Posted by Red Mist on May 20, 2008 at 17:31:51 from (208.61.169.49):
In Reply to: 140 ignition timing posted by Tracy H on May 20, 2008 at 17:01:09:
Tracy: I re-read your post and I think you are miss-reading your manual, or else it is written incorrectly. The IH Tune-Up Specs manual, GSS1356, states that the INITIAL timing at idle should be 1 degree ATDC, +/- 2 degrees. If it is set there, then the maximum advance will be either 22 degrees or 14 degrees, depending upon serial number. The maximum advance is determined by the slot in the distributor plate, which limits travel of the advance. If you have the original distributor which came new with your tractor, the 22 or 14 degrees will take care of itself if you set the idle timing at 1 degree.
A lot of folks selling distributors on ebay state that theirs fits all letter series farmalls. Well, they do physically fit, but the total advance may be as much as 40 degrees, as an example - from an early H or M. Over time, as the engines in these tractors were tweaked by the factory for more and more power the maximum advance curve was limited more and more by IH. Example: An H, a Super H and a 300 Farmall all have less and less advance built into the distributors, each successive newer model having less than the prior model. There are codes stamped on the flanges of the distributors which, when deciphered, will reveal the total advance of that distributor. See GSS1356 IH manual. mike
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