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| | | | Joined: Oct 2012 Posts: 85 Shop Shark | | Shop Shark Joined: Oct 2012 Posts: 85 | I've been tunning up my 1953...235 engine. Should I be able to see the distributor turn (vacuum advance) when I rev the engine?
I've tried it and it doesn't appear to move. Yet it runs and start great. | | | | | Joined: Jan 2008 Posts: 4,961 'Bolter | | 'Bolter Joined: Jan 2008 Posts: 4,961 | The vacuum control further advances your timing at high vacuum situations. It was mainly designed for a little more fuel economy. Most larger trucks had no vacuum control because they were at full throttle most of the time. The chances are good that you have a ruptured diaphragm or the linkage is hanging. When my jalopies are running good, I leave them alone. | | | | | Joined: Jan 2013 Posts: 1,384 Shop Shark | | Shop Shark Joined: Jan 2013 Posts: 1,384 | The vacuum advance moves the internal parts of the distributor, the outside doesn't move. | | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | The vacuum advance moves the internal parts of the distributor, the outside doesn't move. ??? The vacuum advance unit on a 216/235/261 is attached to the outside of the distributor - you can see the distributor move. The mechanical advance mechanism (weights/springs) are inside the distributor and you cannot see them at work. | | | | | Joined: Mar 2002 Posts: 9,115 'Bolter | | 'Bolter Joined: Mar 2002 Posts: 9,115 | If you disconnect the vacuum line, rotate the distributor and put your finger on the hole, the unit should stay turned. | | |
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