Posted by PAUL W3HGT on August 14, 2011 at 06:46:58 from (67.142.130.19):
Hello, I am a new member here. My son and I are working on a 9N with a front mount distributor and a 12V conversion which we installed this spring. We use it to pull a finish mower for our yard-nothing too strenuous. We installed a new starter and a tune up kit (plugs/wires/cap/condensor/rotor and points). And a new carb, too boot. Maybe in our enthusiasm to "fix up" this tractor, we created more problems for ourselves. The tractor never really ran strong. We even had the local Ford/New Holland dealer work on this, as well. The did another tune up, incorrectly installed a new 6V coil and adjusted the carb. Still no real progress. The tractor ran fine one day, then stalled. We noticed the correct 12V coil was hot to the touch, so we swapped it with another new one. That worked. Then last weekend, while pulling the mower, the tractor started to run rough and backfire. We barely limped it back to the garage. Ran through the tune up specs and now it won't fire up. Weak spark. I read several posts here, Appears coils are a hot topic, as well as the general trouble shooting proceedures. I walked through those--verified the gap, the timing, the contacts (we even got good at removing/installing the distributer/coil as a unit. We did find a bent cinnector on the coil (not the spring pigtail, but the front one). I thought this was going to help, but it did not. We had weak spark, but no start.
Basically what I noticed is that with the distributer on the bench, (for about the 5th time) is that it appears that the rotor is not making physical contact with the brass pad inside the cap for each of the spark plug connectors. I looked at an old cap we had, and they had grooves worn in them.
My questions are this:
1) Is the brass strip in the rotor supposed to come in physical contact with the brass oval contact moulded in the distributor cap?
2.) If is is, and mine is not, how do you remedy this?
(it is a new cap and a new rotor)
3.) Is it likely that the distributor is worn, and not allowing it to make good contact? There is some front to back "slop" on the distributor shaft itself. Also, Once in a while while turning the shaft by hand to visually look things over, it appeared the rotor got "stuck" on the moulded shoulder in the cap, below the contact.
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