I only checked for crankcase leaks because it was so easy once I was hooked up anyway to check for crankshaft seal leaks. Those are crankcase leaks, too, so maybe I'm misinterpreting your question (??). I have no reason to suspect a leak, but since I am building up a mower I want to make sure the engine I use, which came from a scrapped mower, didn't get scrapped because of an engine issue (this particular engine is from a group of six mostly-scrapped mowers I bought as a group). I'm going to check what I can with the engine 100% accessible before I build up the mower. If I can tell that it, needs seals then I'm going to replace them now. Looks like they're fine, but I don't have a feel for how high a crankcase pressure I should use for the leak check. Crankcase pressure when running oscillates between some positive pressure and a vacuum. I suspect it never reaches a very high pressure on the power stroke, but how high?
"I see you have another of these engines, why not check the cc pressure on it and see how close they are?"
I don't understand where you're coming from on this question. Are you sure you understand what my test is doing? The pressure regulator is maintaining the crankcase pressure so it will be the same on every crankcase I check - unless the leak is so bad that the regulator can't keep up with the leakage!! 8^O