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Farmall & IHC Tractors Discussion Forum
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What causes part mag bolts to spin?

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jonnnny2006

06-01-2007 02:25:24




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I wanna know what makes the part the mag mounts into turn? when i took the mag compleatly off and i looked at the part that should turn the mag when correctly instaled that peace dosent spin at all. so what happened was i bolted the mag to a broken driver. i dont know if it is called the driver or not but it is the peace the mag bolts up to. theres a circle hole in the centre and then 2 spots that catch the mag to make it spin. the part i am calling the driver is the part the mag gets its turning ability from, that part dosent spin at all. i call that part the driver for the mag. so the driver dosent spin with the engine. if that cant happen the magneto cant turn. i can turn the mag just fine by hand and it works fine. the tractor part that makes the mag spin isent spinning it self. What are the parts that make the magneto spin comming from the engine? when i have the mag off and crank the engine for 10 seconds the part that would drive the mag does not spin! so i need some help. this what i call a driver looks like it can come off the engine. are there pieces in there that could be the culprit? I'm just hoping that its somthing in there. but it has to get power from somewhere. what all powers the magneto? I need the proper name so i dont keep calling it a driver. any help greatly appreacated. Also have any of you had a magneto not turn by the engine? but you know the mag turns because you turned it in your hand. the tractor is not turning the peace that the mag mates to? inotherwords the tractor peace dosent spin with the motor in fact it spins just interminitly but wont go all the way around. it is like its striped. are there gears that turn the driver that turns the magneto? Just so were all clear on this. I had the mag bolted perfectly with no mistakes to the tractor, and the rotor was a dead givawy somthing that gives the mag its power is not turning. so i took the mag off compleatly and looked at the gizmo that is suposed to mate and in turn make the mag go around. the part is not giving my mag any power it just stays in the same spot. if you cank it for a while it will move a tiny bit. It looks like a keyway sheered. or somthing. but im sure i had the mag put together properly as it gave good spark even at low speed with my hand. The part thats not turning is on the tractor and you should be able to watch it go round and round or otherwise how could you get the mag to work? i would imagin if you wanted to hook up live hydrolics that would not work eather as im not getting power before the mag. so it would not turn anything right now as the piece is not spining like it should

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Steven@AZ

06-01-2007 12:52:51




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 Re: What causes part mag bolts to spin? in reply to jonnnny2006, 06-01-2007 02:25:24  
I'm not saying this to be rude, but you need a shop manual! I&T manuals are somewhat helpful and the IH Blue Ribbon service manuals are quite comprehensive in my experience. Even an owner's manual will help you with some of your terminology.

I would call it the magneto drive, or distributor drive. There should be 4 bolts holding that to the front timing cover of the engine. Remove those four bolts and pull it out, see what is going on behind there. You should be able to see the cam gear and whether or not it is turning when you spin the engine over, and also inspect the teeth.

Was the tractor running and suddenly quit? Or is this a tractor you have not yet had running?

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Haas

06-01-2007 08:07:14




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 Re: What causes part mag bolts to spin? in reply to jonnnny2006, 06-01-2007 02:25:24  
The Mag is driven my a gear that is under the front cover of the engine. The gear is part of the system at the front of the engine that turns the injector pump, and the camshaft. Likely as others said, one or more of the gears has teeth missing. I suppose the front cover is going to have to be pulled off. According to my info there are 5 gears in there. The crankshaft pinion (This gear drives them all), The camshaft gear, the magneto gear, the injector pump gear and an idler gear. As others said, if there is a live hydraulic pump in front of the mag, then the magneto gear is probably stripped. This gear on the MD was not designed for the load of a hydaulic pump.

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gene bender

06-01-2007 03:19:33




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 Re: What causes part mag bolts to spin? in reply to jonnnny2006, 06-01-2007 02:25:24  
Either the gov gear assy has stripped or the camshaft has teeth gone. The driver of the mag as you call it is the gov gear assy it has to be in time with the camshaft gear which has to be in time with the crank. What tractor are you working on as you probably will have to remove front of the motor so you can replace the broken parts and get everything in time again.



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