Water in the oil of a little C

Got a couple of questions for you all.

I finally had some time yesterday to get out to the shop and do some much needed maintenance on our little C.

When I went to drain the oil for an oil change, and knowing that there was straight 30 weight oil in the case, and it was 20 degrees ourside with several days of -0 temps, I was expecting to see the oil come out as a bit of maple syrup. Imagine my surprise when it ran out like water, with a hint of green at the beginning of the flow!! Guess there's a crack somewhere. (I've only had anti-freeze in the radiator, no water, so I'm not suspecting that the crack "just" occured.) I had seen no sign of water in the oil last fall when I had to put the little C away; there was never a problem with indicating oil pressure or having to add excessive amounts of antifreeze, so I was a little puzzled. Not knowing the engine characteristics all that well, I'm wondering if prolonged setting in cold weather would cause any problems around the sleeves in the cylinders? Is it more likely I have a crack in the head and simply need to pull the head and have it reworked? Is there anyway to check to see if I can determine where the crack might be?

On another note, I had to overhaul the hydraulic cylinder because of the packing seal leaking. Got that accomplished, but am now wondering if all I have to do is fill the cylinder, fill the line, reinstall on the pump, and then refill the transmission/differential through the fill plug on the left side of the housing till oil runs out the hole? Is this the proper way to service transmission/rear end/power take-off and pump? I can't see any other place to add fluid to the pump.

Thanks for listening and helping out.

Dave

Thanks again fellas, I'll keep ya posted. Gotta have her ready for the spring planting season!