I have a 1948 or 1949 8N, I can not read the serial number, that started running badly while I was mowing. I decided it was time to change the points, rotor, distributor cap, plug wires, plugs and condenser. I took the hood and gas tank off the tractor to get to everything. While pulling the front spark plug it came apart and left the bottom half still screwed into the plug hole. I took an e-z-out and removed the threaded part of the spark plug. I also made sure I did not insert the e-z-out too far into the cylinder cavity and hit the top of the piston. And nothing fell into the cylinger. After changing all of these components the tractor started right up. I also changed the oil and filter while I had it down. Anyway, I decided to drive it around the yard a bit before I considered myself finished with the project. After running it for 5 minutes or so I heard a loud noise coming from the front of the engine and fan area. I thought I may have not gotten the fan and shroud and radiator lined up correctly or maybe a bent fan blade hitting the shroud so I PULLED it back into the shop. I did not start it and drive it though. After taking the fan belt off and eliminating that as a possible source of the noise, the noise continued. Any help from you guys is appreciated.
Jerry
Jerry