How to get the correct distributor position at TDC?

You could move the distributor between the two ‘favorite’ positions shown simply by moving the plug leads round one station, then turning the dizzy to realign the correct plug lead with the rotor position. It looks to be 60 degrees between the two. Or you could get a half move (30ish degrees) by shifting the dizzy one tooth on the drive gear.

How to install a distributor and set initial timing?

Leave a little extra room with the spark plug wires to allow freedom of movement in the distributor. For Chevys, be careful to make sure 5 and 7 are installed correctly. If the wires are accidentally switched, the engine will not be happy. Before we try to start the engine, be sure the distributor is connected to switched power.

Do you need to rotate distributor when setting ignition time?

Double check that the aligning marks on the engine, distributor, and primary rotor mark, are all aligned. This will indicate you have installed the distributor correctly. Install the distributor hold down bolt finger tight and slightly loose. You may need to rotate the distributor by hand when setting the ignition time.

Do you need to replace the distributor after replacing the rotor?

You’ll need to install the new distributor following the same direction and amount of rotation of the shaft, but in reverse order. For this purpose, make a second mark on the distributor indicating the final position the rotor points to, after you have removed the distributor. Just make sure you know which are the initial and final rotor marks.

Where is the TDC rotor on a flathead six?

At TDC the rotor is in the one o’clock position. So, adjust the valves, set the timing and I’m ready to fire her up for the first time. I believe that the rotor should be pointing to the number 1 cylinder. Everything I can find says one o’clock for the number one cylinder to fire.

What to do if distributor rotor is not pointing at number one?

If the rotor is not pointing at Number One, you could twist the distributor body, but if it is off by more than one tooth, this will require turning the distributor body too far. Instead, you will need to remove the distributor and repeat the previous process as the rotor is not in the correct position.

Which is the correct position for the distributor?

He goes on to say “With the distributor installed, you should be able to rotate the housing about 25 degrees clockwise and 15 degrees counterclockwise. This will ensure enough room to rotate the distributor to set ignition timing.

What should I do before installing a distributor?

Ensure that the rotor is in the marked position before installing. As noted above, the position of the rotor in the new distributor must match the rotor position in the old distributor exactly or your vehicle won’t be able to start. Ensure your rotor is lined up with the marking you made.

Where to mark the rotor on a distributor?

In other words, mark your old distributor’s rotor position inside the housing of your new distributor and mark the location on the outside of the distributor that lines up with your engine’s mounting point. Ensure that the rotor is in the marked position before installing.