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Yanmar 75HP 4JH3-TE Salt Water Pump Replacement?
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Chris Paul
Here is a photo of my salt water pump. There is slight rippling (see my wavy line) around the outside surface. Also the metal across the ends of the inlet & outlet has broken (see red circles) & is sharp enough to damage the impeller. My mechanic says this pump is near the end of its life and is in a difficult location to change the impeller. My mechanic has given me 2 recommendations: either replace with a new mechanical pump or install an electrical pump that could be installed in an easier to service location. To me the electrical pump seems the better option (easier to service & cheaper) but is it durable?? I am not sure what to do and any advice anyone could give me would be much appreciated.  Regards, Chris Paul SM2000 GLAZIG #352 Whangarei, NZ |
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There are two issues to consider:
Can you measure the input and output hose connections on the current pump for me? I thought they were 25mm, but want to make sure. Bill
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Michael Winand
If you decide on the electric pump, I would like to have a spare, so you would buy 2. Make sure it's self priming. Some will let the water pass out of the circuit and need to be able to prime themselves. My new generator has a electric pump, it would lose the water when were under way,I fitted a mechanical pump as well, this solved the problem. Hope this helps Michael Nebo sm251
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Chris Paul
Hi to Michael & Bill, Thank you for your replies. Bill, the diameter for the hose connections is 26mm on the straight bit & 27.2mm on the lip at the end (for 1" = 25.4mm hose). I have decided to buy a genuine Yanmar pump. Luckily one is available in NZ - fast delivery. I'm not sure if it is worth keeping the old pump as a spare. Regards, Chris Paul
On Thursday, 2 March 2023 at 12:10:19 pm NZDT, Michael Winand <mickwinand@...> wrote:
If you decide on the electric pump, I would like to have a spare, so you would buy 2. Make sure it's self priming. Some will let the water pass out of the circuit and need to be able to prime themselves. My new generator has a electric pump, it would lose the water when were under way,I fitted a mechanical pump as well, this solved the problem. Hope this helps Michael Nebo sm251
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