I completely disassemble because its easier. "Gunk" between the cylinder liner and the engine housing doesn't get removed unless you remove the sleeve. You don't get really good access to the bearings to remove any remaining anti-freeze without pulling the crankshaft, and you have to pull the sleeve to pull the crankshaft.

Complete disassembly (without removing the bearings) takes about 10-15 minutes. I'd probably spend at least that much time trying to make sure I had all the anti-freeze out of the engine.

And w8ye - I agree that if you remove the bearings, replace them. But for a quick teardown and cleaning, there's no reason to remove the bearings unless they are suspect.

But then again, I usually don't even bother with the cleaning unless I'm changing the beaings anyway.

Brad