Posted by Gene Davis (Ga.) on May 14, 2021 at 16:48:35 from (184.63.214.39):
Up date on this mess. The problem turns out to be a camshaft with the exhaust lobe almost worn off. I measured it against a good one and it was .110 of an inch lower than the lobe on a good cam. The exhaust valve was barely opening and the engine when running was taking in more air through the intake valve than could go out through the exhaust so the excess was passing back by the rings into the crankcase as blow by and there fore pressurizing the crankcase thus forcing oil into the air cleaner elbow through the vent tube from the rocker arm cover.
Original post----
The engine is a single cylinder CV 15 S Kohler and it is about to drive me nuts. History: bought new on a JD 150 hydrostatic mower by a widow lady. Smoked from the beginning and she returned it to the dealer who did virtually nothing. Dealer sold out to mega store crowd and they pretty much told her they did not sell it so they didn't care. She took it to a couple of independent guys who did various things but no joy. She got disgusted and parked it and bought a new Sears mower. After a while she asked me if I wanted it, and of course I did. Well after putting it back together from the last tinkerer it ran but smoked and after a few minutes began smoking badly and almost shut down. I pulled the air filter off and looked into the space and it had large quantity of oil in it. I did some internet research and found that Kohler had some problems with rings not seating from the factory. so I removed the head and checked and sure enough the cylinder walls look like they were polished chrome. I checked for wear and found ~.003, so I honed the cylinder went back with Std rings, lapped the valves and replaced crank seals and all gaskets plus rebuilt the carburetor with a Kohler kit from John Deere. Put motor back on mower and it ran fine for a little while then began the same old mess of oil blowing out into breather tube. I changed the reed on the head for the crankcase vent system because it was standing about .002 of the seat and book says it should be flat, reassembled and started it up same old story. I then replaced the cylinder head with one from a running engine that was doing o k. No joy there also. When I did the crankcase vacuum test as per the Deere svc manual it was showing about 10 inches of pressure on the manometer instead of the 1-4 of vacuum as prescribed. I did a leak down test and it seemed to hold ~90% of the air pressure introduced int the cylinder at 90 PSI and I could not hear any air passing through any where. The crankcase had the right amount of new 10-30,(Kohler recommended oil) wt H D oil and there is no gas smell indicating gasoline in the oil. The oil level in the crankcase drops with the running of it. The valve cover fills up and it pushes the oil through the felt of the breather tube vent oil separator at the top of the cover that is supposed to let the liquid oil drop back int the valve cover and return to the sump. I am about ready to take the proverbial hammer treatment to it and be done with it.
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