Anybody Use Clay To Measure Clearance?
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Anybody Use Clay To Measure Clearance?

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    The Good mrjoshua's Avatar
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    Default Anybody Use Clay To Measure Clearance?

    I need to try a loaner impeller to see if the cut is right for my boat. The handhole is mid transom and I do not want to have to reseal the plates. The flywheel cover on the engine blocks the loader bolts from easy access. Anybody have a good method for checking wear ring / impeller skirt clearance using clay? I'm not looking for anything super tight .025-.035 will do fine. Thanks
    Last edited by mrjoshua; 05-01-2012 at 08:44 AM.

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    Senior Member jetboatperformance's Avatar
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    Quote Originally Posted by mrjoshua View Post
    I need to try a loaner impeller to see if the cut is right for my boat. The handhole is mid transom and I do not want to have to reseal the plates. The flywheel cover on the engine blocks the loader bolts from easy access. Anybody have a good method for checking wear ring / impeller skirt clearance using clay? I'm not looking for anything super tight .025-.035 will do fine. Thanks
    Joshua , you could try a small ball of clay at the backside of the WR lip , spray some Pam or WD , temporarily install the impeller no woodruff key (with nut) and then remove to measure the "crush" on the sample dont see why this wouldnt be effective , you could also pull your intake grate out and reach thru to check that direction Tom

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    Senior Member jet pilot's Avatar
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    Quote Originally Posted by mrjoshua View Post
    I need to try a loaner impeller to see if the cut is right for my boat. The handhole is mid transom and I do not want to have to reseal the plates. The flywheel cover on the engine blocks the loader bolts from easy access. Anybody have a good method for checking wear ring / impeller skirt clearance using clay? I'm not looking for anything super tight .025-.035 will do fine. Thanks
    would be hard to get an accurate measurement with the clay, I use a piece of solder to get my final clearance
    Last edited by jet pilot; 05-01-2012 at 09:15 AM.

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    Senior Member hihosilver's Avatar
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    or lead wire, it is very accuate

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    The Good mrjoshua's Avatar
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    Great ideas. Easier to measure than clay. Should I put it in 2 or 3 positions? Or will one do?

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    Senior Member Marcsrollin's Avatar
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    Cold tootsiroll still in the wax paper!
    No matter how good she looks , someone is tired of her shit!

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    Senior Member jet pilot's Avatar
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    Quote Originally Posted by mrjoshua View Post
    Great ideas. Easier to measure than clay. Should I put it in 2 or 3 positions? Or will one do?
    you could use it in two or three places and take an average measurement, at least two

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    DJG
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    Try using a long feeler gauge with the end bent through the back side of the impeller.
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  11. #9
    Jet boat service
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    If you have the proper wear ring for the impeller, the wear ring step should bottom out on the front of the impeller wear ring skirt at the same time it bottoms out on the rear step of the skirt. Using the pic above from DJG you can insert a wire spark plug feeler gauge in between the case and the impeller to reach the clearance on the rear corner of the impeller skirt. I use the kind of plug feeler gauge that has a 90 degree bend on the end.. This measurement should be the same as the front axial clearance between the shoulder of the ring and the front of the impeller skirt. I use this method often, but you have to have a 1.063 ring on a 1.063 impeller skirt or things will not match up right... Clear as Mud? Looks like DJG's method works good as well.. Jim
    Last edited by Performance Jet; 05-01-2012 at 08:49 PM.

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    Default Measuring

    You should measure with the bowl on, it centers the shaft and impeller to the wear ring. The shaft will sag down, giving a tighter tolerance at the bottom, and not be an accurate reading.
    Measure from the bottom up, threw the intake opening. It is a pain, but if you can't get threw the hand hole.
    Be safe, schick
    Half the people in the world are below average.

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    Super Moderator HammerDown's Avatar
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    Quote Originally Posted by jet pilot View Post
    would be hard to get an accurate measurement with the clay, I use a piece of solder to get my final clearance
    That what I used to set-up my rear axle bearing on my Corvette > works great!

    ALSO > remove the loader grate and go in from the underside > it'll be blind and all by feel.
    <img src=http://www.performanceboats.com/gallery/data/500/medium/06-30-11_1234.jpg border=0 alt= />

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