[C320-list] Fwd: Impeller housing leak.

[Jeff Hare]

Hi Greg,

Thanks, that's what we found as well about 7 or 8 years ago. We had 2
problems, dripping and some difficulty re-priming after a strainer change.

The new seals were fairly easy to reinstall as I recall and solved the
leaking problem but not the priming.  That turned out to be wear on the back
plate and also on the opposite face of the pump body.  So, if you find that
you ever start having priming problems and the impeller is in good shape,
just consider a new pump.  

We did this and it pump water *so* much more forceful than the old pump and
instantly primes every time.  Was a great maintenance investment since I
believe it will be able to keep the engine cooler longer as the filter
becomes more restricted.  People who sail in water that has a lot of fine
sand or silt (or run aground in sand and stir up a lot of sediment trying to
back out) may be more likely experience early seal and pump body wear
failures.

-Jeff Hare
#809

-----Original Message-----
From: C320-list [mailto:c320-list-bounces at lists.catalina320.com] On Behalf
Of Jbrown5093
Sent: Thursday, July 21, 2016 3:52 PM
To: C320-List at Catalina320.com
Subject: Re: [C320-list] Fwd: Impeller housing leak.

Great information!  Thanks

Jim Brown

Sent from my iPhone

> On Jul 21, 2016, at 2:45 PM, Greg Flanagan <greg.flanagan at shaw.ca> wrote:
> 
> Thanks to all for your ideas. Here is the latest word on solving the
problem. 
> 
> I was informed that the hole in the housing is there for a reason and not
a failure. If it drips it is a warning that something more serious is
happening, or going to happen like bearing burnout. 
> 
> I removed the water pump (easy to do) and took it to the local service
company. They checked it out and found the seals were failing. The bearings
were ok. So with new seals  in place i will reinstall it this afternoon. It
also required a new impeller and a new belt, both worn past their best
before date. Some advice was to not have the belt too tight as this will
stress the bearing and other parts. Note the boat is 10 years old so the
pump has provided pretty good service as this is the first time it has shown
any problems. It is very expensive (at least here in BC) to replace this
(Johnson) pump from Yanmar.
> 
> Thanks,
> 
> Greg Flanagan
> Sidney, BC
> Hoop Dancer #1076
> 
>> On Jul 14, 2016, at 3:02 PM, Ken Geiger <kendgb at aol.com> wrote:
>> 
>> I do not know what the pump housing material is off hand, but one might
apply a magnet to it to determine if it is magnetic.  If not then one might
scrape back some paint and observe the colour of the material.  bronze is
yellow/gold and aluminum is silverish.  If Magnetic then Iron alloy.  
>> 
>> After a thorough cleaning, best done by bead blasting, one might attempt
having the hole fixed.
>> 
>> If the housing is bronze one might braze repair the hole or silver braze
(solder) it.  If Aluminium it could be welded up.  If cast iron then
brazing.  One might also try an epoxy repair with the likes of JB Weld. 
>> 
>> Of course for the brazing and welding you need the equipment, supplies
and know how.
>> 
>> Then when you do get a new pump,  this patched one becomes a good back
up.
>> 
>> FWIW
>> 
>> Ken
>> 
>> Northern Dream  #765
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> ---- Original Message ----
>> From: Greg Flanagan <greg.flanagan at shaw.ca>
>> To: C320-List <C320-List at Catalina320.com>
>> Sent: Thu, Jul 14, 2016 5:46 pm
>> Subject: Re: [C320-list] Fwd:  Impeller housing leak.
>> 
>> I don't know the composition of the metal. The leak is in the impeller
housing inlet hose pipe I called the bib. It appears as a pinhole with rust
around it (and salt) and drips water which then flows down the impeller
outlet hose at the bottom and drips on the floor. Not a great flow but adds
up with time running the engine and flows over the galley floor.
>> 
>> Thanks,
>> 
>> Greg Flanagan
>> 10460 Allbay Road
>> Sidney, BC V8L 2P3
>> 250 665-7245
>> 
>>> On Jul 14, 2016, at 2:39 PM, millers1 at aol.com wrote:
>>> 
>>> 
>>> Greg,   Is the leak in the cast bronze housing?  Does it manifest itself
as a weep/leak like a pin hole;e or porosity 
>>> in the casting??
>>> 
>>> 
>>> Several companies put out products to deal with casting porosity
problems.    One I remember is Loc-tite.
>>> You need to get the kit with the base material being bronze.
>>> 
>>> 
>>> Art   #680
>>> 
>>> 
>>> 
>>> -----Original Message-----
>>> From: Jeff Hare <Catalina at thehares.com>
>>> To: C320-List <C320-List at Catalina320.com>
>>> Sent: Thu, Jul 14, 2016 3:38 pm
>>> Subject: Re: [C320-list] Impeller housing leak.
>>> 
>>> Worth shopping around for.  We got a new water pump (3GM) through 
>>> Merri-Mar Yacht Basin in Newburyport, MA for $280.  Others on this 
>>> list (not local) have purchased one through him and had it shipped.
>>> 
>>> So, the prices may vary a lot, so worth looking around.
>>> 
>>> -Jeff
>>> 
>>> -----Original Message-----
>>> From: C320-list [mailto:c320-list-bounces at lists.catalina320.com] On 
>>> Behalf Of Greg Flanagan
>>> Sent: Thursday, July 14, 2016 11:42 AM
>>> To: C320-List at Catalina320.com
>>> Subject: [C320-list] Impeller housing leak.
>>> 
>>> RE: Yanmar 3YM30
>>> 
>>> It appears I have a leak in the impeller housing inlet hose bib. It 
>>> appears a rust hole has developed. At first I thought it was a leak 
>>> in the lower outlet hose (with pressure release valve) which 
>>> connects with the outlet side of the impeller. However, I replaced this
hose and the leak persisted.
>>> Upon close inspection I think it is above the hose connection in the 
>>> metal and just runs down the hose.
>>> 
>>> I tried to purchase a new impeller housing (it is a separate part) 
>>> but Yanmar does not sell it separately. This part is just one part 
>>> of the sea water-pump assembly and they want over $500 for it.
>>> 
>>> The questions: is it possible for this part to rust to the point of
leaking?
>>> If so can this hole be welded or repaired in some way? Does anyone 
>>> know if this part can be purchased separately? Is there a source for 
>>> good used parts?
>>> 
>>> Thanks,
>>> 
>>> Greg Flanagan
>>> Hoop Dancer #1076 (2006)
>>> Sidney, BC V8L 2P3
>>> 250 665-7245=
>>