Posted by jimg.allentown on November 30, 2020 at 18:30:10 from (24.115.204.152):
In Reply to: Farmall 300 missing posted by bpanning92 on November 30, 2020 at 08:56:46:
OK, let's get a couple of things straight here.
Points affect ALL cylinders - not just one or two. Same with condensers. Same with distributor bushings. So, now let us get back to basics.
An engine needs THREE things to run: 1) Fuel/air mixture. 2) properly timed spark. 3) Compression.
If you have those three things, the engine will run. Now, as to what is missing. You say that it runs on 2 and 3 but not 1 and 4. That tells you that it is something that is NOT common to the whole engine. That rules out points, condenser, coil, and distributor bushings. It also rules out timing.
You already did say that you have spark at 1 and 4. Check under the cap first to see if there is any moisture or carbon tracking. Then it is time to check for vacuum leaks. With the engine running, spray a bit of carburetor cleaner or starting fluid around the intake manifold. Any sudden change in engine RPM while you are spraying will indicate a vacuum leak.
Next, check your compression. Usually, just listening to the sound as the starter turns the engine will tell you if there is a compression problem. Better to use a gauge, but in a pinch, just using the starter will point out an obvious difference in compression. You should hear a steady loading and unloading as each cylinder passes over TDC on the compression stroke.
There are a number of things that can cause a cylinder to misfire. Spark plug, plug wire, carbon track in the distributor cap, Valves adjusted too tight, burned valves, vacuum leaks, crossed wires, head gasket, and the list goes on. But, those are the major things that will cover most misfiring problems. You need to look for something that is specific to each cylinder that is not firing. Not something that is common to all cylinders.
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