I mess with a larger Kohler. It sounds like it might be getting a touch tickey as well, but it might also be an exhaust manifold. In the past, I noticed the sump filled up with water when the machine was left out in the rain. That took me 5 oil changes to get clean.have a john deere scots 2048 lawn tractor with kohler cv20s 20 h.p. ohv engine with excessive valve noise. info i,ve found indicates hydraulic lifters but no mention of any valve adjustment. also shows to have pressure lube oil system. need to know what oil pressure should be & if cks. ok am i looking at possible worn lifters, push rods, etc. any help or info greatly appreciated. thanks, jim
It should have a low oil pressure shut-down and you can find pretty comprehensive service manual on line from Kohler.