Vacuum advance question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

KEL · 01-25-2009, 10:17 AM

Hey
How can I tell if my vacuum advance is working BEFORE I put the distributor back in the truck ? I hooked it up to another vehicle, but I don't know how much vacuum I need to pull before this thing should move. Any help would be appreciated.
Thanks guys.

68gmsee · 01-25-2009, 10:28 AM

If you're referring to the movement created by vacuum, it should move by just sucking on the end with your mouth. I use a short piece of hose if it's still on the engine.. Doesn't take a log of vacuum to move it.

If it doesn't move then it's defective.

KEL · 01-25-2009, 10:34 AM

it doesn't move.
glad i asked before re-assembly
thanks for the help

01-25-2009, 10:17 AM	#1
KEL 72 GMC Join Date: Feb 2008 Location: Wells, Maine Posts: 534	Vacuum advance question Hey How can I tell if my vacuum advance is working BEFORE I put the distributor back in the truck ? I hooked it up to another vehicle, but I don't know how much vacuum I need to pull before this thing should move. Any help would be appreciated. Thanks guys.

01-25-2009, 10:28 AM	#2
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: Vacuum advance question If you're referring to the movement created by vacuum, it should move by just sucking on the end with your mouth. I use a short piece of hose if it's still on the engine.. Doesn't take a log of vacuum to move it. If it doesn't move then it's defective.

01-25-2009, 10:34 AM	#3
KEL 72 GMC Join Date: Feb 2008 Location: Wells, Maine Posts: 534	Re: Vacuum advance question it doesn't move. glad i asked before re-assembly thanks for the help



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