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| fascinating case of the wandering timing marks https://www.slantsix.org/forum/viewtopic.php?t=7251 |
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| Author: | Johnny [ Thu Oct 16, 2003 10:06 am ] |
| Post subject: | fascinating case of the wandering timing marks |
Gents: just put a new long block 225 in my 73 swinger and it starts and runs beautifully, but when I put a timing light on it just to be sure, the timing mark slowly but steadily precesses counter clockwise as if the pulley were turning at an apparent 5 rpm. Distributor is solid, car starts and runs easily and the problem persisted despite using a different non-adjustable timing light, an old bakelight raygu Sun...only thing I can imagine is that the crank key jumped out as I was pressing on the harmonic balancer and the interference fit allows it to rotate...I'll check that of course, but before I do, any other ideas as to what the heck? Anybody else ever see this? Thanks much John Foyston, Portland OR |
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| Author: | DusterIdiot [ Thu Oct 16, 2003 10:23 am ] |
| Post subject: | Wrong vaccuum port? |
I've had one do this recently where the springs were too light during a recurve, but in your case you're using a std distributor. If the vacuum advance is hooked up did you use the correct port on the carb? Check the keyway, then disconnect the vaccuum source from the dist. while it's running and see if it goes away (running mechanical, and maybe your vacuum advance pod has a slight leak too.). anyone else? -D.Idiot |
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| Author: | slantvaliant [ Thu Oct 16, 2003 11:01 am ] |
| Post subject: | |
I saw some strange things in a 302 Ford - it turned out that the clip holding the vacuum advance arm had come off, allowing the plate to dance about quite freely. |
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| Author: | Charrlie_S [ Thu Oct 16, 2003 3:53 pm ] |
| Post subject: | |
It could be the damper is moving. It is not uncommon for the rubber in the balencer to shear. Take a marker and make a mark on the inner hub of the balencer, and continue the mark right to the outer ring. Start the engine and see if the marks stay aligned. If not the rubber is sheared. |
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