Timing Advance Issue: 1957 F-800
#16
Go back to to square one, put your timing light on it and start bring the RPM up and see if you are getting any advance at higher RPMs. If not it's probably the vacuum advance unit. Replace that if needed first and then recheck. If there is still no advance it could be something in the govenor, which I have no idea how that works.
#17
It is very common for the vacuum diaphrams to dry out, crack and leak vacuum. The best way to test this is with a hand vacuum pump with the engine running and watching a timing light. I know you said you don't have a hand vacuum pump.
I would fully expect that the diaphram is shot, and it needs replacement. You may be able to find a replacement diaphram kit. Back in the day of points distributors and vacuum advance, it was a normal part of the tune up procedure to test the diaphram.
I would fully expect that the diaphram is shot, and it needs replacement. You may be able to find a replacement diaphram kit. Back in the day of points distributors and vacuum advance, it was a normal part of the tune up procedure to test the diaphram.
#18
#19
OOPs I missed where he said it didn't advance with higher RPM..
#20
Ah, OK... So the tach, while nice to have isn't a factor here in the advance mechanism problem. A '57 distributor should have a dual advance type distributor. He should be able to at least clean everything up and make sure the breaker plate slots, springs and weights aren't gummed up or seized. Vacuum advance can can be repaired as someone mentioned.
#21
Ah, OK... So the tach, while nice to have isn't a factor here in the advance mechanism problem. A '57 distributor should have a dual advance type distributor. He should be able to at least clean everything up and make sure the breaker plate slots, springs and weights aren't gummed up or seized. Vacuum advance can can be repaired as someone mentioned.
#25
He has no mechanical advance to worry about...
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