Posted by Steve@Advance on July 14, 2018 at 08:57:04 from (66.169.147.211):
In Reply to: Cub smoking posted by Grandpa love on July 14, 2018 at 06:32:35:
A few things you can try...
Don't know what oil you run, but 15w-40 diesel oil is a popular oil for the old engines. Be sure the oil is not contaminated with fuel, which happens if running rich, the air filter is clogged, or the choke is not fully opening.
Be sure the crankcase vent is clean.
Running the oil level on the add mark instead of the full mark will help with oil consumption and crank seal leakage. Many older engines with loose bearings will refuse to hold oil to the full mark. Once it drops to the lower level the leaking and smoking will slow to a manageable amount. It takes some time to learn it's habits, just have to keep a close watch on it.
I know the Cub doesn't have a thermostat, and you don't want one on that system, but that is a consideration on an engine with a water pump. Keeping it up to temperature helps with oil consumption and keeping the engine clean.
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