running a jet boat out of the water
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running a jet boat out of the water

  1. #1
    Member car_guy_turned_jetboater's Avatar
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    Default running a jet boat out of the water

    I have the T valve to tie into the cooling system, but I thought I read somewhere its bad to turn the impeller when its not in the water,

    I want to run it about 20-30 minutes,

    do I have to pull the drive yokes or is it just a precaution?

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    Member bennyb's Avatar
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    I've heard yes and no also,but, after taking apart and spending good money to make my pump really nice I won't be spinning it out of water.
    20'5 Advantage classic cruiser
    Go on get your ass outa here

  4. #3
    lol, right..... Devilman's Avatar
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    I would disconnect the driveline. I have started mine on the trailer, momentarily (which I have been told is still not good), but no way would I run it for any extended amount of time. Especially not for 1/2 an hour......

    Disconnect your driveline, I'm sure your pump will thank you for it.

  5. #4
    Super Moderator HammerDown's Avatar
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    I'm not a "pump pro" but I've rebuilt a few...clearance is clearance.
    I set my pump up on the snug side and since (I) rebult it I KNOW the bowl bushings are good AND I zero out the impeller on the shaft on a lathe so the Impeller isn't going off center to where the impeller may touch the wear ring.

    So with that being said, I've NEVER seen one bit of evidence running (my) pump out of the water or the other few I've rebuilt has proved to be a bad thing...HOWEVER...I always make sure there's water going to it to flush any road dust from the ramp to my home. AND...I don't go rapping on the throttle none stop. I ONLY run my engine enough to make sure a few things happen...the engine fires, check the gauges, tune up/rev to 3000 rpm if needed, and make sure nothing appears to be wrong before I tow to the ramp and maybe inconvenience others.

    *I don't have the option to disconnect the drive train...with a 3-point mount/bell housing it's impossible.

    The ONLY time I had a problem was the first time I rebuilt my pump and it locked in the water under load...THE REASON...the new ZKL thrust bearing was BAD and after teardown showed well over .030 in foward movement.
    Once sent to Mr Papp he comfirmed this and was gracious enough to replace all affected parts and gaskets. Needless to say Tom and I tested the new thrust bearing before I installed it.
    <img src=http://www.performanceboats.com/gallery/data/500/medium/06-30-11_1234.jpg border=0 alt= />

  6. #5
    Boss of the McIntyre Mob danhercules's Avatar
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    The seal in the front of the pump is kinda like a rope dipped in wax and is around your shaft. Water drips from there into the boat to keep it cool. You cannot do this with a water hose. Its done with pressure.

    I have fired mine. Fire and off. I dont think that is a big deal, but more than a second or two, take off the driveline.


    Very first TPR 21' Deck. 528 BBF 736hp on pump gas built by High Flow Dynamics

    McIntyre Mob. Where the rejects play!

  7. #6
    Super Moderator HammerDown's Avatar
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    Quote Originally Posted by danhercules View Post
    The seal in the front of the pump is kinda like a rope dipped in wax and is around your shaft. Water drips from there into the boat to keep it cool. You cannot do this with a water hose. Its done with pressure...
    True, unless the pump has the newer/better GFO square graphite packing that virtually needs no water...Good stuff!

    *The old white waxy wire impregnated stuff is still ok for a brief fire up of the engine. Spray some WD40 at the face it'll be fine.
    <img src=http://www.performanceboats.com/gallery/data/500/medium/06-30-11_1234.jpg border=0 alt= />

  8. #7
    use a BBC to pull a BBC devanwon's Avatar
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    I heard just dont do it as a general rule, just my .02 cents

  9. #8
    Senior Member sleekvino's Avatar
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    this is off the berkeley pump web page bottom of the page....
    http://www.berkeleyjet.com/faq.aspx

  10. #9
    Senior Member moneysucker's Avatar
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    Can I run my pump while the boat is on the trailer?
    Running the Berkeley out of the water:
    A Berkeley pump can be run out of the water as it has a greased thrust bearing and lubricated tail shaft bushings. The impeller does not touch the wear ring, but due to the fact that the bottom of the pump is open during trailering the boat, it is best to run water into the pump through the nozzle while running on the trailer. The only issues with running out of the water is that after about 15 to 20 minutes the bowl seal can get hot from lack of cooling and cause seal damage. The packing gland may have to be re-tightened when the boat is used the next time as well.





    And there you have it. From the above link.

    Cy


  11. #10
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    I ran mine for 20 minutes to break in the motor. I cannot disconnect mine due to the saftey collar around the u-joints. I would have had to install engine, braek it in, then remove to connect. I ran water into the nozzle and into the intake, and havent had problems yet. That was over a year ago

    Dan

  12. #11
    Senior Member CHRISG82's Avatar
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    Default Out Of Water Run

    i Run In Mostly Salt Water So After Every Day Out I Have To Flush The Motor. I Have A "y" Connecter Female Hose Fitting With Two On, Off Outlets, Connected To The Outlets I Have Two 6 Foot Lenths Of 3/8 Heater Hose,one Goes To The T-stat Housing, One Into The Nozzle.works Great For Me!!

  13. #12
    Senior Member NiceGuyEddie's Avatar
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    Never ever unless you have to. But even then stick a garden hose in the pump if you plan to run it for more than 5 seconds. When you trailer the boat a bunch of debris gets sucked into your pump. Why must some people be too fockin lazy to disconect the driveline? I dont get it. But hey its your boat, do what you want.

  14. #13
    Super Moderator HammerDown's Avatar
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    Quote Originally Posted by rIVERtRASH View Post
    ...Why must some people be too fockin lazy to disconect the driveline? I dont get it. But hey its your boat, do what you want.
    How bout this...let me see (you) disconect (my) driveline to run the boat for 5-seconds...it would be easer to pull the engine!
    Then we'll see who's the "fockin lazy" boat owner.
    <img src=http://www.performanceboats.com/gallery/data/500/medium/06-30-11_1234.jpg border=0 alt= />

  15. #14
    Senior Member GAWnCA's Avatar
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    I asked Berkeley about running the pump out of water and got the same answer as stated above in FAQ area. So I run a line to my hose connection and leave the ball valve open enough to let water go both to the pump and the motor. I did the cam break in one the trailer, 2200 RPM for 25 minutes and have started and timed it in the driveway. People talk about road garbage getting into the pump intake, well, running in the river and coming across some sallow water you can get more than that going through the pump, like ROCKS, sand, sticks, etc.

    The boat and pump run great with no effect on the pump or motor or impeller or bearings/bushings. Keep the pump somewhat wet for some lubrication and the water flowing through the motor and you should be just fine.

    You won't pick up stuff like this off the drive to and from the water. This came out of my impeller from the last trip out.



    KEEP IT WET!
    Wags

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