About to change the water pump on a 70 HP 1987 Johnson. Managed to lossen the (4) bolts after heating and some pursuasion. This lower unit hasn't been looked at in some time! Looks like it was run in the salt. The driveshaft won't come apart and free itself so I can further drop the bottom end. What gives here guys? What can a person do to free the driveshaft, STUCK? Also does the drive shaft slip directly into the crankshaft? Thanks for any help on this matter!...........L