American Turbine ATJ ?
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American Turbine ATJ ?

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    Default American Turbine ATJ ?

    I have a American Turbine ATJ-309 (model before the the AT-309) and it rattles at low idle. after some research I see that there is a zerk fitting inside the nozzle area. mine does not have this. Am I missing parts?
    1990 ultra 21' open bow. 509, American turbine Jet

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    " Live Laterally " Dominator's Avatar
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    Tom at jet boat performance will know this question but I am curious to know if you have a stainless impeller or not?
    Last edited by Dominator; 07-14-2012 at 06:09 PM.
    " NO MOTOR NO BOATER "

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    Quote Originally Posted by Dominator View Post
    Tom at jet boat performance will know this question but I am curious to know if you have a stainless impeller or not?
    Thanks,. It is a new boat to me and have not torn apart. My guess would be no or the seller would have said so
    1990 ultra 21' open bow. 509, American turbine Jet

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    The question is does the noise dissipate or go away entirely when a slight load is put on the impeller (rpm increase) ? is the a rattling,clunking/growning noise your hearing while running on the trailer ? Likley if not a stainless impeller or bronze (heavy impellers cause this) its likley a phenomenum called "machine noise" which can result from a combination of wear between the pumpshaft male splines and the double Universal female yoke(splines) Noise is fairly common and not likley really a problem , call if you need more info Tom

    BTW re missing Zerk? are you refering to the lack of one looking in thru the steering nozzle at what would be the south end of the tail shaft ?

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    Quote Originally Posted by jetboatperformance View Post
    The question is does the noise dissipate or go away entirely when a slight load is put on the impeller (rpm increase) ? is the a rattling,clunking/growning noise your hearing while running on the trailer ? Likley if not a stainless impeller or bronze (heavy impellers cause this) its likley a phenomenum called "machine noise" which can result from a combination of wear between the pumpshaft male splines and the double Universal female yoke(splines) Noise is fairly common and not likley really a problem , call if you need more info Tom

    BTW re missing Zerk? are you refering to the lack of one looking in thru the steering nozzle at what would be the south end of the tail shaft ?
    Tom could this be cured by having the splined end of the shaft dipped in the blue teflon like coating that drive line guys are using now?

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    Quote Originally Posted by $uperJoe View Post
    Tom could this be cured by having the splined end of the shaft dipped in the blue teflon like coating that drive line guys are using now?
    Joe your ahead of me on this "trick" ,IF the noise is more than one can live with it can be "lessened" with a new shaft or drivline depending on which is really worn , some say to dope the splines with silicone , personaaly I would live with the noise depending on severity

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    Quote Originally Posted by jetboatperformance View Post
    The question is does the noise dissipate or go away entirely when a slight load is put on the impeller (rpm increase) ? is the a rattling,clunking/growning noise your hearing while running on the trailer ? Likley if not a stainless impeller or bronze (heavy impellers cause this) its likley a phenomenum called "machine noise" which can result from a combination of wear between the pumpshaft male splines and the double Universal female yoke(splines) Noise is fairly common and not likley really a problem , call if you need more info Tom

    BTW re missing Zerk? are you refering to the lack of one looking in thru the steering nozzle at what would be the south end of the tail shaft ?
    yes that is the zerk I am refering too. It does make the noise on the trailer at idle and it does go away at a slight load or higher rpm. Hard to explain the noise, kinda like rocks in a can and you can feel it in the floorboards plus it is not consistant-not there some times
    1990 ultra 21' open bow. 509, American turbine Jet

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    Senior Member jetboatperformance's Avatar
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    Quote Originally Posted by limited View Post
    yes that is the zerk I am refering too. It does make the noise on the trailer at idle and it does go away at a slight load or higher rpm. Hard to explain the noise, kinda like rocks in a can and you can feel it in the floorboards plus it is not consistant-not there some times
    Doubtfull given your description that theres anything wrong beyond shaft and spline wear , I'd rock it Tom

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    Had about 20 hours on a new driveline and shaft and it made that same rattle noise at idle.....no big deal I thu some grease at it and it helped for a while

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    Default I have the same model.

    Quote Originally Posted by limited View Post
    I have a American Turbine ATJ-309 (model before the the AT-309) and it rattles at low idle. after some research I see that there is a zerk fitting inside the nozzle area. mine does not have this. Am I missing parts?
    In inspecting the 22' boat I bought, I found out that the same model is in my boat. I'd love to share any information you have been able to locate. My turbine is also marked with a 9.25 DW behind the ATJ. I also do not have the zirk, sitting now at 101 hours, and hear the same thing you are hearing.

    Keep in touch. Performance wise, mine seems to be doing everything expected of it.

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    Quote Originally Posted by cinouye View Post
    In inspecting the 22' boat I bought, I found out that the same model is in my boat. I'd love to share any information you have been able to locate. My turbine is also marked with a 9.25 DW behind the ATJ. I also do not have the zirk, sitting now at 101 hours, and hear the same thing you are hearing.

    Keep in touch. Performance wise, mine seems to be doing everything expected of it.
    You wouldn't have a 22' Dana, would you?

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    Quote Originally Posted by limited View Post
    yes that is the zerk I am refering too. It does make the noise on the trailer at idle and it does go away at a slight load or higher rpm. Hard to explain the noise, kinda like rocks in a can and you can feel it in the floorboards plus it is not consistant-not there some times
    As Tom and others said, sounds like spline/yoke slop. Have the same thing on my AT-309 w/9.25" impeller. Turning the idle up a bit, so that the pump always has some load on it, helps get rid of it.

    Your "missing" zerk fitting probably just means you have the water-lubed bearing, like mine. You're looking at the end of the shaft when you look in the pump. No lube required....

    Matt

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