Do they sell pumps that dont leak around the main seal?

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matt_unique

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Jul 16, 2014
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Do they sell pumps that don't leak around the main seal?

I'm striking out with brand new Honda pumps. First pump leaked from the main pump seal, fixed at dealership twice, and still leaked. They gave me another pump and at full power it leaks at that same main seal holding both sides of the water pump. These are brand new pumps...9840 GPH. This 2nd pump leaks less than the first but I need it for this weekend...crazy.
 

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Never heard of such goings on with a Honda before like that. Production problem ,as with everything built now, faulty seal batch, not like a Honda. Extreme backpressure quickly could blow a seal-what are you feeding with it?How large/long a hose? Indeed not the norm-lots of luck-John
 

2" hose fittings on pump, connected to 2" rigid suction hose, 2" rigid discharge hose, and 2" Keene dredge nozzle. Dredge nozzle reduces to 1.5 or 1.25" as I recall.
 

You could try using some gasket-making goop, or could buy some automotive, cut-to-fit gasket material and try that - the aluminum-sided stuff.

I'd run those ideas past your dealer first as I don't know what that might do to your warranty. If possible, take video of your setup and using the pump. That way the dealer can see exactly what's going n and how bad the leak is.
 

I'm assuming that your priming the pump before starting?
 

What Jog said.
 

Look inside the dredge nozzle down the water uptake end. Sounds like a rock or? blocking the restrictor in it OR made with wrong reducer and needs to be opened up. Run the pump without the nozzle into 2 pools/barrels whatever to see if that is cause of your dilemma-lotza luck-John
 

Water would not flow without primed pump.....brand new never used Keene dredge nozzle with no blockage. 2" nozzle with 1.25" reduction (measured it). Pump does not leak if running with no dredge nozzle attached.
 

I think there is some form of pilot error. Video would be easier than 20 questions

ratled
 

A few thoughts, and they may be all wrong... Is this a water transfer pump? A pump that isn't made to deal with much pressure, but basically made to move water from
Here to There?

If that is the case, choking from 2" down to 1.25", that's a cross sectional area from 3.14 square inches down to 1.22 square inches.. a 60% reduction..
Like sticking a banana up your tail pipe. Is this creating pressures in the pump that the seals were never designed to handle?
 

matt_unique said:
Water would not flow without primed pump.....brand new never used Keene dredge nozzle with no blockage. 2" nozzle with 1.25" reduction (measured it). Pump does not leak if running with no dredge nozzle attached.
Click to expand...

You missed the point on both of their comments.

For what Jog said, what he was getting at is that running the pump without water will damage the seals.
If you are trying to get it to go without priming then that would lead to seal failure, starting it up for whatever reason while not pumping water will also cause the seals to fair.

For what John said, Your reducer inside the nozzle could be too small for the pressure and needs to be larger.

It was also said that these small transfer pumps are not made to handle the pressure that hooking up to a nozzle causes.


Just tryin to help figure the problems out.
 

NOT LIKELY BUT could the orfice inside of the nozzle have been messed up and to small? maybe theres something blocking this orfice?? sounds like theres to much backpressure on that pump seal. it might pay to look inside the nozzle and / or measure that orfice...........
 

Start by showing us a picture of the pump you are talking about. If it's the one I found by googling "honda water pump 9840 GPH" Then there's your problem. The one I find is a trash pump. Never designed for dredging use or back-pressure like you are creating. It was meant to pump water through an unrestricted hose from point A to point B.
 

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Tep. That's why the high pressure pumps cost a bit more.

It's kinda like trying to use a 1500 lb. winch with "extreme" gear reduction to pull a 5-ton weight. The winch, itself, just can't handle it. Probably not the cable, either.
 

matt_unique said:
What about this one?
Honda WH20 Model Info | 2" High Pressure Water Pump | Honda Pumps

Of course, the weight is creeping up higher than I wanted @60 lbs dry.
Click to expand...

No difference I see. Yes, it weighs a lot more than a true high pressure centrifugal pump. Will your pump work for what you intend? Possibly, but you have to pay the trade-off which is more weight, 1/3 of the working pressure and less volume. I know some guys use that style of pump for small highbanker/dredge units, so if you can find one that doesn't leak, I guess you could be good to go. What size dredge are you trying to run with it?
 

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What exactly is it you're needing? If you're needing to transfer water to a 1.25" port and don't need much pressure, then don't go with a high $$, high pressure pump. If you DO need high pressure, how high do you need it?? Do you want to be in the 60PSI range? Maybe 80PSI? More??

It "sounds" to me like you're looking for a compromise - something to feed a suction nozzle and then transport that material to your dredge. Do I understand this correctly?

What about going to a 1.5" pump? There's the Honda WX15 - 72 GPM, 54PSI and 20 lbs. Next would be the Honda WH15XK1 - 115 GPM, 55PSI & 49 lbs.
 

kcm said:
What exactly is it you're needing?
Click to expand...

Thats the problem, he doesn't know what he needs. He's new to this and trying to DIY his first unit. BTW - that's a common scenario, but he is learning first hand why so many of us recommend buying a good condition, used setup instead of trying to homebuild your FIRST unit.

There is a actually a lot of complex (to me) hydraulic calculations that go into the designs of the commercially made units. Venturi pumps require a combination of BOTH pressure AND volume to function properly. Just like the reduction on the nozzle venturi is there for it's purpose, the design of the pump is for a reason.
 

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