I also had a mysterious leak that appeared to be coming out of the bottom of the case. After getting the motor off and investigating further it was actually the lower spigot where the U-bend hose goes from the cylinder to the case. It actually wiggled when I pushed on it. I took off the hose and unscrewed the spigot to inspect for cracking or other damage. There was none. The leaking was coming from it just being a little loose and the water pressure of the water pump was causing it to run down the case and drip. I put some high temp silicone on the threads and put it back in tight this time and no more leaking since.