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Stationary Engines Discussion Forum

Magneto Timing for IHC LA

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Wade Bittle

10-25-2006 05:49:06

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This is probably an easy one ... I would like to know how to time the magneto for an IHC LA. There is a circle mark on the magneto gear but I could not find a corresponding one on the mag side of the engine drive gear. Also, What should the gaps for the points and plug be set to? Thanks!

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KevinH

10-30-2006 15:52:25

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Re: Magneto Timing for IHC LA in reply to Wade Bittle, 10-25-2006 05:49:06

Have you got your engine timed yet? I have a pretty good method to do it, but it takes a paragraph or two to explain it. Shoot me an email if you still need help, and I'll try to help you out.
Kevin

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Wade

10-30-2006 17:35:06

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Re: Magneto Timing for IHC LA in reply to KevinH, 10-30-2006 15:52:25

Thanks Kevin:

It sounds as though you just set it at TDC when the low speed lever trips. That is about where it was set originally but I wasn't sure if someone had monkeyed with it. I can not get it started and thought that there might be a timing issue. I wanted to check if there were alignment marks to verify the timing. I have a 1918 IHC M that has timing marks for this purpose. One on the flywheel and one on the block.

The spark is very weak and that might be the reason for hard starting. I think that the magnet needs to be recharged since it feels like it has a weak field.

Regards,

Wade

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KevinH

10-30-2006 17:54:31

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Re: Magneto Timing for IHC LA in reply to Wade, 10-30-2006 17:35:06

The magnets on the mags on those engines do not typically require recharging like some of the older horseshoe type mags. Clean, adjusted points(.013), new condenser(available at any IH dealer..just ask for a mag kit for an H or M Farmall as the H1 is the same internally as the H4 used on the Letter series Farmalls.) Usually this is all that is needed to get a hot, blue spark from one of these mags. Hopefully you have an IH 'H1' mag and not the Wico mag they used on the earlier LA engines. Plug gap is also a factor in one of these not starting well. I believe that .017-.020 is the range you want to aim for. I'd have to dig out my book to be sure. Kevin

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Juan Assanelli

10-25-2006 14:16:45

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Re: Magneto Timing for IHC LA in reply to Wade Bittle, 10-25-2006 05:49:06

Hi friend . si tienes el magneto fuera del motor haz lo siguiente muerde el mag en una morza y hazlo girar .Nota la resistencia del disparador continua girando hasta que escape y salte la cuerda esto le da un fuerte impulso a la armadura del mag para intensificar la chispa y mejorar el momento de arranque elige una salida para el cable N1 pone ahi el cable y gira de nuevo el magneto,hasta que se produzca la chispa
que tomaras como N1, el orden de encendido , para un 4 cil ih es 1 3 4 2 siendo el N1 el mas cercano al radiador
.Ahora bien , debes poner a punto el motor. Sacas la bujia N1 girando el motor a mano , verifica el tiempo de compresion del cil N1. Esto es tope de la carrera de compresion
Trata de ver alguna marca en la polea del cigue�al (marck in the crankshaft pulley or flywheel) si no la hay introduces un destornillador por el agujero de la bujia para tantear cuando el piston esta bien en el tdc
Ahora coloca el mag teniendo con la mano la cupla frente al cable que elegiste como N1 .Saca las demas bujias y gira de nuevo el motor y mira que la chispa del N1 se produzca cuando haya pasado un poco la marca que viste o hiziste para el TDC Verifica el estado y la luz de las bujias colocalas y siguiendo el orden de encendido (firing order) pones los cables ;And gentleman start you engine Good lake Juan Esta puesta pnto es generica y sirve para la mayoria de motores americanos con magneto con disparador tipo Fairbanks Morse , American Bosh IHC

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Bob

10-25-2006 20:08:15

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Re: Magneto Timing for IHC LA in reply to Juan Assanelli, 10-25-2006 14:16:45

Un IH "LA" es un motor del solo-cilindro.

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Juan Assanelli

10-28-2006 10:58:22

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Re: Magneto Timing for IHC LA in reply to Bob, 10-25-2006 20:08:15

Ok thank la puesta a punto de motores con magneto
como dije en mi anterior correo es generica ,sirve para motores de un cilndro hasta para motores de los cilindros que sean ,basta que sean equipados con magneto exterior tales como algunos Wisconsin .que fueron monocilindro Gracias Juan

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Bob

10-25-2006 08:51:19

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Re: Magneto Timing for IHC LA in reply to Wade Bittle, 10-25-2006 05:49:06

Mag timing is EASY for ANY engine with a mag with an impulse, and especially easy for this one-cylinder engine.

Lacking specific instructions or timing marks, set the mag timing so the impulse trips AT, or slightly after TDC on the compression stroke.

Any earlier, it will "kick back", damaging the person cranking it, any later than just after TDC is too late.

Here's a link to a service manual for the mag... you'll have to cut and paste:

Link

It is the "H1" magneto.

The breaker point gap is .013", I BELIEVE the plug gap would be .025".

Hope this helps!

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