Home built water jet pack on Berkeley 12jg, packing cooling question
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Home built water jet pack on Berkeley 12jg, packing cooling question

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    Member rick1964's Avatar
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    Default Home built water jet pack on Berkeley 12jg, packing cooling question

    I'm the guy that's been running my homebuilt water jet pack off my Berkeley. In the beginning of the testing stages this summer the first few hours we had no problems with air or seizure, just a matter of time, finally had a small seizure. I've been using the standard berk white ropes. Should I use graphite? Which is the best. Since I'm using the pump in a static mode, of course I'm battling the packings overheating, I over heated them this last weekend, may need to replace the shaft again because Its getting harder to keep air out. I know this is brutal on that packing gland. If I keep them loose then we suck air in, at least I think that's where the air must be coming from. Not so good when I'm 20 feet up in the air and enough air enters the pump. Some time ago I read somewhere online of someone running a water tap off of the high pressure engine cooling line at the pump, and feeding water into the packings via a drilled hole into the packing housing. I would think one would want to have a sand/debris trap tho. Seems to me this might work somewhat especially if I keep the packings loose...? Make a hole in the packing down to the shaft might lube and replace the air with water too. I'm in a pickle here trying to make this work. This is a very interesting challenge. Like Tom at Jet Boat Performance said, I'm in uncharted territory. I'd sure like to find a way to beat this. We never turn more than 2000 rpm's. I've heard of those cartridge seals, but dont' have the funds for a new shaft just yet, maybe after tax time! And my packing housing bore has a bit of pitting so I may have problems with the outer cartridge o-ring seals. I had thought about using silicone to seal the cartridge in against the pitting. I've also read that the shaft/o-ring interface are sensitive to dirt and grime. I'd love to hear your ideas, or tell me if you think I'm crazy lol.
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    Last edited by rick1964; 10-23-2014 at 08:55 PM.

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    Senior Member DuaneHTP's Avatar
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    Check your PM's.

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    Default seal

    Check with John Crane. Look for a mechanical seal, made of ceramic. Not cheep, but will work for you for sure.
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    Senior Member Hass828's Avatar
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    These pumps are/were used for irrigation pumps. How do the seals live in that application?
    Last edited by Hass828; 10-15-2014 at 04:49 AM.
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    LP-25.com Infomaniac's Avatar
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    Duane has a nice mechanical seal. We run one.
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    B1 Racing cs19's Avatar
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    Try some lip seals, easliy done. Worth a shot.

    Thats a cool setup. I need one.
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    I think what ever you end up with, it will require seal water in the packing and a latern ring . Typically taken from the perssure side of the system.
    Last edited by schick; 10-16-2014 at 10:55 AM.
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    Member rick1964's Avatar
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    Quote Originally Posted by Infomaniac View Post
    Duane has a nice mechanical seal. We run one.
    What kind of maintenance do they require? I am going to need a new shaft with that kind of seal right? Does the shaft/seal interface need any maintenance? What kind of life expectancy do those have? I'll post pictures of the pitting that the bore has which might shoot this whole mechanical seal down. I think I could use some kind of sealant during installation to seal the outer o-rings against the pitting...?
    Last edited by rick1964; 10-16-2014 at 03:10 PM.

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    Member rick1964's Avatar
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    Quote Originally Posted by schick View Post
    I think what ever you end up with, it will require seal water in the packing and a latern ring . Typically taken from the perssure side of the system.
    Does anyone make a lantern ring for packing rope type seal? I could try to make one. Hell if I can make that darn Jet Pack I should be able to make a lantern ring. I can visualize how it should be made, but hooking it to a water supply would be tricky thru the housing. Plus I'd need a sand trap.

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    Member rick1964's Avatar
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    Heck we can darn near run our boats (or water craft) here in San Diego year round Lol, Winter doesn't necessarily mean we have to shut down here in S.D.! .

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    Senior Member jetboatperformance's Avatar
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    Quote Originally Posted by rick1964 View Post
    What kind of maintenance do they require? I am going to need a new shaft with that kind of seal right? Does the shaft/seal interface need any maintenance? What kind of life expectancy do those have? I'll post pictures of the pitting that the bore has which might shoot this whole mechanical seal down. I think I could use some kind of sealant during installation to seal the outer o-rings against the pitting...?
    If the pitting or corrosion in the housing bore is significant it may not seal or center properly (where packings will expand and conform under marginal conditions) that housing bore could however be bored and sleeved , similar circumstances apply to the pump shaft surface where the seals will ride, cannot be scored, worn or rough else it will damge the seal lips very quickly


  14. #12
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    Default Bore

    Here's a couple pics of the packing bore pitting in my suction piece. I'd imagine I'd have to have this honed and sleeved? Seems this might be bad enough to be part of my air suction problem. The pitting seems to be about 1/32 and 1/16th inch deep in places.
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    Senior Member jetboatperformance's Avatar
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    Quote Originally Posted by rick1964 View Post
    Here's a couple pics of the packing bore pitting in my suction piece. I'd imagine I'd have to have this honed and sleeved? Seems this might be bad enough to be part of my air suction problem. The pitting seems to be about 1/32 and 1/16th inch deep in places.
    Hope you dont take offense but that suction is done , time to recycle Rick

  16. #14
    Member rick1964's Avatar
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    The rest of the suction is in darn near new condition... this can't be saved? That's the only problem with it is that pitting. There's no way I could afford another suction piece.... What kind of price is a good used one?

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