New to jet boats II
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New to jet boats II

  1. #1
    Member Rogers daycruiser fan's Avatar
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    Cool New to jet boats II

    Another question I have is plumbing the engine cooling system.

    I was wondering if any of you "Masters" of the jets have any tips on revamping the cooling system. I was wondering if I could put in a permanent tap to run my boat on the trailer that would have a ball valve so that i know it is shut when I am on the water. The previous owner had a garden hose set up that had a "wye" on it that fell off on my first trip which cause me to have NO cooling water going through the engine which caused be to burn up the head gaskets so I had the heads done and I putting the engine back together this weekend.

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  3. #2
    mo balls than $cents$ IMPATIENT 1's Avatar
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    never run your jetboat on the trailer, it damages the jetpump

    Dare to be different, if it turns out great you can claim you planned it that way.

    Jetboatperformance.com

  4. #3
    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
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    Quote Originally Posted by IMPATIENT 1 View Post
    never run your jetboat on the trailer, it damages the jetpump
    Unless said trailer is sitting in a very large body of water.
    "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.

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  6. #4
    Senior Member jetjunky's Avatar
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    Quote Originally Posted by SmokinLowriderSS View Post
    Unless said trailer is sitting in a very large body of water.
    Or you happen to have a jetaway.

  7. #5
    Member Rogers daycruiser fan's Avatar
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    If I cant run the motor on the trailer how do I know everything is OK before I go get it wet ? I dont want to run it any longer than to know timing is OK and it will start and stay running. I think 10 mins tops.

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    Dont do it..........

  9. #7
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    Quote Originally Posted by Rogers daycruiser fan View Post
    If I cant run the motor on the trailer how do I know everything is OK before I go get it wet ? I dont want to run it any longer than to know timing is OK and it will start and stay running. I think 10 mins tops.
    Leave it on the trailer, back down a ramp start it and let it run.

  10. #8
    Member eugene-rus's Avatar
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    Quote Originally Posted by Rogers daycruiser fan View Post
    If I cant run the motor on the trailer how do I know everything is OK before I go get it wet ? I dont want to run it any longer than to know timing is OK and it will start and stay running. I think 10 mins tops.
    Disconnect the pump from the engine. Make sure to connect water to the engine and exhaust. Here's how to do it right:
    1. Disconnect the pump
    2. Disconnect the pipe going out from the pump to the engine and connect it to a garden hose (with a tap inbetween). The tap MUST be closed.
    3. Start the engine
    4. Open the tap, depending on the water pressure it could be up to half-way. The less you open it, the sooner the engine will heat-up to the good-running temp.

    If you open the tap before the engine start, you will flood the block thru the exhaust.

    This has been discussed here many many times.

  11. #9
    Member Rogers daycruiser fan's Avatar
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    I have a water hose connection to the engine right now for a trailer test that gets closed off for the lake and the pump does the engine cooling then. I was just looking for some "Veterens" tips thats all. Dont want to wreck it, Thanks

  12. #10
    Amber Racing Services BUSBY's Avatar
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    Quote Originally Posted by Rogers daycruiser fan View Post
    I have a water hose connection to the engine right now for a trailer test that gets closed off for the lake and the pump does the engine cooling then. I was just looking for some "Veterens" tips thats all. Dont want to wreck it, Thanks
    Ok ... here's the deal.

    Your impeller and wear ring inside your pump use water to keep them cool and avoid damage. If you run your engine with the pump hooked up and there is no water going through the pump ... the friction will ruin your pump.

    As others have said, disconnect your driveline from the pump and hook the water up to the engine thru a garden hose. Make sure that you don't use full house PSI ... this could and will blow out engine gaskets (unless your house has poor hose pressure)


    You could stick a second hose up inside the nozzel, turn it on until water is flowing out the suction intake and run it for a short period ... but I don't recommend it for any longer than a couple of minutes.



    Good Luck.

  13. #11
    Senior Member 1975sleekcraft's Avatar
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    Quote Originally Posted by eugene-rus View Post
    Disconnect the pump from the engine. Make sure to connect water to the engine and exhaust. Here's how to do it right:
    1. Disconnect the pump
    2. Disconnect the pipe going out from the pump to the engine and connect it to a garden hose (with a tap inbetween). The tap MUST be closed.
    3. Start the engine
    4. Open the tap, depending on the water pressure it could be up to half-way. The less you open it, the sooner the engine will heat-up to the good-running temp.

    If you open the tap before the engine start, you will flood the block thru the exhaust.

    This has been discussed here many many times.
    i have heard this flood your engine thing here o few times.
    i have never flooded my motor nor have i seen anyone else flood their engine by running a garden hose through the cooling system.
    i know everybody dosent have this option, but look and see if you can remove your driveline!
    mine unbolts from the flywheel, 2 u-bolts, then i am runnin just motor.

  14. #12
    Member Rogers daycruiser fan's Avatar
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    Thanks, I hope to get this thing back together and by next week. I have been invited to New Melonas Lake up north and the family wants to go sooo I have to crack the whip and get it finished. Thanks for all of the tips everyone.
    !!

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