How do you know when it's time for a rebuild?
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How do you know when it's time for a rebuild?

  1. #1
    Senior Member Minnesota_Duane's Avatar
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    Default How do you know when it's time for a rebuild?

    I have a 20' Hawaiian with a Berk 12jc and a 460. I dont know that the pump has ever been rebuilt. The boat currently runs 65 on a gps @ 5,400. I am wondering how does a pump act when it needs a rebuild, I have a couple impellers that I could use when rebuilding it both are Aggressor's I have a mag bronze A and an aluminum B. What would you guys choose to work best with my boat. What about choices for a wear ring. I hear good things about the ultimate wear rings.
    10,000 lakes so little gas money!

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    RPM at top speed will gradually climb over what it was, and top speed will drop off too, the pump will start to feel like it is slipping on take off or sudden throttle application. This occurs over time and may not be very noticable at first. We have had pumps in here that were original from the 1970s that still work fine, and we have seen guys kill a fresh pump in 2 months from the nasty habit of starting the engine on the trailer on the beach and winging the RPM to impress the locals. That practice sucks up a lot of sand and dirt/rocks from the bottom, killing the clearances and impeller leading edges in short order. You also should rebuild the pump whenever your local expert needs to make a house payment...LOL TIMINATOR
    MODESTY IS A CRUTCH FOR THE INCOMPETENT!

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    Senior Member Minnesota_Duane's Avatar
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    It's hard to tell about the RPM's. This is the 4th engine in 4 years, what makes me think it's time, is when I nail it from a stop it hits the rev limiter at6,000. If you are going along around 30 and lay into it the RPM's come up but not to the point of hitting the limiter and then as you stay in it you feel it hook up and increase speed. I assume it's cavitating while doing this, could this be the result of having a blocker loader on it
    10,000 lakes so little gas money!

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    Senior Member GT Jets's Avatar
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    Quote Originally Posted by Minnesota_Duane View Post
    It's hard to tell about the RPM's. This is the 4th engine in 4 years, what makes me think it's time, is when I nail it from a stop it hits the rev limiter at6,000. If you are going along around 30 and lay into it the RPM's come up but not to the point of hitting the limiter and then as you stay in it you feel it hook up and increase speed. I assume it's cavitating while doing this, could this be the result of having a blocker loader on it
    Maybe....But............

    Your pump sounds a little tired to me/ You could try a rock grate to see if the problem subsides, could be something minor, but they don't really cost that much to go through....

    You will blow more dough trying to fix it, then maybe have to build it anyway..Just my opinion.

    GT
    GT


    Quote Originally Posted by Quickjet View Post
    Put a 300 on the back of it, Flywheel it and a nosecone. $15,000 later you'll have a 65 mph pile of shit......

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    Senior Member Minnesota_Duane's Avatar
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    I am going to rebuild it just wondering which impeller to use. Will also be adding a split bowl and either a straight or a droop snoot and place diverter to get away from the Jetovator.
    I'm not looking to go much faster, some would be fine just want it to run like it should for what it is. I am hoping a snoot will help me loose the porposing, I have thought about pulling the intake and getting it machined for a shoe and ride plate.
    Last edited by Minnesota_Duane; 09-09-2009 at 10:29 PM.
    10,000 lakes so little gas money!

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    Shoe and rideplate will help top speed, launch and ride in rough water, good idea. Blockers are for motors that don't have enough HP to get into their power band with a full load of water, if you have a healthy and not overcammed engine, I would try it without the blocker, or with a loader and see what changes. You may be plesantly surprised. If the pump is working OK except at the launch and transient response, an inducer will cure your high rpm lauch issues, it will also help your fuel mileage.You can call me with further questions. 623-877-8553 Check your P.M.s for more info. TIMINATOR
    MODESTY IS A CRUTCH FOR THE INCOMPETENT!

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    Senior Member Minnesota_Duane's Avatar
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    Still wondering which impeller and wear ring I should use.
    10,000 lakes so little gas money!

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    Im picking up a rebuilt impeller and rebuild kit from duane at htp, told him what boat i had and what my plans for it were, and he told me what to run.

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