Need seawater pump for Hunter 42 Kohler 9.5 KW generator

[Jim_H42]

BBC - check out this thread:

P42 generator info

I have a 1991 H42 (hull #95) which has a 8kw generator (Model on the plate is 8CC063). I have no information on the diesel engine that drives this and I can't see any model number info on the engine. Does anyone know what engine drive these? (mine is a 3 cylinders) Thanks.

forums.sailboatowners.com

I also had Seawater pump issues. See if my engine looks like yours - if so I can tell you that I rebuilt the pump using a re-build kit from Yanmar. That may be the best approach if finding another drop in pump isn't feasable.

 

[BBC16385]

BBC - check out this thread:

P42 generator info

I have a 1991 H42 (hull #95) which has a 8kw generator (Model on the plate is 8CC063). I have no information on the diesel engine that drives this and I can't see any model number info on the engine. Does anyone know what engine drive these? (mine is a 3 cylinders) Thanks.

forums.sailboatowners.com

I also had Seawater pump issues. See if my engine looks like yours - if so I can tell you that I rebuilt the pump using a re-build kit from Yanmar. That may be the best approach if finding another drop in pump isn't feasable.

No, that's not mine. My P42 is hull 208, Sept. 1996 (1997 model year). Thanks anyway.

 

[BBC16385]

This is for you to check your Genset Serial numbers to make sure.

View attachment 214540

Best I can do to help you.
Jim...

PS: My Yanmar pump is the left image.

Jim:
Upon further review, I think you have hit the nail on the head. I am 99% certain that my replacement pump is the GM46936 and the impeller is 229826, which is a 12 blade impeller just like mine takes. I can't verify until Friday. The boat is 75 miles away. But I'm going down for the weekend and hopefully wrap this thing up. Thanks.

 

[JamesG161]

Just for your info...

Your boat and my H430 are all most identical on everything.
Like AC, Refrig, Tank Level Sensors, Instruments, in-mast furling etc.

Another H42 owner and I have chatted about this.

Remember we all trying to help.
Jim...

 

[eianm]

I have a 1997 Passage 42. It has a Kohler 9.5KW generator. Kohler Generator model # 3TNE78AC-KM . The seawater pump will not draw the water up after 26 years. Needs replacement. We cannot find one. No markings or numbers are on the pump.

Has anyone had to replace this part? How? What is it? Where can I find it?

If anyone has this generator, could you look at your water pump and take a picture of any markings or numbers?

Thanks.

i have impellors for that if you cant find them

 

[BBC16385]

This is the answer to the question of what is the raw water pump on the Kohler 9.5 kw generator:

My generator is the 1995 9EOZ. The current model number for the water pump installed on the 1997 Hunter P42 generator is GM46936. You can find it on the internet for about $200. I was going to install it myself but I've decided to have my shipyard do it because it's just too much for me. Thanks to all for your help.

 

[BBC16385]

A caveat to the above. Pump GM46936 is the pump installed on the Kohler but it has been replaced by newer versions. This is the actual current version for pump GM46936: #JPR-SE7107P JMP Marine Kohler Replacement Engine Cooling Pump (Replaces JPR-KL10IP2, Kohler 267373, 246489, 344089 / Sherwood G906P, G907P)

The pump was installed yesterday and it is working.

 

[Ralph Johnstone]

The pump was installed yesterday and it is working.

So how long do you think this pump is going to last? The full year ?

Did you ever stop to think that there's a bigger problem here ? Maybe it's the pump installation .......... or maybe it's just you ?

 

[BBC16385]

So how long do you think this pump is going to last? The full year ?

Did you ever stop to think that there's a bigger problem here ? Maybe it's the pump installation .......... or maybe it's just you ?

The pump removed yesterday lasted 25 years of heavy use. I have 3,500 generator hours. I think this new pump will also last 25 years, but I won't.

 

[Ralph Johnstone]

I don't follow. This is what you told us :

Here is a page from a Yamnar manual which shows you the recommended impellor replacement time :

Get a copy of your maintenance manual and I 'm sure the replacement time for your impellor is similar.

Something is wrong with your pump.

- the impellor does not have to be changed every year
- the impellor does not wear away the cam, the sidewall or the cover plate. The rubber impellor is soft, the metal is hard.
- the cam NEVER requires replacement unless something is VERY WRONG.
- the impellor does not fail to lift if has been replaced within the year.
- you do not replace the raw water pump at 3300 hrs. unless it has seen a major failure

Your raw water pump should be the last thing of concern on your engine. Do you have a fine screen in your raw water filter before the engine. Foreign material will wear away at your cam, sidewall and cover plate. The impellor doesn't.

The pump removed yesterday lasted 25 years of heavy use.

But you said the pump was replaced last year. There may be a misquote or two but I believe your problem(s) will continue to plague you next year as well.

 

[BBC16385]

We replace the impeller annually because when we have not (say two years) we are missing a blade or two and that's bad. The impeller does wear the cover, which we have reversed and replaced over the years. (You can see a round wear mark on the inside of the cover caused by the brass on the impeller.) It also wears to non replaceable inside wall. And replaced the cam once. We did these things because the pump was not pumping. Each one of these remedied the problem. The generator is about three feet above the water line, so a worn pump has trouble pulling up the water but a new or refurbished pump has no issues. The inside wall wear after 25 years is why this original pump stopped pumping.

We replaced the engine sea water pump for the same reasons two years ago. No more issues there either. Both pumps have strainers.

 

[Ralph Johnstone]

Just looking at your avitar now, I see (if I'm correct) your home port of Deltaville, Virginia. Looks like the kind of place I would want to get lost in and never be found again.

I take it the light coloured waves we are seeing is silt being washed out to the ocean by a nearby river. As beautiful as this is, I'm afraid this may be the cause of the erosion in your raw water pump. As I emphasized previously, soft rubber sliding over metal does not cause erosion. If you insert silt, which is ground rock that is so fine it stays suspended in water with the slightest amount of movement, you have an abrasive, and thus your erosion.

I'm afraid you're stuck with it. From the looks of it, replacing your pump internals every year or so is a small price to pay for such beauty.