Cause for very fast leak, any ideas?
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Cause for very fast leak, any ideas?

  1. #1
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    Default Cause for very fast leak, any ideas?

    Hi all,

    Well we got the new motor in and all hooked up on what I thought was the tail end of my 78' Glastron Carlson CVX 20 Resto,
    Did a lap around on the river, all good, came back to ramp, and when getting on the trailer, found an inch of water to the helm position, up to the exhaust logs in back.
    Any Ideas what may have caused water to come in so quick?
    It was 9pm and dark so no ideas yet, will run at the ramp this Weekend, but what Ideas come to mind that would let water in so quick.
    Just rebuilt the motor and didn't go thru the pump. I was told, last in good working order. It's a Berk JE12 w the cables on starboard,(right) side of pump)
    This is my first jet boat so don't know the ins and outs
    Boat had not run or been in water in 5 years prior to tonight.

    1) the plug was in
    2)could be the big ol exhaust thru hulls/hose connector
    3)lots of 5200 around both cable boots but I doubt that could have filled it so fast

    My concern from lack of knowledge about pumps,
    Is there a large internal boot or bellow that I should be thinking about, my big fear is that it's the joint between hull and cav plate/ride plate etc and I'll have to pull everything out again to reseal.

    I know there are lots of variables to consider here, just asking if there are any likely culprits that frequently plague this model Berk that I should check first.

    Thanks
    Evan

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  3. #2
    Senior Member GT Jets's Avatar
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    Almost had to have been hand hole cover on the pump... thats the biggest hole I can think of (so to speak).

    GT

  4. #3
    TRG
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    Float it on the trailer during daylight and see where its coming from?
    My kid brother bought a boat years ago and at speed it leaked real bad where the suction housing meets the intake, when we pulled the pump, numerous parts of the gasket were missing!
    You woulda thought it would leak like a siv, but idling there was a trickle, floating,...nothing, at speed?




    We were sinking!!

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  6. #4
    I'm No Expert Shaun's Avatar
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    Could be anything. I blew a bowl seal once and it let a huge amount of water in, i made one pass and when i got off it water came rushing to my feet.

    Could be the Handhole cover is not tight, check it and make sure.

    Check the packing seal on the pump too, last time i was out at the river i was getting a good amount of water in the boat, so much that i would run the bildge for 30 seconds every 5 minutes or so. I figured it was my headers lines and maybe i had a small leak around my transom cover. When i first launch the boat and start it i always idle out, put her in neutral and take a look at the engine area to make sure things look ok. I noticed a small stream of water comming out the packing seal, wasnt much but when your mashing the throttle it can turn into alot. I gave it a half turn, ran the boat for 15 minutes and the bildge had very little water in it.

    Since you mentioned logs, my buddy has a boat with a merc and the stock threw transom exhaust. He was getting water in his bilge area, i got down there while he was cruisin to find the rubber hoses that connect the exhaust peices where leaking water. Gave the hose camps a tightening and no more water.

    You just need to get back there and check it out during day light. Maybe even have sombody come along where you can check it while cruzin.

  7. #5
    Senior Member GT Jets's Avatar
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    Quote Originally Posted by toddnjuzz View Post
    Float it on the trailer during daylight and see where its coming from?
    My kid brother bought a boat years ago and at speed it leaked real bad where the suction housing meets the intake, when we pulled the pump, numerous parts of the gasket were missing!
    You woulda thought it would leak like a siv, but idling there was a trickle, floating,...nothing, at speed?




    We were sinking!!

    So the boat won't leak at night J/K It's the D' Julio speaking...

  8. #6
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    That's the plan, run it on the trailer in daylight hope to find it there.

    Thanks for all the good ideas, the hand clearing area is outboard and the transom hangover has a sight/arm hole, and cover, but that's above the waterline.

    The story from the previous owner was that the motor killed a main bearing from H2O in the oil.
    I replaced the motor (460 BBF out of my mechanic's friend's truck, 60K miles, 5000 since last rebuild, swapping in marine cam, new lifters and springs), only reusing the pan and accessories.
    He said the pump was fine, but not run since 2001. I'm hoping to not need to pull the motor again (hoping to not need to pull the pump)
    I remember looking at the exhaust thruhulls and thinking they looked big and underwater...and vunerable.

    Thanks again for all the replies and places to look.

    I'll report back on Sat.
    Evan

  9. #7
    "Try it Now!" Tahiti Boss21's Avatar
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    i had a fast leak with my 12 je pump, it was one of the bellows being shot..and the nut for the steering (underwater) came loose. I couldn't see it unitl i had the boat on the trailer..filled the bilge with water..and saw it start pouring out. And to quote HJ, "it's either that, or something else" good luck
    1992 Eliminator Daytona 21'

  10. #8
    jetboataholic HawaiianJet's Avatar
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    Quote Originally Posted by Tahiti Boss21 View Post
    i had a fast leak with my 12 je pump, it was one of the bellows being shot..and the nut for the steering (underwater) came loose. I couldn't see it unitl i had the boat on the trailer..filled the bilge with water..and saw it start pouring out. And to quote HJ, "it's either that, or something else" good luck
    LMAO
    HJ

    ***FOR SALE*** 1978 19' Full Stringer Hawaiian Molokai Jet Boat w/ Berkeley 12JC-AB and Chevy 440 Tall Deck ***FOR SALE***

    Quote Originally Posted by mako shark mark View Post
    Oh yeah, Forgot to mention that the hull is a special mixture of speedcote, herculiner and rain-x, all blended together- good for another 8 mph top end.

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    Senior Member CK7684's Avatar
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    Could be anything really. I just noticed that I have developed a small leak, just a pinhole size really, but it does fill things up faster than one would expect.
    Do yourself a favor a replace all the hoses on the system if you havent already. If one of those fails you will sink that boat FAST!!

  12. #10
    Boat Nut sleekcrafter's Avatar
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    check you cable bellows, coolant hoses, and for missing freeze plug on the block.

  13. #11
    Senior Member cave's Avatar
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    You can check for leaks at home. Run a garden hose into the bilge area. You don't need to fill it up much if its the suction housing. You'll see it start to leak. Drops or streams. If no leaks, I would replace the packing glands.
    Takin it home

  14. #12
    Senior Member CHEVY JET's Avatar
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    Personal Expereance, Check The Exaust Manafolds For Freeze Plugs. If One Is Out It Will Fill The Boat In A Hurry. Also Check The Water Hoses For Cracks.

  15. #13
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    Both #11 and #12. Also I had one with a petcock on the motor that was open. Pissed like a race horse. You should be able to hook a hose to the engine, turn on water and let it run. That woild show if it's coming from the block. You do have a garden hose hook up, or do they not do that any more?? Mine did. Disconect the pump when or if you do it.

  16. #14
    Half a bubble off jrork's Avatar
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    Hey Evan, let me know if you need an extra set of eyes. There's a lot of Gig Harbor Peeps that would be willing to help too.

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