running boat out of water
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running boat out of water

  1. #1
    Senior Member Jetboat Jared's Avatar
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    Default running boat out of water

    so i have the hose hooked up to the boat should i have the hose turned on all the way or just like 1/2 turn or what?

    thanks for any help guys

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    Senior Member H20MOFO's Avatar
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    Your about to hear a bunch of peeps tell you to disconect your driveline 1st. Do you have water injected headers? If so I disconect the lines to those 1st. A 1/2 turn or so should be pretty close depending on your water pressure. If you see the temp getting too hot, turn the water on more.
    Another Hot Boat refugee

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    Senior Member Jetboat Jared's Avatar
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    no i have logs and i really dont want to disconect my driveline. because i have to basically remove the engine then.

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    Senior Member Brendellajet's Avatar
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    Ill be the first. Its cheap insurance to pull the driveline. Depending on your pump clearances and the amount of debris that builds in the pump when towing, running the boat with the driveline on is really beating the hell out of the wear ring & impeller. You may not notice a decrease in performance right away, but there will come a time when you do.
    "He is a lover, not a fighter. But he's also a fighter, so dont get any ideas."

  7. #5
    Glendale Arizona Squirtcha?'s Avatar
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    How long are you figuring on running it out of the water? What is it you're looking to do?

    Breaking in a cam (20 minutes)? Wouldn't recommend it unless driveline is disconnected.

    Starting it to see if it will start and run for a few seconds?.......Still wouldn't recommend it,
    but better than the cam break in deal.
    Last edited by Squirtcha?; 05-05-2009 at 02:50 PM.

  8. #6
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    Quote Originally Posted by Brendellajet View Post
    Ill be the first. Its cheap insurance to pull the driveline. Depending on your pump clearances and the amount of debris that builds in the pump when towing, running the boat with the driveline on is really beating the hell out of the wear ring & impeller. You may not notice a decrease in performance right away, but there will come a time when you do.
    Brendellajet I sent you a pm on the carb.

  9. #7
    Senior Member H20MOFO's Avatar
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    I'm not sure if it's the best method, but I've fired mine up for a short blast to check for fuel leaks ect. I pulled the inspection cover(mines outside the boat) and had my kid spray hose water full blast in there to get the wear ring. Maybe there is a better way,,,,,I dunno??? Btw it's harder to get em to do that the 2nd time.lol
    Another Hot Boat refugee

  10. #8
    About 500' AGL MudPumper's Avatar
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    Not this thread......AGAIN!!!

  11. #9
    Jet boat service
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    I don't think that running on the trailer for a tune check is any big deal if you are set up right. I do it all the time with my customers. Make sure you have water in the bowl/wear ring area. I have a hose set up with a wye and two valves. One hose goes to the motor and one hose goes to a sprinkler head that I set up at the intake under the boat right at the grate or loader. This will keep the wear ring, shaft and packings happy. I have checked wear rings on boats that I have run this way for years and have not noted a problem from this method. I have even broke in a cam or two this way. You just have to be careful and use some common sense, no reving over 2 grand. When I do blueprints for customers I tell them not to run out of water for the first year because I don't trust them to do it properly. And I warranty my jets. When a customer is building a new motor and jet combo, I set the motor in , break in the cam and set tune before the new jet gets installed. Its always better to be safe but if you have to tune on the trailer, do it right and you should be OK. Jim

  12. #10
    Junior Member Apache86's Avatar
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    I Have Not Had Any Problem Tuning Or Breaking In A Cam This Way, You Simply Have To Have The Impeller / Wear Ring Wet Before You Start As Said In The Previous Post , If You Have Water Injected Headers , Turn On 1 Side Of Y First(the One Going To The Pump) Then Start The Boat ,and Turn The Engine Water On While It Is Running , Then Turn The Engine Water Off First Before You Kill The Engine, This Will Allow You To Not Have To Dissassemle The Water To The Headers ,,,,,,,, Its Safe

  13. #11
    LP-25.com Infomaniac's Avatar
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    Question from me on this subject.

    So if you just want to warm up the engine.

    I was considering putting in a "T" before the shut off valve. And running water backwards into the pump. No water to the engine.

    To warm up in the pits at the races. No water hose available.

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    I Have A 72 Horizon Jet And 1 Month Ago I Rebuilt My Pump For The First Time Since 75 Other Than Changing Bowl Bushings. I Had The Front Shaft Bearing Go Bad. After That Many Years, There Was A Lot Of Running On The Trailer And All Internals Looked Good.

  15. #13
    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
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    Quote Originally Posted by Jetboat Jared View Post
    so i have the hose hooked up to the boat should i have the hose turned on all the way or just like 1/2 turn or what?

    thanks for any help guys
    You NEED as much water in that pump as possible, 2 or 3 garden hoses, runningt wide open.

    Water is the ONLY "lubricant" between the wear ring and impeller.

    Go to a lake and just back it in.
    "As democracy is perfected, the office of president represents, more and more closely, the inner soul of the people. On some great and glorious day the plain folks of the land will reach their heart's desire at last and the White House will be adorned by a downright moron."
    H.L. Mencken

    OBAMA: Some people deserve this.
    The rest of us are being dragged along kicking and screaming.

  16. #14
    Senior Member bajadad's Avatar
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    Quote Originally Posted by MudPumper View Post
    Not this thread......AGAIN!!!
    Chimed in to listen.....

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