Theoretically, the points should be just in the process of going from closed to open at #1 TDC. However, it is of no consequence. The timing light is used to adjust that. if you watch the points while you rotate the distributor body, you will see that you can make the points open OR close just be rotating the housing.

Where should the rotor point at TDC?

The rotor button should be pointing to the number 1 position on the distributor cap when the number 1 piston is at top dead center (on the compression stroke). The pistons come up two times during the combustion cycle. Once for the exhaust stroke and again on the compression stroke.

How do you set ignition timing points?

4:467:03How To Set Timing Ignition Timing With A Distributor - YouTubeYouTubeStart of suggested clipEnd of suggested clipAfter youve adjusted the distributor. Check the timing with your timing. Light if the timing is setMoreAfter youve adjusted the distributor. Check the timing with your timing. Light if the timing is set where you want it go ahead and tighten the hold down clamp on the distributor. And youre finished.

How do you make sure you are at TDC?

0:506:01How To: Find Top Dead Center - YouTubeYouTubeStart of suggested clipEnd of suggested clipAs you rotate the engine. Listen. And feel for any air being pushed out of the hole as soon as youMoreAs you rotate the engine. Listen. And feel for any air being pushed out of the hole as soon as you detect the air stop rotating the engine and check the timing marks. Look for the mark on the bouncer.

How do I know if I have TDC on compression stroke?

The balloon or finger will fill up till it gets to (TDC) then it will suck back in. At that point rock back and forth a little till your zeroed in between suck and blow; (it will be real sensitive) and there you have it, top dead center on the compression stroke.

How do you know if your distributor rotor is bad?

2:177:237 Signs Of A Worn Distributor Cap And Rotor-Look Out For Them - YouTubeYouTube

Are both valves closed at TDC?

Its up to you. Both valves should be closed if its TDC at the end of the compression stroke. If its TDC at the end of the exhaust stroke, you should be in the valve overlap zone, with the intake valve partially open and on its way to opening fully, and the exhaust valve partially open on its way to closing.

What stroke is top dead center?

compression stroke There are many reasons why you might need to find an engines top dead center. Top dead center is the point when the piston of the number one cylinder in an engine is at its highest point, and on the compression stroke of the engines four-stroke cycle.

How do I know if my cylinder 1 is TDC?

Once the top dead center timing mark is lined up with the marker on the engine, the motor should now be at top dead center. To verify, shine the flashlight down into the spark plug hole. You should be able to see the top of the piston clearly near the top of the cylinder.

How do I fix my ignition points?

2:304:16Supercheap Auto - YouTubeYouTube