Posted by used red MN on November 08, 2023 at 22:16:07 from (68.46.31.28):
In Reply to: Re: Cub not starting posted by rustred on November 08, 2023 at 18:50:16:
I looked back at some of your other posts trying to get a feel of your knowledge level concerning ignition timing. I want to make sure you understand some things about this. Rustred said get it on TDC of compression, that means the compression stroke of the piston. This means it has to have both valves closed to push air out or build pressure against your thumb and then the piston is brought to the top and the timing marks aligned for timing your mag. Every other time the piston comes to the top of the cylinder it is on the exhaust stroke. It will not push pressure on your thumb on that stroke because the exhaust valve is open. The last thing to be clear on is to make sure the number one piston can pump compression. Do that by pulling the plugs and cranking it over a couple time to make sure it will build pressure against your thumb. Valves can stick on engines that set for a time. Be a good idea to pull all the plugs and check for some amount of compression in all of them. That way you know if that is an obstacle keeping it from starting as well. You have a manual for this tractor? If not go to Farmallcub.c.. I bet you find one there.
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Today's Featured Article - Tuning-Up Your Tractor: Secondary Ignition Wires and Distributor - by Curtis Von Fange. In our last episode we spent the entire day checking out the spark plugs. Is that efficency? Actually, it took more time to explain than it really did to do the inspection. At any rate we decided that a compression test was in order so we could verify the internal engine status. That way we wouldn't buy any tune up parts until we were sure that the engine was in reasonable mechanical condition. Our tests showed a fictional compression reading of 85, 80, 82 and 86 psi. That is well within a
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