Clearance ??? on the Pump
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Clearance ??? on the Pump

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    Senior Member TNYoungblood's Avatar
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    Default Clearance ??? on the Pump

    Hey guys could some of you pump gurus please explain what is the proper way to measure and set your pump clearances.

    If you have a couple different impellers to try out, what is needed to be checked before you install the impeller ??

    Thanks


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    WFLC The REAL #321 Kentucky Drag Boat Association 2016 NJBA 10.0 High Points Champ

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    Senior Member sandeggo's Avatar
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    Saw a video one time by Berkeley that showed how to do it. Impeller to suction housing clearance. More to it than just that and I'm by no means an expert whatsoever

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    Senior Member Chop Shop's Avatar
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    Industry secret. Hush hush.

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    You can go to cp performance website and check out the manuals listed there. Youtube has some pretty decent videos too.
    Last edited by fastmarlene; 11-12-2012 at 12:12 PM.

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    BTC cardcarrying member sunkisst's Avatar
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    Quote Originally Posted by Chop Shop View Post
    Industry secret. Hush hush.
    Hmmm, thats exactly what I was thinking this morning when I read this question. I just didnt have the balls to say it.

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    Mike, to try to exchange impellers make sure that they are of the same size, not stating the obvious but know the difference/tolerances of the skirt-wear ring area. lay the impeller on a known flat surface and measure the over all height and check for differences. to see if there will be a difference of how far it will seat into the wear ring take a measurement from the outer height of the wear ring to the nose or hub of the impeller. this difference will determine to add or remove shims on the shaft. also watch for the difference on the tail of the impeller so that it wont hit the inside of the bowl. will take some exacting measurements, hope this helps.

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    Senior Member TNYoungblood's Avatar
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    Quote Originally Posted by Chop Shop View Post
    Industry secret. Hush hush.

    Not lookin for any secrets just the how to. I gotta good pump man, it's just been dead in here and I'm sure I'm not the only guy that would like to do this stuff the right way
    WFLC The REAL #321 Kentucky Drag Boat Association 2016 NJBA 10.0 High Points Champ

  10. #8
    Senior Member TNYoungblood's Avatar
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    Quote Originally Posted by johnray069 View Post
    Mike, to try to exchange impellers make sure that they are of the same size, not stating the obvious but know the difference/tolerances of the skirt-wear ring area. lay the impeller on a known flat surface and measure the over all height and check for differences. to see if there will be a difference of how far it will seat into the wear ring take a measurement from the outer height of the wear ring to the nose or hub of the impeller. this difference will determine to add or remove shims on the shaft. also watch for the difference on the tail of the impeller so that it wont hit the inside of the bowl. will take some exacting measurements, hope this helps.

    That's the info I'm lookin for, thanks Johnny
    WFLC The REAL #321 Kentucky Drag Boat Association 2016 NJBA 10.0 High Points Champ

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    whats the ideal measurement between the wear ring/impeller and the impeller/shoulder? isn`t there a thrust/bend factor and does the material used for the wear ring have to be taken into consideration?
    Last edited by Richard Till; 11-12-2012 at 02:27 PM.

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    Senior Member TNYoungblood's Avatar
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    Quote Originally Posted by Richard Till View Post
    whats the ideal measurement between the wear ring/impeller and the impeller/shoulder? isn`t there a thrust/bend factor and does the material used for the wear ring have to be taken into consideration?

    That's the secret shit Richard, were not allowed to ask that
    WFLC The REAL #321 Kentucky Drag Boat Association 2016 NJBA 10.0 High Points Champ

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    Senior Member H20MOFO's Avatar
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    I dont have the equipment to check my stuff. Outta curiosity...if a fella wanted to check his clearances. What would be the money best well spent.

    I guess you need a large mic to meas the impy....can the same tool meas the wear ring?

    I dont now how too loose is..... I can tell its time to go through my pump again.

    Slippin outta the hole....lost 5 mph....ect.

    How tight is too tight?
    Another Hot Boat refugee

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    Senior Member jetboatperformance's Avatar
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    Quote Originally Posted by H20MOFO View Post
    I dont have the equipment to check my stuff. Outta curiosity...if a fella wanted to check his clearances. What would be the money best well spent.

    I guess you need a large mic to meas the impy....can the same tool meas the wear ring?

    I dont now how too loose is..... I can tell its time to go through my pump again.

    Slippin outta the hole....lost 5 mph....ect.

    How tight is too tight?
    Kreg without getting to elaborate with your tool investments You could spend a few well spent bucks to purchase a 9/12 inch dial caliper for your purposes and measure your impeller skirt, however it would likley be less effective to try to measure your wear ring (shaft in) Your impeller (if standard) should be 7.225 , W/R should be 7.250 "contrast" is .025.Your "tire spin" could be several different things Tom

    Check out Starret brand Dial Calipers

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    Senior Member H20MOFO's Avatar
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    Quote Originally Posted by jetboatperformance View Post
    Kreg without getting to elaborate with your tool investments You could spend a few well spent bucks to purchase a 9/12 inch dial caliper for your purposes and measure your impeller skirt, however it would likley be less effective to try to measure your wear ring (shaft in) Your impeller (if standard) should be 7.225 , W/R should be 7.250 "contrast" is .025.Your "tire spin" could be several different things Tom

    Check out Starret brand Dial Calipers
    Thanks Tom. My pump has seen some abuse. I will look at that link.
    If someone wanted to tighten up a pump....what increments do wear rings come in.....cause mine is gettin lose.

    Btw...got my diverter cable today....thanks
    Another Hot Boat refugee

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    Senior Member jetboatperformance's Avatar
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    Quote Originally Posted by H20MOFO View Post
    Thanks Tom. My pump has seen some abuse. I will look at that link.
    If someone wanted to tighten up a pump....what increments do wear rings come in.....cause mine is gettin lose.

    Btw...got my diverter cable today....thanks
    Typically in increments .005 os but you would want to asess (and measure) the impeller first and Thank you ! Tom

    Mike sorry for the thread tangent !

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