Ignition timing
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Mountain Pass
Joined: Feb 2013
Posts: 132
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From: Southern Arizona
Ignition timing
I recently purchased a 1966 F100 with a 4 speed manual and 352 engine. I am trying to get it running for chasing parts while I complete the build on my 1972 F100. I have changed the plugs, points, plug wires, and other minor things. In preparing to check the timing I discovered there is not a timing mark. The pointer is there but not the timing mark. I s this a common thing or do I have an engine that has been modified? Any information will be greatly appreciated.
Tuned
Joined: Feb 2010
Posts: 277
Likes: 21
From: Western Montana
There might be dirt, grease, paint, or rust covering the timing marks. I found mine then used white-out to mark the important lines.
It is also possible that your pulley just doesn't have marks on it. You can adjust timing with a vacuum gauge though.
It is also possible that your pulley just doesn't have marks on it. You can adjust timing with a vacuum gauge though.
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Mountain Pass
Joined: Feb 2013
Posts: 132
Likes: 0
From: Southern Arizona
Thanks for the response, I cleaned the pulley but will make sure that I got all of the grease and rust off to bare metal. How well is the pulley marked? Are the grooves fairly deep or just etches? Also, where can I find directions for setting timing using vacuum if the marks are not there?
Post Fiend
Joined: Apr 2002
Posts: 19,311
Likes: 97
From: Waterloo, Iowa
The marks are there, but are likely very faint. The vacuum gauge method of setting timing works great, though.
Connect to a source of (constant) manifold vacuum. With engine at idle (500-600 RPM) advance distributor clockwise until maximum vacuum indication, about 19" or 20" on a stock engine at sea level. Back off (counterclockwise) about 1" from that, and check for ping or pre-detonation on heavy acceleration. Back off a little more if necessary and/or for safety margin. There's much more to setting engine timing than this, but it will work in a pinch and is a lot easier to set correctly.
Connect to a source of (constant) manifold vacuum. With engine at idle (500-600 RPM) advance distributor clockwise until maximum vacuum indication, about 19" or 20" on a stock engine at sea level. Back off (counterclockwise) about 1" from that, and check for ping or pre-detonation on heavy acceleration. Back off a little more if necessary and/or for safety margin. There's much more to setting engine timing than this, but it will work in a pinch and is a lot easier to set correctly.
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