I've had pretty good luck with running a full crankcase of cheap 30 weight oil and a 2 or 3 quart overfill with kerosene or Diesel fuel. That lets the crank and rods whip down into the sump at a fast idle and splash the oil/solvent mix around like the agitator in a washing machine. As long as you don't drive the vehicle or load the engine in some other way, there won't be any bearing damage. That procedure will clean the bottom end better than any kind of scrubbing you can do with the oil pan off. Drain the oil while it's hot, and most of the crud will come with it. Then you can repair any gasket or seal leaks the solvent wash might have created. I've had very good success cleaning gunked-up engines that way, even freeing up stuck piston rings at times.
Jerry


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!