stuck impeller shaft

[mad mechanic]

1985 merc 50hp water pump impeller shaft stuck in crankshaft wont allow me to remove foot so i can replace water pump. was told that through process of electrolisis shaft has "welded" itself to the crankshaft-boat has also been in salt water for 2 years. was told to replace impeller every season whether it was needed or not, which i did, but shaft got stuck anyway!! im told that this cannot be fixed and when impeller fails it will render the motor useless i am a mechanic myself and dont see any way to fix this without tearing somthing up!! there has got to be a way to fix this!! HELP!!!!!!

 

[Franki]

Re: stuck impeller shaft

I take it you had no luck with the suggestions in your previous post?<br /><br />There is no "magic" cure for this.. I just went through the same thing with a heap of bolts I was trying to get out.. and I just had to persevere and be patient.<br /><br />I soaked in penetrating oil, used a soft hammer alot and tried many other things..<br /><br />in the end I got them all, but I had to do two with a drill.<br /><br />in your case, its going to be harder because you can't even get to the stuck parts..<br /><br />I would try upbolting the powerhead and see if you can't get it out that way... (chain the leg down somehow, and use a block and tackle though the lift lug on the moter to apply some seperation force consistantly..<br /><br />then use some of the methods suggested in your other post.. (tapping, heat ect.. your "electrolysis" problem shouldn't be that bad as both the shaft and the crank are both hard metals, you usually get alot worse when one is hard and the other soft.<br /><br />I was hoping for a magic cureall when I had my problem as well, but it didn't happen.<br /><br />rgds<br /><br />Frank

 

[alcan]

Re: stuck impeller shaft

Hello Mad<br /> Do a search on this board to Jan. 13 02 titled, help I'am screaming at lower unit.<br />I think all the tricks I know of and a few more are outlined there. Don't give up too soon. Good luck and keep us posted.

 

[novacane]

Re: stuck impeller shaft

use antiseize on the nexted one where they meet

 

[Allan19603hp]

Re: stuck impeller shaft

Hello, I need to re read your post... BUT is the shaft and impeller actually froze together...??? or is the driveshaft and the powerhead froze together.... Let me know as i have a solution to 1 of these problems....<br /><br />Allan

 

[G DANE]

Re: stuck impeller shaft

Hi Mechanic<br /><br />Dont give up - read this post http://www.iboats.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic&f=17&t=006363 Schematic gives a real good idea there !!