Re: How to change impeller on my Johnson outboard
A manual would be a real plus. There are some tricks. The main problem that could occur would be the lower unit bolts snapping off. This will almost be a guarantee if the motor was run in salt water. I would recommend soaking the boats in a penetrating oil before attempting to remove them. Also alternate loosening and tightening the bolts may prevent a snap off.
Don't go teling the guy false information man. "This will almost be a guarantee if the motor was run in saltwater", that's not true.
I have been working on only saltwater engines my entire life, I've never even seen an engine that has been run in anything besides saltwater and I have never had a lower unit bolt break.
I did a pump 2 years ago on a 2000 150hp Johnny, original water pump. The guy had no idea what he was doing and just never changed his pump in 7 years, motor used in saltwater only for 7 years and not maintained too well. Honestly I'm not sure how the impeller didn't break apart or how it still pumped enough water, but anyway that L/U came down no problem at all, after 7 years. No problem with bolts one bit.
In most cases the L/U has been down within the last 3-4 years for a pump, unless the person has no idea and runs it for 7, and in that case, still no problem.
It's not hard to do coyotehead, as mentioned get a manual and it will help you out a lot.