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Re: Replacing the Vacuum Advance Posted by 900 Aero [Email]  (#425) [Profile/Gallery]
(more from 900 Aero) on Sun, 6 May 2012 12:13:37
In Reply to: Replacing the Vacuum Advance, Roger D  [Profile/Gallery]
, Sun, 6 May 2012 08:15:49
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Roger, If the stamped number on the actuator arm is 2973 you lucked out and found a vacuum advance from an 010 distributor that was part of the 175 HP tuning kit! If the stamped number is 2965 it's just the standard one. As far as swapping the diaphragms here's that portion of my Adjustable Ignition Diaphragm installation and setup instructions! You do not have to remove the distributor from the motor. Remove the two screws holding the diaphragm unit to the distributor, noting the location of any ground wires and the one distributor cap retaining clip that's held on by one of the mounting screws. A hole in the end of arm of the diaphragm unit slips over a pivot pin inside the distributor. Gently wiggle the diaphragm while pushing it sideways towards the motor, when you feel it come off the pin just lift the old diaphragm assembly up from the distributor. The pin is mounted on a movable plate that rotates back and forth a short distance. This is what causes the ignition timing to change so if this plate with the pin does not move freely the distributor will need to be serviced to correct the problem before proceeding further. Now comes the trickiest part of the installation! Getting the eye at the end of the arm to slip over the pin (and stay there!) on the advance plate. You are flying blind here as you cannot see the pin you are aiming for after you move the diaphragm unit into place on the distributor. Before holding the unit up to the distributor with your right hand using a small pocket screw driver or equivalent in your left hand reach through the open area in the distributor and lift up on the pin rotating the movable plate so the pin is at it's highest point. Then with the same small tool hold the plate (pin) steady at that position while fishing and hooking the pin with the vacuum advance in your right hand. You can tell you've got the arm over the pin by gently lifting the unit up and down. My little installation trick is once you have the pin hooked is to pull up and away from the engine to make sure! Then gently hold the diaphragm unit away from the engine while putting the mounting screws back in. I say screw(s) because I install them both even though one has to be remove afterwards to put one of the distributor cap clips back on. I do it this way so the damn thing doesn't come unhooked while fussing with that one distributor cap clip. As a final check to make sure you have the arm on the pin, try to move the reluctor pickup through its normal travel. If it still moves freely the diaphragm arm is not on the pin on the advance plate. If this is the case remove it and try again.
, Sun, 6 May 2012 08:15:49, Sun, 6 May 2012 12:13:37 <-- Viewing This Message, Tue, 8 May 2012 20:11:26, Tue, 8 May 2012 21:00:36
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