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Am trying to drop the lower unit to replace the impeller and other water pump parts.
'90 Evinrude 48SPL
The 5/8" center housing bolt in front of the cavitation plate is frozen. Actually, I have moved it a littel, but it is very tough going. Am worried about pushing too hard. The other four 9/16" bolts broke free easily.
Have been soaking in spray penetrant, but not sure how well that is getting in there even with the motor tilted full up.

Anything else I should be trying?

Previous owner said he's had no problems but said its been years since the impeller was replaced. Maybe this is why. I hope not.

Jim