Re: Discussion on point gaps and timing

Posted by jimg.allentown on September 27, 2015 at 18:02:58 from (173.49.143.208):

In Reply to: Discussion on point gaps and timing posted by David G on September 27, 2015 at 11:07:53:

OK, a few points of information here....
First, the CORRECT way to set points is DWELL ANGLE. Period. Gap is simply a near proximity. Ideal dwell is generally 27 to 32 degrees.
Second, changing points requires resetting dwell and timing because points are NOT a precision manufactured part. Tiny differences in rubbing block size and placement will make a difference in dwell and timing. Timing is generally reset after points replacement due to variations in manufacturing tolerances of the points. Therefore, your reasoning on the timing is reversed. Timing check is not a check to verify that all is installed correctly.
Third, timing setting by varying point setting is more exclusive to small single or twin cylinder engines. Not so much for the automotive type of engines in most tractors.
My comment on running on, also known as dieseling is that it can have multiple causes. High idle is a common cause. Carbon buildup in cylinders is another. This can be caused by mixtures too rich as well as continual lugging of the engine from running at RPMs too slow for the loading condition.
Lastly, there are no "one size fits all" cause/effect remedies for every circumstance. There are always those that do not follow the "rules" so to speak. After about 45 years of working with and on engines, I have found that there are really no short answers, and the best method is to roll up your sleeves and do the diagnostics when there is a problem.

Replies:

• Re: Discussion on point gaps and timing David G 18:25:28 09/27/15 (0)

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