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I absolutely agree with both of you,and not to argue, but any idea why his coolant pressure test isn't showing a drop? Is it just the volume of coolant not showing a pressure drop for just a qt/test? I do know in marine engines (can't coolant pressure test as they don't have a radiator) and I...

I would think so. Just make sure you have a way to regulate the air and a way to keep the air from turning the engine over when you bring the pressure up quickly. More than 100psi probably wouldn't hurt a multi as I'm sure it builds way over 100 psi normally but it probably wouldn't make a leak...

I don't have my tester in front of me, but I believe it puts 100psi in the cyl and you read the % leakdown from there. In this case you would be looking more for the signs of air getting into the cooling system than the % as that just indicates the mechanical condition...

Never given that a thought! I will have to keep my eyes out for a junk one! With the that said, if it was mine p, that is how I would proceed. Once you bring the cyl to TDC, you pressurize the cyl, it should show bubbles in the cooling system if you have a problem with a head or gasket.

If it had a leak, yes. But again it should have lost pressure when you pressure checked the cooling system. How long did you leave it, the cooling system, on pressure?

I'm surprised it didn't leak down when you pressurized the cooling system. If it was a gas engine I would say run a leak down test(pressurize the cylinders one at a time) and look for excessive leak down or bubbles in the radiator. I have never seen any kind of adapter(would be the same to check...

Wouldn't a quick coolant pressure check help to determine where the coolant is going? Or at the least, tell you if it holds, most likely it just burped some. With that said, I have seen plenty of gunk in engines that was just a result of not being ran hard or warm enough.