American Turbine Pump Question
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American Turbine Pump Question

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    Default American Turbine Pump Question

    Just a quick question, I was messing around with the forward reverse gate and looked inside the bowl of the pump and saw a zerk fitting inside? I hit it with my grease gun but what is it lubing? I don't think this has ever been lubed in 10 yrs since this new unit was installed on the boat??

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    Sit N' Spin Jetaholic's Avatar
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    Quote Originally Posted by 257scramjet View Post
    Just a quick question, I was messing around with the forward reverse gate and looked inside the bowl of the pump and saw a zerk fitting inside? I hit it with my grease gun but what is it lubing? I don't think this has ever been lubed in 10 yrs since this new unit was installed on the boat??
    That's the grease fitting for the shaft tail bearings. The tail end of the main shaft passes through the hub of the bowl. The whole shaft/impeller assembly is suspended from the thrust bearing up front while the tail bushings in the bowl hub support the shaft's tail end.



    Quote Originally Posted by HammerDown
    Kendall L-427 Super Blu...extreme-pressure (ep) lithium complex keeps my thrusting balls happy
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    Thanks for the quick response. How often should i hit it with the grease gun?

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    Sit N' Spin Jetaholic's Avatar
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    Quote Originally Posted by 257scramjet View Post
    Thanks for the quick response. How often should i hit it with the grease gun?
    I usually do mine once a season.

    If the internal shaft seal is still good, when you grease that fitting you will start to feel resistance on the pump handle on your grease gun as it fills up. You'll know when it's full because you won't be able to pump it anymore.



    Quote Originally Posted by HammerDown
    Kendall L-427 Super Blu...extreme-pressure (ep) lithium complex keeps my thrusting balls happy
    Quote Originally Posted by back2k5 View Post
    Well I am putting in a nice stereo system in the Carrera...maybe Ill put on some rap and turn the scoop sideways

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    Senior Member jetboatperformance's Avatar
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    Dang! I had a whole page Tech article on Performance Grease Zerks ....

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    You'll know when it's full because you won't be able to pump it anymore.[/QUOTE]
    interesting

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    Quote Originally Posted by chevy View Post
    You'll know when it's full because you won't be able to pump it anymore.
    interesting[/QUOTE]

    lol, i thought the same. sounds like a good way to pop out the bowl seal to me i personally wouldn't recommend just pumping away on it till you can't pump anymore, that's a bad thing

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    Boat Nut sleekcrafter's Avatar
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    Genuine American Turbine bowls, have two seals, and are retained by a snap ring.
    Upper Midwest Power Boat Association
    DRAG BOAT RACING UMPBA #926


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    mo balls than $cents$ IMPATIENT 1's Avatar
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    Quote Originally Posted by sleekcrafter View Post
    Genuine American Turbine bowls, have two seals, and are retained by a snap ring.
    so do power steering pumps but i change those all the time too much pressure on any seal will pop it outwards, not the actually seal body, but the sealing lip can be forced out under too much pressure, that snap ring just holds it in place while it happens. can't tell ya how many of my buddies have grease balanced wheels on their boat trailers cause they "kept on pumping" and rolled the seal out.all it takes is 1 lil hot spot in the seal and it'll grab the shaft and go forward because the shaft moves forward some under power. just my 02, makes sense to me anyways

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    Well, i kind of figured not to pump the grease into any fitting until i can't pump anymore as common sence tell me it might blow out the seal. Thanks for the advice though and quick answers..

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    The way those seals are installed is to keep water out of the bushings. Now I did leave out one step...after pumping till I can't pump the gun anymore, I remove the zerk to relieve any pressure, then re-install the zerk.

    The way those seals are positioned, the grease can still run out of the seal when it expands due to heat, just like it does through the suction seal behind the thrust bearing.
    Last edited by Jetaholic; 08-12-2009 at 08:26 AM.



    Quote Originally Posted by HammerDown
    Kendall L-427 Super Blu...extreme-pressure (ep) lithium complex keeps my thrusting balls happy
    Quote Originally Posted by back2k5 View Post
    Well I am putting in a nice stereo system in the Carrera...maybe Ill put on some rap and turn the scoop sideways

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    Quote Originally Posted by IMPATIENT 1 View Post
    so do power steering pumps but i change those all the time too much pressure on any seal will pop it outwards, not the actually seal body, but the sealing lip can be forced out under too much pressure, that snap ring just holds it in place while it happens. can't tell ya how many of my buddies have grease balanced wheels on their boat trailers cause they "kept on pumping" and rolled the seal out.all it takes is 1 lil hot spot in the seal and it'll grab the shaft and go forward because the shaft moves forward some under power. just my 02, makes sense to me anyways
    Yup, I did this to my AT bowl when I first owned it... wrecked the seal and had to pop in a new one.

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