engine/pump spacing
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engine/pump spacing

  1. #1
    Retired Air Force Master Sergeant's Avatar
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    Default engine/pump spacing

    How much space should be allowed for pump flex within the shaft between the pump and the engine?

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    Senior Member Brendellajet's Avatar
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    Pretty sure I went with 3/16".
    "He is a lover, not a fighter. But he's also a fighter, so dont get any ideas."

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    B1 Racing cs19's Avatar
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    .125

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    I installed an engine w/ what I am guessing not enough space and ruined my engine as it pushed the crank into the side of the block. All the rod bearings were spun, it is trashed.

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    It would typically wipe out the thrust, then maybe send trash through the engine and wipe out the rods etc. How's the thrust?

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    Crank, rods and pistons all unusable. Block has scores in it from the crank but is OK. Am thinking a new 540. 572 or 604?

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    This is on the new motor?

    Jerry

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    Senior Member stoker2001's Avatar
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    Quote Originally Posted by billet racing View Post
    This is on the new motor?

    Jerry
    Dont ask...
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    Hey Jerry,come up to CFW this Sat for test and tune,weather should be great
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    Senior Member lbhsbz's Avatar
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    go with 3/16"-1/4" to be safe......I set up my last boat with about .060", and it leaned on the crank. You're gonna have some hull flex as well as deflection in the thrust bearing under load.
    GN7: "If you were to have ever had two brain cells you could rub together and make heat, you be dangerous"

  12. #10
    Senior Member H20MOFO's Avatar
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    It probably goes with out saying but make sure your dl isnt twisted....you may have it set ok...but it may be hanging up on a twisted shaft. Just throwin it out there.
    Another Hot Boat refugee

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    Quote Originally Posted by billet racing View Post
    This is on the new motor?

    Jerry
    Yes. A lot of money wasted on such a seemingly small detail. Have a bigger engine in works though

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    Member E Rock's Avatar
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    on topic and ignorant question. can you put enough space between motor and pump, to disconnect the drive line for dry starts?

    if you guys are only using .060 or 1/4 inch, how in the world would you have enough room to disconnect the drive line without sliding the motor forward? or is that just that..... you have rails and slide the motor forward?

    in other words, if i have just an h-bar with a slip yoke going into the pump, can I space the two apart enough to disconnect from the flywheel and slide the driveline back enough to clear? for dry start purposes.

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    Default spacing

    Quote Originally Posted by E Rock View Post
    on topic and ignorant question. can you put enough space between motor and pump, to disconnect the drive line for dry starts?

    if you guys are only using .060 or 1/4 inch, how in the world would you have enough room to disconnect the drive line without sliding the motor forward? or is that just that..... you have rails and slide the motor forward?

    in other words, if i have just an h-bar with a slip yoke going into the pump, can I space the two apart enough to disconnect from the flywheel and slide the driveline back enough to clear? for dry start purposes.
    Yes you can. I did that one year at the drags. Every time I had to warm up the motor, disconnect the driveline covers and the ujoint. Pain in the ash.

    Jerry

  16. #14
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    Quote Originally Posted by Master Sergeant View Post
    Yes. A lot of money wasted on such a seemingly small detail. Have a bigger engine in works though
    I knew I'd get along with you for some reason. Bigger is always better. But your wife would not ride in the boat as it is, how is she going to go faster?

    Jerry

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