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H magneto timing


 
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BruceS.
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PostPosted: Wed Oct 10, 2012 3:34 pm    Post subject: H magneto timing Reply to specific post Reply with quote

Am timing H engine with mag after rebuild. I followed the IT manual. Cannot get mag to trip on first mark on pulley, but can get it to trip between the two marks, or on the second mark. What is correct?
 
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Janicholson
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Joined: 30 Jan 2004
Posts: 21271
Location: St. Cloud, MN

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PostPosted: Wed Oct 10, 2012 4:44 pm    Post subject: Re: H magneto timing Reply to specific post Reply with quote

The first mark is not TDC. The last mark should be. Advanced timing comes before that, then IIRC a mark for finding the zerk for greasing the pilot bearing. Jim
 
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pete 23
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PostPosted: Wed Oct 10, 2012 5:00 pm    Post subject: Re: H magneto timing Reply to specific post Reply with quote

From factory, H came with two marks close together and one by itself. The two marks, first one to come around in normal direction of rotation is tdc and second is 5 degrees atdc. The lone mark is to grease pilot bearing in clutch. When fire crater pistons are installed the pulley is supposed to be marked 22 degrees before tdc which would be a little over an inch. I remember the M distance, it is 1 7/16 inch but don't remember the H for sure. Time mag to tdc if you like but I much prefer a few degrees after tdc to be safe. They have such a long impulse lag that it will still be more than enough advanced when running. I should add, that on magneto equipped engines IH also made a special impulse coupling available when using fire crater pistons.
 
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davediehl@hotmail.com
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Joined: 04 Nov 2006
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Location: Angola, IN (Northeast Corner)

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PostPosted: Thu Oct 11, 2012 4:03 am    Post subject: Re: H magneto timing Reply to specific post Reply with quote

I poked in video that helped me on my H.
Easier to understand.

 
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BruceS.
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PostPosted: Thu Oct 11, 2012 6:04 am    Post subject: Re: H magneto timing Reply to specific post Reply with quote

Thanks for replies. Based on your comments, I think everything is OK. Great video. Thanks again.
 
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