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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

International Harvester M 3hp


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  #1  
Old 08-26-2012, 08:52:22 PM
Jimbob1 Jimbob1 is offline
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Default International Harvester M 3hp

Hello
I need help with this engine it will be my first restoration and im green!
It has no mag and it had a bracket made for a sparkplug , does it need a igniter ? I will post pics. Also I need info on original parts
Thanks Jim
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  #2  
Old 08-26-2012, 09:23:05 PM
Jimbob1 Jimbob1 is offline
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Default Re: IH M 3hp

My pics didn't go threw the first time .
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  #3  
Old 08-26-2012, 11:51:47 PM
Road Torpedo Road Torpedo is offline
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Default Re: IH M 3hp

Acording to that cylinder head, you have an ignitor fired engine.

It should take the IHC type L magneto. The type L is a low tension mag.

On the other hand, if your engine block has mountings for an EK and a fire trip finger, it would be a Type EK high tension magneto fired engine and or the heads have been swapped.

Some guy's actually get crafty enough to make an ignitor fired engine run from an EK type magneto and retrofit an ignitor plate threaded for a spark plug.

The only way to know is to look for a platform on the side of the engine. If there is a flat platform with one bolt hole to the left and one to the right with a big hole through the side of the engine exposing some of the cam gear, you have an ignitor engine.
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  #4  
Old 08-27-2012, 10:22:30 PM
Tom Martin Tom Martin is offline
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Default Re: IH M 3hp

Part of the above response is not true. The first spark plug M's used an American Bosch rotary magneto that mounted in the same place as the low tension magneto. They were used for a few years before the WICO EK came out.
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Old 08-28-2012, 01:54:50 PM
Road Torpedo Road Torpedo is offline
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Default Re: IH M 3hp

Right you are! I had forgot about that version.
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  #6  
Old 08-28-2012, 07:31:19 PM
Jimbob1 Jimbob1 is offline
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Default Re: IH M 3hp

Does that mean both mags will work ?Remember important new and learning as I go

---------- Post added at 07:31 PM ---------- Previous post was at 07:28 PM ----------

Does that mean both mags will work ?Remember im new and learning as I go .
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Old 08-28-2012, 07:57:00 PM
Jimbob1 Jimbob1 is offline
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Default Re: IH M 3hp

Here is a pic of the mag bracket .
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  #8  
Old 08-28-2012, 09:09:01 PM
mccormick98 mccormick98 is offline
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Default Re: IH M 3hp

Only the IHC type L mag will work on an igniter engine
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Old 09-04-2012, 01:28:16 PM
Andrew Mackey Andrew Mackey is offline
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Exclamation Re: IH M 3hp

Your mag mount is for the low tension, Type L mag. It will not spark like a high tension mag. It puts out only about 13 volts, and has to be timed to the igniter. Electrically simple, mechanically complicated. Depending on when your engine was built, it will be either an undershot trip (1918 t0 early 1919), or an overshot trip (mid-1919 to 1923). The overshot uses a different cam profile, and fuel pump, and is relatively easy to get parts for. The undershot type is hard to find parts for, as it had inherent design problems - the reason for it's change to the overshot design type.

The early undershot type igniter was tripped off the exhaust push rod, with an extra machining on the exhaust cam profile. The later overshot type used an eccentric lobe outboard of the exhaust cam lobe, to trip.
Andrew
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Old 01-10-2013, 10:54:24 PM
GreyFergy101 GreyFergy101 is offline
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Default Re: IH M 3hp

So just to be sure, (i am looking at buying a very similar engine) The type L for the IHC engines are a rotary magneto and engage on that cam gear we can see through the hole? cheers
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Old 01-13-2013, 12:03:37 AM
Tom Martin Tom Martin is offline
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Default Re: International Harvester M 3hp

THat is correct, if your engine is an ignitor engine. The later engines with spark plugs and the Bosch rotary magneto used the same mount with an adapter plate about i/4" thick to raise the magneto. The engine pictured in this thread is an ignitor engine as can be determined by the large hole with two studs on the magneto side of the head. The spark plug engines had a threaded hole in the front of the head.
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Old 01-13-2013, 07:23:14 AM
John C Walker John C Walker is offline
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Default Re: IH M 3hp

If you look around you can purchase a reprint of the original M operators manual and parts book. With a little patience these can be one of the smoothest engines ever built.
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Old 01-13-2013, 11:24:06 AM
ravensrayne ravensrayne is offline
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Default Re: International Harvester M 3hp

There are 4 engines in the IHC McCormick Deering model M series: 1 1/2, 3, 6, and 10 hp. They are very sound engines and whenever they are timed correctly they all start and run like a clock. Your M will need the type L mag, and likely an overstrike ignitor. The ignitor for the 1 1/2 and the 3 used the same size and style and will interchange. I couldnt tell from the pics, but you may also need the ignitor trip arm and cam strap. These are available from hitnmiss.com. I purchased one for my 3 hp M and it fit perfectly. If it were me, I would start trying to get an ignitor first, and then work on getting a mag as they are both expensive items. The engine can then be run on a coil and battery until a mag is found. The type L mag is notoriously weak at low speed for startups and I use a battery setup to get mine running then switch to the mag after it is up to speed. here is a vid of my 3 hp: https://www.youtube.com/watch?v=l7HGS7MuN5Q Hope this helps, Tracy
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  #14  
Old 01-13-2013, 08:01:11 PM
ravensrayne ravensrayne is offline
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Default Re: International Harvester M 3hp

Here is an ignitor on ebay
http://ebay.com/itm/Old-IHC-M-Hit-Miss-Gas-Engine-Motor-Spark-Ignitor-Steam-Tractor-Magneto-Oiler-/181041238846

and an L rotary mag
http://ebay.com/itm/Old-IHC-Type-L-Hit-Miss-Gas-Engine-Motor-Magneto-Ignitor-Steam-Tractor-Oiler-/181050995354

and the gear for the mag
http://ebay.com/itm/Old-IHC-M-Hit-Miss-Gas-Engine-Cast-Iron-Magneto-Gear-Steam-Tractor-Ignitor-Oiler-/110998667491
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Old 11-10-2014, 07:03:16 PM
Buster2 Buster2 is offline
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Smile International Harvester M 3hp

I am restoring a 3 HP, 1928 International, McCormick Deering Model M and need a few parts. Hit & Miss has most of what I need, but don't list the governor yoke and weights, and spring, the yoke is broke on mine. I also need all the carburator needles and parts. Just wondering if anyone has a parts pile that may have what I need. Probably gonna need some more stuff, just getting in to it.
Thanks, and have a great day
Buster in L.A. (Lower Arkansas)
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  #16  
Old 11-10-2014, 07:19:15 PM
oldproff oldproff is offline
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Default Re: International Harvester M 3hp

Buster I have a 3hp that I have not started on yet. I have been picking up parts for it on both Ebay and engine ads so they are out there you just have to watch for them. Bill K
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  #17  
Old 11-10-2014, 07:22:46 PM
Buster2 Buster2 is offline
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Default Re: International Harvester M 3hp

Thanks Bill, I have been on the look out, just not much luck yet, keep looking though, never know who has something, lol.
Buster
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Old 11-14-2014, 01:46:06 PM
Andrew Mackey Andrew Mackey is offline
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Default Re: International Harvester M 3hp

Buster2, Give H&M a direct call. He often has parts, not listed in the catalog.
Andrew
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Old 11-14-2014, 01:54:48 PM
Buster2 Buster2 is offline
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Default Re: International Harvester M 3hp

Ok, thanks Andrew, i will do that. Been busy and haven't took time to do much serious looking. Tks again
Buster
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