Water pump options to replace obsolete impeller

[sam60]

Re: Water pump options to replace obsolete impeller

Hate to drill holes in it, but what are the options for thru hull pumps? I haven't any injection molders to make 500 impellers in my network of friends.

 

[bruceb58]

Re: Water pump options to replace obsolete impeller

Basically same water pump used on Volvos.

 

[HT32BSX115]

Re: Water pump options to replace obsolete impeller

Yeah. I think your only solution might be an engine mounted pump and a thru-hull unless you can find an after market impeller that is close enough to fit.

Have you compared a "regular" Cobra impeller to your old one?

 

[bruceb58]

Re: Water pump options to replace obsolete impeller

I don't know if this is an option at all but I wonder if an engine mounted raw water pump could possibly draw through the existing path through the outdrive if you removed the drive's impeller. Would be interesting to find if anyone has done such a thing.

 

[Don S]

Re: Water pump options to replace obsolete impeller

It would be a bad idea to try and pull through the drive. The raw water pump would suck air because the drive pump is not designed to be air tight around the shaft. Any time the drive pump was above the water, the engine driven pump would suck air and no water.

 

[sam60]

Re: Water pump options to replace obsolete impeller

It would be a bad idea to try and pull through the drive. The raw water pump would suck air because the drive pump is not designed to be air tight around the shaft. Any time the drive pump was above the water, the engine driven pump would suck air and no water.

So if the inlet of the pump is above the draft it will not work drawing through the drive?

 

[Don S]

Re: Water pump options to replace obsolete impeller

So if the inlet of the pump is above the draft it will not work drawing through the drive?

Not the inlet, but any part of the pump being above the water will allow an engine mounted pump to suck air when trying to draw through a drive pump.

 

[soonerbred1969]

Re: Water pump options to replace obsolete impeller

If you do a thru-hull intake to a belt driven or crank driven raw water pump. Dont you risk burning up the drive without the water flow through it?

 

[Don S]

Re: Water pump options to replace obsolete impeller

What do you suggest as a solution Don?

A through hull fitting, like any inboard engine would use.

 

[soonerbred1969]

Re: Water pump options to replace obsolete impeller

A through hull fitting, like any inboard engine would use.

Sorry, you responded while I was editing my post.

So the impeller in the drive really isnt cooling the drive, its there just for water to the engine?

 

[soonerbred1969]

Re: Water pump options to replace obsolete impeller

A through hull fitting, like any inboard engine would use.

So its ok to run the engine without the water flow through the drive pump?

 

[bruceb58]

Re: Water pump options to replace obsolete impeller

So its ok to run the engine without the water flow through the drive pump?

Yes if the impeller is no longer in there(removed) which would be the case if you went to a thru hull setup.

 

[soonerbred1969]

Re: Water pump options to replace obsolete impeller

Yes if the impeller is no longer in there(removed) which would be the case if you went to a thru hull setup.

If you remove the impeller, how do you keep water from flooding into the boat?

Do you leave the hose connection to the drive and just plug it?

 

[sam60]

Re: Water pump options to replace obsolete impeller

If you remove the impeller, how do you keep water from flooding into the boat?

Do you leave the hose connection to the drive and just plug it?

I would bet that in his 44,000 + posts, Don S. has likely created a plumbing diagram for this situation exclusively for the KC drive. I will be using his wiring diagram and precise instructions for the Delco Voyager Distributor this weekend!

 

[Don S]

Re: Water pump options to replace obsolete impeller

You need to start your own thread soonerbred, not hijack this one with your questions.

 

[sam60]

Re: Water pump options to replace obsolete impeller

A through hull fitting, like any inboard engine would use.

What is the preferred location to install the fitting and what is the orientation of the inlet screen? Am I correct in assuming that you only need the inlet in the hull and it still discharges through the stern drive? THANKS!

 

[Don S]

Re: Water pump options to replace obsolete impeller

Normally a strainer through hull like the one pictured below, with a secock on it, and a strainer is used when installing through hull pickups.

 

[sam60]

Re: Water pump options to replace obsolete impeller

So, a thru-hull fitting it will be. I can fit this crank mounted pump in but just barely.Need to finish EST Voyager install first.

http://www.michiganmotorz.com/sherwood-hypro-water-pump-p-428.html

I hope that this work.

 

[sam60]

Re: Water pump options to replace obsolete impeller

Was setting the base timing on the distributor install and the engine seemed to be getting hot with the muffs and water on. When finished I pulled the impeller. Looks like I'll be needing the crank driven pump and hull fitting sooner than I hoped.

 

[soonerbred1969]

Re: Water pump options to replace obsolete impeller

You may have just found the culprit to the seized engine you started with.