Yanmar 4JH2 Impeller change - SailNet Community

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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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Old 07-08-2013
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Yanmar 4JH2 Impeller change

What was Yanmar thinking when they mounted the sea water pump facing away?

Ant tips to pulling the old impeller out? Would one of the "pullers" be a good idea? With the 3GM30 I just pulled the pump off to change the impeller, that doesn't look to be an easy option with the 4JH2. (Still gotta dig out the service manual).

Thanks in advance.
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Old 07-08-2013
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Re: Yanmar 4JH2 Impeller change

I used speed seals, which gets rid of some of the aggravation, and then a small mirror - everything is reverse, but once you get used to it, not too bad...else remove the pump and do it in my lap, it is a pain, but that way you are unscarred.....and know for sure you have removed any pieces or parts that you may miss with the mirror/feel method.

imagine doing this in a storm or ruckus...

perhaps your Crealock allows the steps to be secured....the hunter you just set them aside and hope the 75 pounds stays put or else you do it laying across the engine through the engine "room" door. But then you HAVE to do it left handed as you don't have enough room to bring your right under you to do it right handed.

On my P42 I have about 14" clearance to lay between the engine and the shelf that holds the gennie and the fridge unit and such...minus about 4" for the fire control nozzle that usually stabs me in the back at least once.

Best of luck.
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Old 07-08-2013
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Re: Yanmar 4JH2 Impeller change

I was wondering about removing the pump but with it being gear driven was thinking that might be a bit involved.

Guess its a normal boat project...working upside down, left handed with only one eye and in the dark.
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