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Re: spark advance
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Posted by Bob M on February 26, 2007 at 12:28:21 from (151.190.254.108):
In Reply to: Re: spark advance posted by smdv806 on February 26, 2007 at 12:05:06:
If you're talking about radial play in the shaft at at the rotor end of the distributor, just a few thousandths play will have a dramatic effect on breaker point dwell. And this affects hence spark energy and timing (weak spark and timing jumping all over the place). This makes setting the correct point gap impossible and will indeed make the engine lose power, stutter, pop, etc. Incidentally this kind of wear will not ordinarily affect spark advance unless it's worn so bad parts are hitting the inside of the distributor housing. You can verify by putting a timing light on the engine. A worn distrubutor shaft will have the timing mark jumping randomly all over the place. A bad advance OTOH will show a steady mark settled at the wrong timing value. I believe (though am not 100% certain...) distributor assemblies - including the shaft - are interchangeable between the H and the M.
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