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Go Back   SailNet Community > General Interest > General Discussion (sailing related) > Yanmar waterpump impeller
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Topic Review (Newest First)
03-09-2013 10:13 AM
smurphny
Re: Yanmar waterpump impeller

Quote:
Originally Posted by ImagineDP View Post
How difficult is it to change the salt-water pump on a Yanmar 3qm30? The pump is currently leaking some water from the weep hole and the pump is also making some noise. I am pretty handy but don't want to take on a project that is out of my league.
Very easy.
03-09-2013 08:57 AM
Seaduction
Re: Yanmar waterpump impeller

Quote:
Originally Posted by ImagineDP View Post
How difficult is it to change the salt-water pump on a Yanmar 3qm30? The pump is currently leaking some water from the weep hole and the pump is also making some noise. I am pretty handy but don't want to take on a project that is out of my league.
See Maine Sail's excellent website for advice and instructions on matters like these:
Rebuilding A Raw Water Pump Photo Gallery by Compass Marine at pbase.com
03-09-2013 07:48 AM
aa3jy
Re: Yanmar waterpump impeller

Quote:
Originally Posted by HUGOSALT View Post
Welcome back into the clan! Yes the sailing is the same with a few
gadgets and some additional rules and regulations added.
The time my impeller failed it was shortly after being installed at spring commissioning, unlike the usual vane coming off, the vanes
separated from the core. Looked like a perfectly good impeller
except the core was turning but not the vanes.
One of the tricks that I learned to insure the core of the impeller hasn't separated is to try to pull two vanes out from one another prior to installation. I've seen this happen even with new,in the bag, impellers.
03-09-2013 02:26 AM
celenoglu
Re: Yanmar waterpump impeller

The direction of the vanes is not important. nsert the new one in any direciton you want. They will change to their original direction when the impeller makes half a turn.
03-09-2013 01:35 AM
ImagineDP
Re: Yanmar waterpump impeller

How difficult is it to change the salt-water pump on a Yanmar 3qm30? The pump is currently leaking some water from the weep hole and the pump is also making some noise. I am pretty handy but don't want to take on a project that is out of my league.
02-12-2013 12:52 AM
Jgbrown
Re: Yanmar waterpump impeller

I just bought the bits for mine too, they sure are small compared to the normal ones I take apart on powerboats.
I got a nice discount, buying 2 sets of everything(air-filter, oil-filter, fuel filter, impeller and gasket). Worth replacing them all if it's been a while, then start the clock from there. My air filter looked ok at first, but the foam was so degraded it was getting sucked into the intake in small pieces.
The 2nd set I already sold to someone else, when they saw me starting they decided to do the same, otherwise it would have been spares.

While you're at it, I'd replace the o-rings in the sea-strainer at least, or possibly replace the whole thing, if it's like my ancient Vetus one(hard to get parts, all plastic).
02-10-2013 10:28 AM
HUGOSALT
Re: Yanmar waterpump impeller

Welcome back into the clan! Yes the sailing is the same with a few
gadgets and some additional rules and regulations added.
The time my impeller failed it was shortly after being installed at spring commissioning, unlike the usual vane coming off, the vanes
separated from the core. Looked like a perfectly good impeller
except the core was turning but not the vanes.
02-10-2013 09:06 AM
MSO sailor
Re: Yanmar waterpump impeller

Quote:
Originally Posted by HUGOSALT View Post
MSO you ask how many impellers you need, the answer
is just one...at a time.
You will be well served by keeping a spare on the boat, as these little buggers sometimes have a way of disintegrating at the most inopportune times!
Don't buy spare until you install and know the new one is correct
size as the GM engine series has several different water pumps with
different size impellers.
Assuming boat is new to you, so suggest that you might change
belts as well and keep old ones as spares.
Had both an impeller go and water pump belt break on same cruise
few years ago, with spares we didn't miss a beat and very
reassuring being self sufficient.
Thank you, this is very good advice1 I was planning on keeping the "old" impeller as a spare, there is nothing wrong with it, but i will feel alot better if I know its new, same with the belt. I do the same with my cars 7 keep the old belt & also wipers as a spare , I figure a old one is better then pushing!!lol
Thank you all very much, I'm new to sailing again after a 40 year absence.But i think its still the same.
MSO sailor
02-09-2013 07:03 PM
chef2sail
Re: Yanmar waterpump impeller

Good practice is to replace your impellar every year as part of your spring commisioning. Dont wait for it to explode into your heat exchanger.

Dave
02-09-2013 04:49 PM
HUGOSALT
Re: Yanmar waterpump impeller

MSO you ask how many impellers you need, the answer
is just one...at a time.
You will be well served by keeping a spare on the boat, as these little buggers sometimes have a way of disintegrating at the most inopportune times!
Don't buy spare until you install and know the new one is correct
size as the GM engine series has several different water pumps with
different size impellers.
Assuming boat is new to you, so suggest that you might change
belts as well and keep old ones as spares.
Had both an impeller go and water pump belt break on same cruise
few years ago, with spares we didn't miss a beat and very
reassuring being self sufficient.
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