Magneto coil gap.
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ModelT46
Topic author - Posts: 1627
- Joined: Sun Jan 06, 2019 8:35 pm
- First Name: Darel
- Last Name: Leipold
- * REQUIRED* Type and Year of Model Ts owned: 1910 touring
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Magneto coil gap.
Book states 20 to 40 thousands., with more gap of 6 to 10 thousands on lower side due to weight of the transmission. When can the gap be to much. I put in a new field coil. The transmission is a non starter one from about 1917. The field coil is a single stack. The coil and trans are now in. The gap ended up at 48 thosands at top and close to 60 thousands at the lower side. I know this more than should be. Will the mag still produce current with these larger gaps?. The magnets seem strong.
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Kerry
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- First Name: Frank
- Last Name: van Ekeren
- * REQUIRED* Type and Year of Model Ts owned: 1916 touring, 1916 pick-up, 1924 coupe, 1926 touring, 1927 touring
- Location: Rosedale Vic Australia
Re: Magneto coil gap.
It will only get weaker in voltage as the miles clock up. Why didn't you make it right when it was apart?
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ModelT46
Topic author - Posts: 1627
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Re: Magneto coil gap.
we thought it was closer.
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Susanne
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Re: Magneto coil gap.
You might be able to correct it with a 3rd main cap designed to take up the clearance... but it will then be one of those things you will need to keep an eye on.
.060 is huge, and will mean your mag will be perpetually weak... sorry!!!
.060 is huge, and will mean your mag will be perpetually weak... sorry!!!
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Mark Gregush
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- First Name: Mark
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- * REQUIRED* Type and Year of Model Ts owned: 1925 cutdown PU, 1948 F2 Ford flat head 6 pickup 3 speed
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Re: Magneto coil gap.
The instructions are published in more them one place along with postings here. Do it right the first time.
I know the voices aren't real but damn they have some good ideas! 
1925 Cut down pickup
1948 Ford F2 pickup
1925 Cut down pickup
1948 Ford F2 pickup
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jab35
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Re: Magneto coil gap.
Sorry for the bad result. The gap problem is made worse by the fact magnetic 'coupling' is a function of the square of the gap distance, not a simple linear function of distance. Unfortunately, fixing the gap is a big deal, but likely will be necessary for the engine to run properly. Best, jb.
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Altair
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Re: Magneto coil gap.
Why can't the coils be shimmed to reduce the gap, there are variable thickness shims available that are inserted behind the three bolts holding the coils.
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John kuehn
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Re: Magneto coil gap.
Getting the mag gap is a trial and error adjustment when the engine is on the stand with the pan off. Add the shims then move the engine in the horizontal position to check if if the transmission weight changes the adjustment. If it does go back and add or remove shims accordingly. You can do it also by just installing the flywheel only and then after the adjustment is done add the drums.
Some folks do it that way not realizing that the entire transmission weight will change the adjustment.
Either way you do it that’s the time for trial and error to get a reasonable adjustment like the manual says.
Some folks do it that way not realizing that the entire transmission weight will change the adjustment.
Either way you do it that’s the time for trial and error to get a reasonable adjustment like the manual says.