Tip. Replace the impeller fasteners with screws which take a hex key. Much
easier to work with.
________________________________
From: dwight <[email protected]>
To: [email protected]
Sent: Sunday, March 23, 2014 12:21:29 PM
Subject: Re: Stus-List Impeller/gear puller
David
Hardest part is getting the cover off the pump; the nuts on those bolts are
hard to get at and you may have to use a knife edge to pry the cover free. I
haven’t changed an impellor in 5 or maybe 6 years but I carry spares. I
winterize my raw water system with 50/50 ethylene glycol water mix after haul
out in fall and so during storage my impellor is always surrounded by that mix.
When I winterize I disconnect the hose to the raw water thru hull at the pump
end (not the thru hull end) and connect another length of similar sized hose to
the pump which I use for winterizing and which after winterizing is complete
gets suspended above the engine full to almost the top with the 50/50 mix.
Come spring (soon I hope) I simply put that hose in a bucket of fresh water
that is continuously supplied while I start up and run the engine on the hard
and then before launch I remove that hose and reattach the hose to the raw
water thru hull…easy and works
great for me…I think it has been proven unnecessary to replace that impellor
every year…consider how long they last in outboard motors…in my view a new one
may be just as likely to fail because of faulty construction, I intend to go
another year on the one I have installed now…carrying the riaght spares and
tools is more important in my opinion because this job is not that hard to do
at sea…that said I probably will change someday soon…hard to decide when to fix
something that ain’t broke
________________________________
From:CnC-List [mailto:[email protected]] On Behalf Of David Knecht
Sent: March 23, 2014 12:40 PM
To: CnC CnC discussion list
Subject: Re: Stus-List Impeller/gear puller
Hi Chuck et al.- I have the M4-30. This is the first time I have had the water
pump apart so I have no idea when the impeller was last removed. I will
certainly keep it out for future winters, but I need to get it off to start the
process. I actually bought a new one that can run dry for some time, so that
should take care of the periodic starts with the intake closed. I will have a
try at the wiggle/twist and pull with the pliers, but I suspect it is not going
to come that way and I am worried about Dwight’s comment. I will see if the
yard will loan me a puller for this time. I don’t want to spend $50-100 on a
puller which should be needed only this time when I am not convinced any of
them will grab my impeller. Dave
On Mar 23, 2014, at 11:18 AM, Chuck S <[email protected]> wrote:
David,
Forget if you have the Universal M4-30 like me and Dwight? Many 34plusses were
built w Yanmar.
Here's what I do after getting much advice from this list over the years:
I pull the raw water pump impeller of my Sherwood every Fall and stow it with
the key in a sandwich bag to remind me to put it back in before starting the
engine in Spring. I remove the three screws w a box wrench and let the housing
hang by the hoses. I mark the housing w an arrow to show direction of
rotation. I usually can pull the impeller out with my fingers by turning it
slightly in the normal direction of rotation. You can wrap a rag around it to
protect your hands. If it is stuck, I take a pair of needle nosed pliers and
gently grab one of the splines near the hub and gently rotate and pull. I close
the housing for winter storage.
Come Spring, I usually install a new impellor or a spare and place last years
in my spare parts tupperware container. Before assembly, I open the pump
housing and coat the rubber splines and wearing surfaces with a waterproof
lube; lip baum sticks like Chap Stick work fine. Vaseline is a little messier.
This protects the rubber from destruction if I forget to open the intake valve
before starting the engine.
Chuck
________________________________
From: "David Knecht" <[email protected]>
To: "CnC CnC discussion list" <[email protected]>
Sent: Sunday, March 23, 2014 8:49:04 AM
Subject: Stus-List Impeller/gear puller
I need to change my impeller and after an earlier discussion and difficulty
removing the present one, I purchased an inexpensive gear puller to remove it.
I tried to use it yesterday and found that there was very little space between
the back of the impeller and the housing of the water pump, so I could not get
the arms of the puller to grab anything. The arms on the one I bought are
quite thick. Do I need a different tool? Thanks- Dave
David Knecht
Aries
1990 C&C 34+
New London, CT
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_______________________________________________
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David Knecht, Ph.D.
Professor and Head of Core Microscopy Facility
Department of Molecular and Cell Biology
U-3125
91 N. Eagleville Rd.
Universityof Connecticut
Storrs, CT 06269
860-486-2200
860-486-4331 (fax)
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[email protected]
_______________________________________________
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