I made a device to fit where my dump valve goes. I taped up the exhaust and sealed the airfilter with a plastic bag and tape. The device was a tube with a washer welded on top with a tire valve. I then hooked it up to the comprerssor and put a few pounds of pressure through. It showed leaks all over the place, sump gasket , roker gasket exhaust gasket ect. You will obviously have to keep adding air as it will leak out through leaks and exhaust joints but i was only topping it up every minute or so.