How to determine EXACTLY where TDC is?, Valve adjustment advice needed Options

[JeffBowlsby]

Eyeballing alignment of the rotor to the tick mark on the dizzy body seems so imprecise...for adjusting valves. Is there a method of locating TDC for each cyl PRECISELY?

1. I thought about making some kind of rotor replacement device with a pointer that could extend down close to the tick mark, but thats only good for cyl 1. All cylinders needed.

2. I thought about making a special trigger point plug adapter with three long wires, and attaching it to me DVM on the buzzer setting. When the trigger points would make contact, then that would indicate...? I am not sure that the trigger points make contact at TDC, I think it is at some different point in the cycle.

Any time proven methods?

[JRust]

What I am not seeing is how I adjust the distributor to get my rotor pointed where it is supposed to be? I have top dead center & have my timing mark in the hole. How do I get my rotor to the right position (IMG:style_emoticons/default/confused24.gif)

[realred914]

What I am not seeing is how I adjust the distributor to get my rotor pointed where it is supposed to be? I have top dead center & have my timing mark in the hole. How do I get my rotor to the right position (IMG:style_emoticons/default/confused24.gif)

if the rotor is in the worng location it may be 180 degree off so remove the dizzie and rotate motor crankshaft one full turn, then put dizzie back it should now have the rotor 180degree moved.

if none of these above two posions are correct, then you have the dizzie drive gear in the worn place. for this to be fixxed, you can follow the proceddure in the reapir books for setting up the drive gear. basically you make sure motor is at TDC for #1 (NOT for #3) and set the drive gear in the hole so the dog drive slot is orientated as shown in the pictures most all rebuild books will have. not too difficult to get right, but it is important.