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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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Diesel This is a forum dedicated to diesel engines and their applicable accessories.


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  #11  
Old 05-09-2014
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Old 05-09-2014
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Re: How often to change impeller?

I just recently found that my manual says to replace it every 6/yrs or 1000 hours. Mine is currently 13 years and 800 hours, so I'm considering it!
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Old 05-09-2014
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Re: How often to change impeller?

I still wonder why Yanmar has made it so difficult to change something that should be an annual maintenance item. On my 4jh I have to remove the water pump and alternator.

I watched some whiz at a boatyard change it by hand one time, without removing anything, but he was able to twist his hands into godawful positions...plus he was a Yanmar mechanic and did it all the time and could do it blind. I tried that a time or two and always dropped screws or the plate and realized it was easier just to remove the alternator and then the water pump.

Still cuss Yanmar for putting it where it is...on the backside of the water pump. Last one I saw at the boat show was the same way.
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Re: How often to change impeller?

We only put about 50 hours a year on the motor too, but change the impeller every year. As others have said, once you open it up to inspect it, you might as well replace it. This year i found a broken vane (in the heat exchanger), so I am glad we did it.

But this year I have also not been able to get the thing to stop leaking out of the cover since i replaced it last week. Motor is a Westerbeke 20B30. The gasket is just a thin paper gasket. i cleaned both surfaces and used a new gasket, but it still leaks badly.

I wonder if anyone has any tips or tricks to making the gasket seal? Or anyone know if someone makes a thicker (cork or rubber) gasket option? is it nuts to consider a little blue rtv?

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Re: How often to change impeller?

I think it has been six years since I've changed mine. If I remember correctly I have to jack up the motor and remove a motor mount to get to it. Brilliant design.
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How often to change impeller?

Every year is a good idea beside breaking apart they can take a set and lose enough efficiency to allow they engine to overheat as happened once to me

I use Globe long life impellers that are good for three years
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Re: How often to change impeller?

I have the Yanmar guy do mine aprox every year. I cant do it myself as its the 4JH3e... By the way they have changed the impeller housing to now be towards the front.

Anyway, so it take sa fully skilled YANMAR mechanic half a friggin hour to change the impeller... And a few times they have pulled ones out with blades broken.... But on careful inspection they were damaged by the screwdriver ripping them out.

Oh, and btw, Maine Sail (its not often I disagree with you) but their aint no impeller for $20! Try double that.


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Old 05-11-2014
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Re: How often to change impeller?

Quote:
Originally Posted by MarkofSeaLife View Post
I have the Yanmar guy do mine aprox every year. I cant do it myself as its the 4JH3e... By the way they have changed the impeller housing to now be towards the front.

Anyway, so it take sa fully skilled YANMAR mechanic half a friggin hour to change the impeller... And a few times they have pulled ones out with blades broken.... But on careful inspection they were damaged by the screwdriver ripping them out.

Oh, and btw, Maine Sail (its not often I disagree with you) but their aint no impeller for $20! Try double that.


Mark

Here's mine and it fits many other Westerbeke & Yanmar engines too.. Yanmar does not make the pump and many of them are Johnson. I can't recall the last time I installed a Yanmar "branded" impeller in a Yanmar cause I find it from the actual pump maker for significantly less...

One of the Cummins motors I work on has an impeller that is over $100.00 from Cummins. I buy the identical impeller for about $30.00 without the Cummins box..

http://www.marinepartssource.com/new...fgno=09-810B-1
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Last edited by Maine Sail; 05-11-2014 at 12:17 AM.
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Re: How often to change impeller?

That price in the link is great!!


I buy the Jabsco ones normally. I, too have never seen a Yanmar brand impeller.
But I sure need a Yanmar guy to get the damn thing in!

Actually, the half hour it takes the mechanic is fine because I get them to use the other half hour giving the engine a cuddle. A good pro inspection every 12 to 18 months is worth it to a mechanical dill like me
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Last edited by MarkofSeaLife; 05-11-2014 at 10:21 AM. Reason: Typo
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Re: How often to change impeller?

It constantly amazes me that such a critical engine system is soooo dependent on a little rubber part that is prone to unexpected failure. I always thought that there should be a water pump alternative with all bronze / stainless parts. If there was one I'd pay several time the cost OS a standard pump.
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