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:cnc-list-boun...@cnc-list.com] 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 <cscheaf...@comcast.net> 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" <davidakne...@gmail.com> To: "CnC CnC discussion list" <CnC-List@cnc-list.com> 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 <pastedGraphic.tiff> _______________________________________________ This List is provided by the C&C Photo Album http://www.cncphotoalbum.com CnC-List@cnc-list.com _______________________________________________ This List is provided by the C&C Photo Album http://www.cncphotoalbum.com CnC-List@cnc-list.com David Knecht, Ph.D. Professor and Head of Core Microscopy Facility Department of Molecular and Cell Biology U-3125 91 N. Eagleville Rd. University of Connecticut Storrs, CT 06269 860-486-2200 860-486-4331 (fax)
_______________________________________________ This List is provided by the C&C Photo Album http://www.cncphotoalbum.com CnC-List@cnc-list.com
