03-01-2023, 12:29 PM
If the holes in the distributor base plate are worn and become oval that will cause excessive advance. That in turn will make the engine noisy at higher revs.
I checked the advance on the distributor in our car using a 12V timing light. I connected it to a 12V battery and the No1 plug lead on The Austin. I made a mark on the fan pulley with the engine at approximately No1 TDC. I could then watch the timing change with engine speed. In our case in moved steadily and smoothly.
The advance mechanism of old DK4 distributors is a bit crude, and when worn I suspect they often don't work at all or else go straight to full advance.
I checked the advance on the distributor in our car using a 12V timing light. I connected it to a 12V battery and the No1 plug lead on The Austin. I made a mark on the fan pulley with the engine at approximately No1 TDC. I could then watch the timing change with engine speed. In our case in moved steadily and smoothly.
The advance mechanism of old DK4 distributors is a bit crude, and when worn I suspect they often don't work at all or else go straight to full advance.
Jim