| 40cpe | -- 06-27-2020 @ 3:26 PM |
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Checking my vacuum advance on a '50 V8 distributor. Using a Mighty Vac I pump it up to about 5 in vac and it slowly returns to 0 in about 3 seconds. Should it hold the vacuum indefinitely, or is it bad?
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| carcrazy | -- 06-27-2020 @ 4:28 PM |
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If you are sure you have no external vacuum leaks, I would say you should replace the vacuum advance can.
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| TomO | -- 06-28-2020 @ 9:10 AM |
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The vacuum advance should be check on a distributor machine by a competent operator. It is very important that it be done this way, because the springs in the loadamatic distributor work with the vacuum advance. The leak down could be normal due to the Mityvac connection to the vacuum advance. Tom
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| 40cpe | -- 06-28-2020 @ 10:07 AM |
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A finger over the end of the tube to the Mityvac shows no leak down in the vac or hose. It holds the vacuum. I have the factory fitting tight and stubbed out at the vacuum can. I'm confident that the supply is leak free. The vacuum canister is still attached to the distributor, so the springs are pulling against it. I was hoping someone knew of a Ford procedure. This message was edited by 40cpe on 6-28-20 @ 10:11 AM
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| TomO | -- 06-29-2020 @ 7:40 AM |
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The Ford recommended procedure is to test and set it on a distributor machine. The shade tree method is to use your timing light to see if the advance is smooth and consistent. Tom
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| 40cpe | -- 06-30-2020 @ 6:48 AM |
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Thank you, Tom.
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