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Old 12-20-2016, 11:33 PM   #1
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Leaking Raw Water Pump

Hi All,

I notice a small drip, but continuous drip from my starboard side raw water pump. Does the dripping mean I have to replace the impeller, pump or both?

Thanks
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Old 12-20-2016, 11:52 PM   #2
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You need to rebuild the pump and put new seals in it.
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Old 12-20-2016, 11:53 PM   #3
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Hi, survive a few rubber part of the exchange and the like. For example, Sherwood pump, find the corresponding pump to your web.




Pump Major Repair Kits from sherwood


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Old 12-21-2016, 12:00 AM   #4
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Do you recommend to change out the impeller at the same time? Should I do both star and port at the same time or wait to it starts to leak too?
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Old 12-21-2016, 12:08 AM   #5
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And how made rebuilt exaples


Rebuilding A Raw Water Pump Photo Gallery by Compass Marine How To at pbase.com
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Old 12-21-2016, 12:11 AM   #6
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And last i look yours pumps are Jabsco, jabsco raw water parts


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Old 12-21-2016, 12:14 AM   #7
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Great! Thank you
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Old 12-21-2016, 12:29 AM   #8
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When the seal goes bad, many times it means the bearing is becoming worn. If you just change the seal, make sure the shaft is tight in its' rotation. A worn bearing will just ruin the new seal and maybe scar the shaft.
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Old 12-21-2016, 12:36 AM   #9
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Do you recommend to change out the impeller at the same time? Should I do both star and port at the same time or wait to it starts to leak too?
If you do a lot of cruising in out of the way places, I'd replace both pumps with new ones and rebuild one old pump to keep aboard as a spare.

Otherwise rebuild both pumps. A rebuild would include new impellers, seals, gaskets, cams and covers.

Take a look at the condition of the shafts after disassembly.

If they are well worn I'd just buy replacement pumps and again try to rebuild one as a spare.
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Old 12-21-2016, 05:25 AM   #10
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Assuming the pump is Jabsco, they are normally common and cost effective to buy new vs having an outside shop rebuild. I use the 60% rule - if the rebuild cost is more than 60% cost of new, buy new.

Also, I change out my Jabsco impellers after 18 to 24 months. The old ones come out looking pretty good. Never run to destruction, mine are pretty cheap vs a failure. Some +300 hour a year guys change them out annually.
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Old 12-21-2016, 08:19 AM   #11
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Absolutely

"If you do a lot of cruising in out of the way places, I'd replace both pumps with new ones and rebuild one old pump to keep aboard as a spare."
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Old 12-21-2016, 11:52 AM   #12
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Many have advised to "rebuild the pump". That's fine if you know how to do things like this and have the tools and equipment to do it. Some do, some do not.

The parts to rebuild the pump are not free and there is some risk of failure, either immediate or long term, if you don't do an expert job.

My point is, for some folks, replacing the pump with a new on may be the best choice. It should take under an hour.


BTW: The leak is not a sign of a worn impeller. It's a seal and possibly failed bearings and a scored shaft. Having a spare pump on board is not a bad idea provided you also carry the tools necessary to replace the pump and have the mechanical skills to do it.
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Old 12-21-2016, 12:25 PM   #13
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Many have advised to "rebuild the pump". That's fine if you know how to do things like this and have the tools and equipment to do it. Some do, some do not.

The parts to rebuild the pump are not free and there is some risk of failure, either immediate or long term, if you don't do an expert job.

My point is, for some folks, replacing the pump with a new on may be the best choice. It should take under an hour.


BTW: The leak is not a sign of a worn impeller. It's a seal and possibly failed bearings and a scored shaft. Having a spare pump on board is not a bad idea provided you also carry the tools necessary to replace the pump and have the mechanical skills to do it.
Agree and if you cant rebuild or change out a pump due to a lack of mechanical skill you best learn or reconsider traveling to far places where there may not be adequate help. Most far traveled boaters particularly power boaters are mechanical jacks of all trades related to a complicated motorized home on the water. I personally would probably hire a mechanic even though I probably could do it but might get into trouble. Now if I saw a video or helped a mechanic do it once then no problem.
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Old 12-21-2016, 12:34 PM   #14
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Leaking Raw Water Pump

Quote:
Originally Posted by Capt.Bill11 View Post
If you do a lot of cruising in out of the way places, I'd replace both pumps with new ones and rebuild one old pump to keep aboard as a spare.

Otherwise rebuild both pumps. A rebuild would include new impellers, seals, gaskets, cams and covers.

Take a look at the condition of the shafts after disassembly.

If they are well worn I'd just buy replacement pumps and again try to rebuild one as a spare.

I have never rebuilt a pump before. While I am inherently lazy, I can usually figure things out pretty well if pressed. If it was me, I would go with Capt Bill's advice and at least buy one new pump to replace the leaking one and then try to rebuild the leaking one.

As for replacing both, I would only do that if I felt that the other was about to fail. (psychic am I) However, depending on your cruising grounds, having a new spare on the boat might not be a bad idea.

I used to replace the impeller yearly on my sailboat. The impeller was inexpensive and easy to replace. Since I am cheap as well as lazy, I doubt that I will be replacing the impellers on Kinship yearly. Overkill is one thing, throwing money away is something else.
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Old 12-21-2016, 12:42 PM   #15
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............I used to replace the impeller yearly on my sailboat. The impeller was inexpensive and easy to replace. Since I am cheap as well as lazy, I doubt that I will be replacing the impellers on Kinship yearly. Overkill is one thing, throwing money away is something else.
Your engine manufacturer will have a maintenance schedule that will dictate how often the impeller should be replaced. I would stick with that.

You might be fine going longer or your impeller might fail and small pieces of rubber end up stuck in the heat exchanger. Your choice. No guarantees either way.
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Old 12-21-2016, 12:57 PM   #16
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I have rebuilt water pumps several times and also had them reuilt preofesionally. They have never lasted as long as a new pump. I would take the leaking pump one off, keep it as an emergency spare and install a new one.

As far as impellors go, we change ours annually on my schedule. It's hard to predict when they will go and I'd rather do it on my schedule, at the dock, with a cool engine room and resources available in case I screw something up.
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Old 12-21-2016, 01:05 PM   #17
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Your engine manufacturer will have a maintenance schedule that will dictate how often the impeller should be replaced. I would stick with that.

You might be fine going longer or your impeller might fail and small pieces of rubber end up stuck in the heat exchanger. Your choice. No guarantees either way.

I can't recall at the moment what the recommended replacement interval is. I have looked at it before but can't recall. I just looked it up and Sherwood recommends replacing the impeller every year, so I guess I will continue to do that.
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Old 12-21-2016, 01:15 PM   #18
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I have rebuilt many engines, etc, with good success. But my success rate at rebuilding water pumps with mechanical seals is POOR. Not easy to do right unless you have the right tools and a press and knowledge of how they work.

These pumps are one thing I like buying new.
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Old 12-21-2016, 01:53 PM   #19
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Strongly advise keeping your pump as emergency spare (whatever that means!) and buying new from Seamax. These are a much better design than Sherwood and less expensive.
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Old 12-21-2016, 03:05 PM   #20
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Strongly advise keeping your pump as emergency spare (whatever that means!) and buying new from Seamax. These are a much better design than Sherwood and less expensive.

Yes, that is something that I plan on doing when it is time to replace the pump as it is a bolt on replacement.
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