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Old 31-05-2012, 15:45   #16
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Re: double / piggyback circulation pump?

You might take a look at; Johnson Data Sheets


and also; http://www.depcopump.com/datasheets/...10-24124-1.pdf


Unless you have a water lift muffler it would not matter how much water goes out the exhaust with in reason. If you have a water lift muffler you could either hook a diverter valve to your throttle linkage and dump it over the side or get a electronic speed control also hooked to your throttle. Just my two cents worth, Mike.

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Old 27-09-2012, 08:00   #17
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Re: double / piggyback circulation pump?

HI There, I have a double pump om my MD17C, it is made by Sen Dure in the USA, I have been having issues with mine as the raw water seems to pull the fresh water through the seals thus after 10 min or so running it drains my fresh water coolant. I have replaced the seals several times but cant get it to stop!
The only thing i can think of is that there are some tiny scores in the pump drive shaft that are letting the water through
Sen Dure have non returned my requests for parts etc
So I was at sea crossing the pacific when this problem came along and in the end I converted the engine back to raw water thus making both outlets run a positive feed to the engine and it has worked fine
Only problem now is to convert it back - I am currently using an electric pump for the fresh water but I wish i didnt have to
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Old 27-09-2012, 08:10   #18
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Re: double / piggyback circulation pump?

Greetings and welcome aboard the CF, butterflydundle.
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Old 27-09-2012, 08:52   #19
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Re: double / piggyback circulation pump?

Here is an electrical pump that might meet your needs for the coolant circulation.

Jabsco 59520 Circulation Pump
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Old 27-09-2012, 19:43   #20
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Re: double / piggyback circulation pump?

It would be better to stick with the original design concept of the double mechanical pumping arrangement. These pumps being driven from the same shaft need to be the same size as any differences in the output pressures will adversley effect the other, hence the loss of one fluid in "Butterflydundles" case via the shaft sealing arrangements. If the replacement is now a redundant spare there will be plenty of small engineering shops that can make up a shaft for you. This would be in a high carbon steel, hardened and ground to final sizing and or chromed and ground to final sizing.

Acushla
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Old 30-09-2012, 08:06   #21
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Talking Re: double / piggyback circulation pump?

Thanks to all for the positive suggestions!
I finally realized the real problem is not wearing of the seals themselves, so much as the seals wearing nice little grooves in the shaft, so even new seals don't stay leak free for long. I took the shaft to a local machine shop, and they sent it out to be chromed and re-ground to specs. Looks nice, and they assure me it will resist grooving far better than the original stainless shaft.
Time will tell .......... I will put it into service next spring.
Oh, by the way, the chroming and grinding charge was $210, so, not a cheap solution. ( but then, we all know that "cheap solution" and "boat" do not belong in the same sentence!)
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