Date
1 - 9 of 9
Impeller Change
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Andrew Massey
Finally got motivated to change the impeller on my Yanmar which I had been hesitating to do because of the location. All I can say is whomever designed this deserves a special place in hell. Getting the cover off wasn’t too bad but the lack of visibility and leverage that seemed to be mutually exclusive made a 10 minute job on previous boats into a multi hour ordeal with my arms battered looking like I had defensive wounds. The impeller had a couple arms missing and I replaced and used a Speedseal cover kit I had bought previously for the occasion which should make future changes easier (together with a good dousing of grease on the spline). Runs about cooler 5 deg with the improved flow and a potential problem averted |
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Tom Sokoloski
Andrew,
One item which might make the impeller change slightly easier is this: https://www.bayshoremarineengines.com/129671-92110yanmarimpellerbolt.aspx It seems overpriced for what it is, but it works very well. You might have to change the impeller you are using (some have internal threads, some don't). I've been using this for a number of years, after struggling with needle nosed pliers, bent screw drivers, and anything else I could think of. Hope this helps. -- Tom Soko Juniper #307 Noank, CT |
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Andrew Massey
Great tip. My spares from Yanmar
have the threaded side - too bad I just installed it thread side in. Next time…. Pardon my spelling - sent from my iPhone |
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Bret
I second Tom's suggestion. I used to struggle with pliers, etc, but once I went to this little gizmo - everything was easy. (Well, the "getting out" was easy - the putting the impeller back in is still tricky).
-- Bret JoyRide, #205 Bellevue, WA |
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Scotty <correa-mickel@...>
I also use this tool. It is worth every penny. On the JH3AE the pump is facing backwards, which makes the job really hard. I have thought that I might fabricate a press that bolts onto the pump to press the new impeller on.
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Steve B. Losik <sblmd1@...>
Use a an electrical tie wrap and compress the blades (make sure in correct orientation) then it slides into the pump easily as the tie wrap comes off. Steve 203 On Mon, Jun 28, 2021 at 10:46 AM Scotty <correa-mickel@...> wrote:
-- Steve B. Losik, M.D. NOTICE: The attached email and/or medical report(s) contain confidential and privileged information for the use of the designated recipient(s). If you are not the intended recipient, you are hereby notified that you have received these reports in error and that any review, disclosure, dissemination, distribution or copying of it or its contents is strictly prohibited and may be punishable by law. If you have received this email and/or medical reports in error, please destroy all enclosed copies. Thank you. |
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Andrew Massey
The tie wrap trick worked but was tricky because of the glycerin lube - it was impossible to get all vanes going the same direction but given the compression area by the inlet/outlet and rotation of the impeller I’m guessing they would all self correct to the correct orientation with every complete turn. Maybe more of an issue on pumps that have a constant inner circumference. In any case water flow is better and engine running about 5deg cooler (~170d)
Pardon my spelling - sent from my iPhone |
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Tom Sokoloski
Andrew and Steve,
The vanes definitely orient themselves correctly after one rotation. For grins one year I turned off the cooling water intake, installed a new impeller with the vales in all different directions, and left the pump cover off. I had a friend push in the stop button while pressing the start button. The engine turned over a few times (without starting), and I watched the vales all orient themselves correctly. Eureka! No more worrying about the vane direction. Glycerin and a zip tie are your friends!! :-) Tom -- Tom Soko Juniper #307 Noank, CT |
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Paul Larter
Hi All, In an attempt to make it just a bit easier to change the impeller,
I installed an inspection plate on Naia so I can get to it that way. Pictures
attached.
Regards
Paul
Naia Sydney 
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