Magneto problems

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geoffrey mark
Posts: 23
Joined: Thu Jan 10, 2019 7:08 pm
First Name: geoffrey
Last Name: mark
Location: northern ireland

Magneto problems

Post by geoffrey mark » Sat Jul 11, 2020 2:56 pm

No spark when switched to mag , removed Bendix and starter and hogs head , see damage to coil insulation beside starter , any fixes for this without removing engine and splitting from transmission ? Thanks


TTFarm
Posts: 12
Joined: Sat Jan 18, 2020 6:22 pm
First Name: James
Last Name: Barker
* REQUIRED* Type and Year of Model Ts owned: 1926 TT
Location: Iowa
MTFCA Number: 50547

Re: Magneto problems

Post by TTFarm » Sat Jul 11, 2020 3:02 pm

One time that problem for me was just a wire needed replacing.


Norman Kling
Posts: 4072
Joined: Tue Jan 08, 2019 1:39 pm
First Name: Norman
Last Name: Kling
Location: Alpine California

Re: Magneto problems

Post by Norman Kling » Sat Jul 11, 2020 4:54 pm

Someone must have tried to remove the starter while the bendix was still in place. It won't come past the coil ring and can very easily damage the ring. The old insulation is usually very brittle and the coils need to be rewound. In order to do that the engine and flywheel must be removed. Then the magneto ring removed and either rewound or replaced with a freshly rewound one. If the engine and transmission are otherwise working well with no issues, you might try using alternate ignition system such as e-timer, distributor, tru-fire or just run on battery. If you drive in relatively flat country, it will run fine on 6 volt battery. However it will be a bit slower starting out and pulling hills.
My suggestion is that if you decide to replace the magneto ring, that you go through the entire engine and transmission while it is out and rebuild or replace anything which is not in good condition. The booklet distributed by the club "Electrical System" gives instructions on how to rewind the coil ring an I have wound 3 different coil rings and they work fine. Or you can purchase a rebuilt one from the parts suppliers.
Norm

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