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Magneto problems on '47 C

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JW son

08-01-2001 05:08:33




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My son imagined we were having some problems we really weren't and made the needed adjustments to fix them..... . to make a long story short, now we really have trouble! Oh well, we're both learning anyway so this is another lesson. What we need is some direction on retiming a magneto. The cover of the mag, the one that allows you to look at the coil, etc., was pulled off. New points and rotors were put on and the cap replaced. It was done wrong somehow and now the timing is off. If anyone could tell us how to fix this it would be greatly appreciated. Thank you ver much, in advance.

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Duey (IA)

08-01-2001 19:46:54




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 Re: magneto problems on '47 C in reply to JW son, 08-01-2001 05:08:33  
JW, This is what you probably need. Timing a mag. If you have taken the Mag. apart, the internal gears need to be timed. Remove the large cap and line the C mark on the fiber gear with the marked tooth on the steel gear. Tip- turn the engine backwards to get the steel gear tooth to stop straight up and position the C mark on the fiber gear straight down. This times the rotor to the points. It is pretty simple in theory. Like all four cycles, the piston comes to TDC (top dead center) twice for every time the magneto or distributor rotor goes around. The left side of the engine has a hole in the bell housing where you can see the timing mark on the flywheel. Crank the engine to TDC on the compression stroke and center the fire mark on the flywheel in the hole. It may take a bit of turning and scratching to find the mark. Once you find it, shoot some light colored paint onto the mark so you can find it easily. This mark will also come up every time you hit TDC but you want TDC on Compression stroke on cylinder # 1. Take out the #1 spark plug, and put your thumb over the hole while hand cranking the engine(best to have all the plug wires off while doing this so the tractor doesn't try to fire) , the cylinder will force air past your finger on the compression stroke. The other TDC is the exhaust stroke and has the exhaust valves open so no air out the top. When you feel the air coming past your thumb, look for the fire mark on the flywheel. When this mark is centered in the hole, the rotor on the mag should be just lower than the #1 lug on the mag. Looking at it as a clock, #1 lug should be near 10:00. Just before the lug is a plastic stud called the timing stud. Perfect timing is when the rotor points to the timing stud while the fire mark on the flywheel is centered in the hole. If your rotor points to 5:00 your mag is 180 degrees off and needs to be removed and the coupling turned till you achieve 10:00. If it is not right on the timing stud, you can loosen the mag and rotate it to the correct orientation. Put it all back together and time your spark plug wires 1-2-4-3 clockwise on the magneto cap. If you remove all of the spark plugs, this goes much smoother.
Duey

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Dave in Mo

08-01-2001 09:18:07




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 Re: magneto problems on '47 C in reply to JW son, 08-01-2001 05:08:33  
You really need a manual for the tractor. Call up Norm @ Norm's Toys (219) 342-4545 and talk to him or E-mail Sandy Lake Implement. The book will show you how to line up the lil' gears and set the point gap etc.



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