Oh that thing! I am planning (really I am) to take the block to the machine shop and have it thoroughly inspected - mains and all. I'm also going to look into the possibility that the leak is from the gearbox and not the motor. There is no seal on the gearbox input shaft, but there is an oil thrower. I'm wondering if someone may have forgot to replace that at some point. ANyway, I'm still working on it - slowly.