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?

[TheCabinetmaker]

Dang, there are a lot of different ways to find tdc and adjust valves.

JRust, the two pics on post 17 show the rotor to be pointing toward the # 4 terminal area (I think). The pic of the notch of the van housing shows one of the thick webs. That is not TDC. TDC is about 4 or 5 thin fins to the passenger side of "one" of the thick webs. Either you are not at TDC #1 of compression stroke, or your diz in in wrong. Stick you finger in the #1 plug hole and turn the crank till it blows your finger out the hole. There will be a notch on the edge of the flywheel close to the center line of the crank (assuming your flywheel is so marked). Line up the notch with cl of case (top of engine) and your there. Then make a mark on the bottom of the flywheel. You will have two permanent marks on the flywheel that you can view from the inspection notch on the bottom of the tranni case for future valve adjustments.