Help changing impeller

[Mulf]

Not sure if this available for all engines but...

an impeller is now available for my 4jh3e Yanmar (Johnson Pump I think) that has a threaded section on one end of the impeller. There is a very simple puller available that has a bolt that sits on the hub and an outer nut that screws in the threaded end. Just turn the bolt with a wrench and the impeller is pulled out. None of the efforts described in this thread that could result in damage to the housing.

 

[Tally Ho]

And when ya put the new impeller in use some waterproof grease to make it not stick next time..
http://www.harborfreight.com/catalogsearch/result?q=superlube
A little of that stuff on the inside of the pump case and it will help get it primed .

Thanks Kloudie...that is what I used in my head pump, and used some in my impeller housing.

Good stuff.

 

[Sam Salter]

I have a 2GM20F with a raw water pump like yours.
I remove my impeller every winter when I winterize the boat - Canada/-30 in January!
I don't have any problem getting out the impeller, so I suspect it's either the salt water (I'm in fresh) or the PO hadn't changed it in a long time.
I suspect if you do it regularly from now on, a pair of long nosed pliers will be all that's needed.
Sam