Posted by Dell (WA) on February 20, 2013 at 20:32:32 from (174.31.177.101):
In Reply to: Timing on 9N Ford posted by Alexis Zeigler on February 20, 2013 at 18:24:48:
Alexis........the weird 4-nipple frontmount dizzy is timed to 1/4" per picture in I&T FO-4 and points are set to 0.015"; and recommended sparkies are AutoLite 437's at 0.025".
HOWSOMEVERS: there is an external screwdriver timing adjust on the left side of the dizzy body. You doubt? Go look. When the LOW COMPRESSION (6.0:1) 1939 flathead engine was designed, it was designed for 70-octaine gasoline. The quality of gas was variable and the farmer could change the timing of the 4-nipple dizzy by diddlin' the external timing adjust. I'm not certain how much retard the external screw adjust was, but I'm thinkin' 6*-retard. Does this sound like what yer lookin' fer???
And surprizingly enuff, during WW2, Colman white gas was more readily available than rationed 70-octane. You just retarded yer dizzy.
You do know ittza 2-bolt, 15-min job to remove yer 4-nipple dizzy, don't you? Just un-snapple yer capple and letter dangle. Carry yer dizzy into the kitchen table and change/adjust yer points (0.015"). Installation is a reversal of the removal ...except... finger start the 2-bolts and then install yer rotor. Now twist yer rotor so the OFFSET tang drive fits the OFFSET camshaft drive slot. Now tighten yer 2-bolts and re-snapple yer capple. Simple, eh?
Remember to "polish" the INVISIBLE corrosion from between the points (0.015") after installation and adjustment. Me? I use a clean $1-bill clamped between the points and pull. Iff'n yer really cheap, tear a strip from HEAVY brown paper grocery sack and use that.
Recommend you squander $25 (cheap) for the I&T FO-4 manual. It even has pictures fer the reading challenged. ........Dell, yer self-appointed sparkie-meister
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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