The injector that is blowing bubbles might also be allowing coolant into the cylinder. There is a brass sleeve pressed into the head that seals the coolant from the combustion chamber. It is sealed at the bottom by the injector. If there is dirt under the injector it will keep the injector from applying equal pressure all around the bottom where it seals. The same spots that allow the bubbles to come out may also allow the coolant in. Make sure you get the bubbles repaired before using this engine.
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Today's Featured Article - Product Review: Lead Substitutes - by Mike Schordine. Lead was oriinally added to gasoline as an upper cylinder lubricant. It lubes the valves and seats. If you rebuild the motor, you could use hardened seats and valves, and unleaded fuel. But if your old tractor runs good, a simple lead substitute added to the gas is a perfectly reasonable solution. And, if you are like me, your tractor is under cover, but it sits outside. So with every temperature change, the humidity in the air collects in the fuel tank, in the form of water.
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