[C38] Changed seawater pump impeller fail

Charles Finn Charles at finn.ws
Tue Mar 2 16:14:25 EST 2021

I seem to remember way back that the shaft that drives the impeller can 
become disengaged while changing the impeller.  A way to check is to see 
if you can spin the impellor by hand because if you can you know the 
problem.    If Tom Troncalli is still reading the listserve he could 
perhaps help.  The other option is to contact Universal....

I wish I could be more helpful, but this info was from a long time ago!!!!

There are a few youtube videos on this job.  One remarks about the need 
to align the pump shaft. https://www.youtube.com/watch?v=8B0x2yFFQF4

Good luck!

Chuck Finn
Mighty Quinn #114
Lake Superior

On 3/1/2021 11:55 PM, Pierre Patino wrote:
> OK. Now I'm in the completely perplexed phase.
> I removed the outlet hose from the raw sea water pump. I could blow 
> into the hose. Furthermore, I rigged a connector and was able to push 
> fresh water through the system with a garden hose. Water came out of 
> the boat's exhaust just fine.
> I hooked up another hose to the outlet of the raw sea water pump. I 
> placed the other end into a bucket. I started the engine and seawater 
> came out into the bucket. Plenty of it.
> Then I reconnected the outlet hose to the pump again. I started the 
> engine. Water and exhaust came out of the exhaust hole for a while and 
> then.... no more.
> So I'm now wondering how to proceed. Is it time to look up the specs 
> of the pump and get a pressure gauge? Am I missing something obvious?
> Sigh
> On Mon, Feb 8, 2021 at 6:43 PM Pierre Patino <pierre.patino at gmail.com 
> <mailto:pierre.patino at gmail.com>> wrote:
>     Hello All
>     As the subject implies, I failed to do this properly I believe. I
>     bought the replacement impeller parts and removed the old one.
>     Removing the old impeller was easy. I cleaned the cavity (there
>     was some salt buildup, my fault for waiting too long)  and when I
>     proceeded to put the new impeller (looks exactly like the old
>     one), I was unable to put the snap ring back. I'm not sure how
>     important this is. In any case, I put the cover on with the new
>     o-ring and started the engine.
>     Now I notice zero water coming out the exhaust. I feel something's
>     buggered up and I'm not quite sure what the fastest way to
>     troubleshoot is. Suggestions?
>     By the way, the intake valve is open so I know it's not /*that
>     */operator error.
>     I've made sure the impeller spins by running the engine and
>     checking that the shaft has rotated as well as the impeller
>     (taking the cover off and putting it back on).
>     Just before I started on this project, water did come out of the
>     exhaust so I know it "used" to work.
>     I'm perplexed why I'm having such a hard time with the snap ring.
>     I just did not want to try jam it in with excessive force. The
>     last time I did this I had no trouble. Maybe I need to get yet
>     another impeller kit?
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