Posted by Tom 43 on June 08, 2009 at 09:36:02 from (70.128.127.188):
A friend of mine overhauled his Mustang and at times it idles smoothly and at other times idles rough. It has a valve job, bearings, rings, points, condensor, cap, wires, plugs, rotor etc. Vacuum during cranking is 2 inches and 16 running which seems low. He did not replace the timing chain as he said the marks on the sprockets lined up and the chain wasn't excessively loose.
The intake pushrod just starts to open when the mark on the balancer is at TDC. This seems late to me. The Ford manual does not give a spec.
Why does it run smoothly sometimes and rough other times? We tried a known good carburetor and coil to no avail. What are the symptoms of a chain that has jumped one notch?
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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