Quote:
Originally Posted by JPBrecheisen
I can't say for sure about the relationship between the keyway and the timing mark on the damper but you could check it by doing this:
Take the No.1 plug out (removing them all will make the engine roll over by hand easier) and turn the engine over in its normal rotation until you see the intake valve for No.1 close and a bit further until the piston is at the very top of its stroke. This may take a few tries to get it perfectly at the top. A nice bright pen light should allow you to see the the piston through the spark plug hole as you do this.
With the No.1 piston at Top Dead Center/ Upper Dead Center, the mark/line on the outer portion of the damper should be aligned with "0" on your timing scale. If it is not, there may be an issue with the outer damper. If the key way is wasted you would be able to rotate it back and forth a few degrees with the belt off. If you can't "rock rotate" it back and forth on the crank nose, the key way is probably fine. The one dealt with tuned back and forth without movement of the crank.
Jonathon
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Well I went and did some timing adjustments this morning. Plugged the vacuum advance line and timing light showed the mark dead center on the gage where it was when I switched to HEI. This time I put a vac tester on the manifold and at idle it was showing poor vacuum in the "latent timing" region. I twisted the dizzy counterclockwise, idle came up and so did the vacuum tester. Where the motor seemed happiest the timing mark on the damper is about 1" off the metal gage towards vertical. Backed the idle to 750 rpm and took it out for my typical 5 mile test run. It runs much better with better power and it doest spit at all between shifts like it did before when I drove a tad aggressive. The temp did stay lower longer but it did eventually creep back to 200°. To add it does start differently. Before with a little choke it would take off immediately, now it sounds like the starter is having more difficulty turning the engine once or twice before it takes off.