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Old 08-13-2019, 05:32 PM   #6
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Join Date: Jun 2014
Location: Melbourne, Australia
Posts: 4,598
Default Re: model a engine jumps time

FWIW, A friend was describing to me just yesterday that his engine with a high pressure oiling system would change timing as the distributor drive that goes into the valve chamber would move upwards due to the high pressure. The distributor/oil pump drive is held in place only by a spring and the extra load on the skew gear was enough to cause it to rise, thus changing the timing and he'd lose oil pressure because the drive to the oil pump would come apart. Once the timing was off far enough, the motor would slow and things go back to their normal place and function. It took him quite a while to work it out.
Just strap a Model A to your backside and go.
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