Stupid Question #1
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Stupid Question #1

  1. #1
    AAARRRRRGGGGGGG!!!!! Motomatt68's Avatar
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    Default Stupid Question #1

    I have been reading alot and trying to learn before I ask but I can not find the answer to this question.

    I have read that you should not run your engine when it is not in the water because it is hard on the pump. How can you tune it then? Do you have to disconnect the pump every time or only tune it on the river? How much damage does it do? Is a little alright? If I have run it out of the water how much damage have I done?

    Also, I am building/rebuilding an aluminum river boat that I am going to put a berkeley jet into. I hope this is the right forum.

    The boats I have seen here are amazing. I will try to get a picture of my boat and a little info about me on here soon.

    Thanks, Matt.

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  3. #2
    Senior Member 74glencoe's Avatar
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    Default driveline

    Quote Originally Posted by Motomatt68 View Post
    I have been reading alot and trying to learn before I ask but I can not find the answer to this question.

    I have read that you should not run your engine when it is not in the water because it is hard on the pump. How can you tune it then? Do you have to disconnect the pump every time or only tune it on the river? How much damage does it do? Is a little alright? If I have run it out of the water how much damage have I done?

    Also, I am building/rebuilding an aluminum river boat that I am going to put a berkeley jet into. I hope this is the right forum.

    The boats I have seen here are amazing. I will try to get a picture of my boat and a little info about me on here soon.

    Thanks, Matt.
    You should take out the driveline between the pump and flywheel. Depending on what driveline you have and what type of mounts you have it can get dang near impossible. I suggest you post up a picture of your driveline, engine, and mounts in order to get a better idea about how to get it done.

    You have the right forum for just about any jet boat, but you might find more specific info on alluminum boats elsewhere.
    Last edited by 74glencoe; 02-08-2010 at 07:29 PM. Reason: left out answer
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  4. #3
    Senior Member Brendellajet's Avatar
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    Default

    When you tow, gravel bouncing off your tires always ends up inside the pump and some of it finds its way in between the wear ring & impeller. Turning it over or worse running it is murder on the clearance between the two parts, making the pump dramatically less efficient. If you must run it on the trailer, find a way to disconnect them, otherwise tune it on the water.

    Also, a good habit to get into when putting it in the water, have the reverse gate lifted, and drop the boat in the water, then pull out to let the water drain. I do this 3 times. Every time. Doesn't take that long and my clearances remain tight.
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  6. #4
    Horsepower sells Engines lefty's pride's Avatar
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    Default

    well it is kinda hard to even tune out of the water the jet is loaded and will change engine rpm, at idle, witch will in-turn change most of your tune, normally i just take a buddy out to the lake with me to run the boat and i tune. if you gotta run it out of water i have done it before, at work we have a fire hose setup in our pit so i built a 90 degree holder that loads a crap load of water into the jet as well as hooking up the hose. the issue is there is very low cooling effect for your bowl bushing and very little water getting to your wear ring so if there is anything in that area it can cause scoring and lose of sealing. but on the other hand some guys do it with "no problems" not that im suggesting it. but like i started with the tune changes loaded to unloaded.
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  7. #5
    Member TrynPas's Avatar
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    Default

    Quote Originally Posted by Brendellajet View Post
    When you tow, gravel bouncing off your tires always ends up inside the pump and some of it finds its way in between the wear ring & impeller. Turning it over or worse running it is murder on the clearance between the two parts, making the pump dramatically less efficient. If you must run it on the trailer, find a way to disconnect them, otherwise tune it on the water.

    Also, a good habit to get into when putting it in the water, have the reverse gate lifted, and drop the boat in the water, then pull out to let the water drain. I do this 3 times. Every time. Doesn't take that long and my clearances remain tight.
    That never even occured to me. That's something I need to start doing......after my pump rebuild of course.
    Quote Originally Posted by HawaiianJet View Post
    You done got my kentucky ass all confused!!!

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