 2) replace the mag with a F/M J series mag. The J is much more reliable and should be a bolt on replacement.

Be forwarned that if you indeed have an R type, parts and labor are expensive! They are not user friendly to dis-assemble, and internal parts break easily. F/M almost had as much trouble with the R as that had with the Bosch AB33 and 34s! The j series was a direct factory replacement, and probably will cost less in the long run.

if you indeed do have the AB 33 or 34, same applies - your best bet is to have a professional look it over. removing the magnets creates problems, and taking it apart will drive you nuts - again, internal parts break easily. Not only that parts for them are also expensive! unfortunately, you either have them repaired or replace with the j mag (you will have to alter the mag mount to bolt it up)

Let us know how you make out.
Andrew
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  #3  
Old 07-19-2016, 03:19:03 PM
wallipro wallipro is offline
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Default Re: Fairbanks Morse 1 1/2 Z No Spark

Great Thanks for the info Andrew ! I Have the J Series Mag on there now and will try the points again and see where that gets me. How do you test the condenser and coil ? Is it just a continuity check ?

Thanks again !
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Old 04-24-2018, 12:36:27 PM
wallipro wallipro is offline
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Default Re: Fairbanks Morse 1 1/2 Z No Spark

Just getting back to this project and I have verified that I have spark are there specific instruction or advice for putting magneto back in properly to get timing right ?
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Old 04-25-2018, 12:10:50 AM
cobbadog cobbadog is online now
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Default Re: Fairbanks Morse 1 1/2 Z No Spark

Welcome back, it has been a long time since you last played with this engine. I have no details on timing this engine but someone will be able to guide you correctly. I usually start with the engine at TDC then time the magneto to be just cracking the points open just before TDC. this should get some result if your in a hurry before someone with real knowledge can help. Keep us informed please.
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