I have been running a Pertronix on my 65 Bel Air 230 for the last few years with great results. Early last week, the engine started having occasional stuttering. Then on Thursday I barely made it home....running terrible.
A little troubleshooting showed that my dizzy rotor was loose (rotationally) on the shaft. I could rotate it quite a few degrees without the shaft moving. When I looked inside the rotor, I could see that the notch in the top of the shaft had barely engaged the anti-rotation spline in the rotor and had worn it until it was sloppy.
Turns out the Pertronix magnet collar was keeping the rotor from going all the way down the shaft as it is supposed to and the rotor spline was not fully engaging the notch. So I bought a new cap and rotor and sanded the bottom of the rotor to shorten it a little. Went all the way on the shaft and fit tight. Runs great again.
Oh, one more thing. I noticed the magnet collar did not fit on the dizzy lobes as tight as it should. At the recommendation of a Tech guy at Pertronix, I removed the magnet collar and used a hot soldering iron to very lightly melt a slight line in each of the 6 flats on the inside of the collar. The light melting upset a little plastic on each flat and caused the collar to fit the lobes nice and snug.
Learned a lot about Pertronix today. Works great again and now probably will for a long time.
Good day to all.
