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Thread: Bravo Problem

  1. #1
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    Bravo Problem

    Went out for a cruise yesterday. Everything went well, did 75 miles.
    Until........Let Lulu drive for a bit, just cruised across the lake at varying speeds from 30-60 mph, just to give her her first lesson in driving. Went well.

    We stopped about 1000 yards from the entrance to the inlet that leads to the ramp. I took over and idle most of the way in. I decided to speed up some and when I put the throttle down, the boat started to move and then some kind slippage occurred and the boat would not go faster regardless of rpms. Slowed back to idle and tried it again, and again. Nothing.

    Fortunately, the boat still moved forward in gear and I idled back to the dock.

    Things look for?? Check the rubber hub on the prop. If that is OK, pull the drain plug and check the fluid for filings???

    Sound like the correct first steps??? Suggestions appreciated.

    Bob
    Member - WAFNC
    1997 22 Classic (sold)
    1997 Formula 271 Fastech
    502 Mag MPI

  2. #2
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    Prop rubber hubs often shrink & slip as the props get old.
    Swap props & re-test
    Also~
    Check the outdrive's shift cable for proper adjustment & It's proper shifting and drive clutch operaton.
    Last edited by silverghost; 05-08-2011 at 01:31 PM.
    "BENCHSEAT 18" ~~YellowJacket~~ project owner~
    1929 Chris~Craft 28' Tripple Cockpit Mahogany Speedboat / A-120-A 845 Cu.In. 375 H.P. Chris~Craft V-8 racing engine.
    24' American Skier
    Super Eagle 454 HO Skiboat
    1991 454 SS Chevy Super Sport Pick-up for towing my "Toys".

    There is no such thing as going too fast ~ ~~
    OR~ Being too old~ for a new "Toy"!

    Brad Hunter
    Huntingdon Valley Pa (Just outside Philly)~
    Ocean City NJ
    silverghost1926@msn.com
    215 947 4676 (PA Home)

  3. #3
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    Does sound like a spun hub. Try another prop or mark yours and see if alignment changes.
    Lake St. Clair, Lake Huron, Lake Erie, Lake Oakland

  4. #4
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    Usually when these prop hubs start to slip~~~
    They start to slip at the same engine RPM.
    This is the torque where the rubber will break-loose.

    If you continue to use that slipping prop the rubber will melt and he maximum RPM where the prop will slip will slowly drop.

    Look for stickey & gummy rubber inside the prop's hub.

    Don't just toss-out your old prop~
    A good prop repair shop can usually press-in a new rubber center hub.
    The old Volvo 270-280 replacment hubs are getting hard to find~ If any here have an older Volvo drive ?
    The new replacment Bravo hubs are a very easy & cheap repair job.
    Last edited by silverghost; 05-08-2011 at 02:24 PM.
    "BENCHSEAT 18" ~~YellowJacket~~ project owner~
    1929 Chris~Craft 28' Tripple Cockpit Mahogany Speedboat / A-120-A 845 Cu.In. 375 H.P. Chris~Craft V-8 racing engine.
    24' American Skier
    Super Eagle 454 HO Skiboat
    1991 454 SS Chevy Super Sport Pick-up for towing my "Toys".

    There is no such thing as going too fast ~ ~~
    OR~ Being too old~ for a new "Toy"!

    Brad Hunter
    Huntingdon Valley Pa (Just outside Philly)~
    Ocean City NJ
    silverghost1926@msn.com
    215 947 4676 (PA Home)

  5. #5
    mrfixxall Guest

    Fixx

    Seaweed?? could be one cause..next time out try putting it in reverse then forward,,could have been a little slop in the shift cable..

    like said already..pull prop off and inspect the hub,,it you have a flotorqur hub pull the guts out in the prop and inspect..

  6. #6
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    Got some time this afternoon. Will pull the hub and see what she look like and go from there.

    B
    Member - WAFNC
    1997 22 Classic (sold)
    1997 Formula 271 Fastech
    502 Mag MPI

  7. #7
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    Photos

    Here are a couple of photos.

    The center black section tapped out rather easy. I would think this is supposed to be bonded to metal hub?

    Does the metal part have to pressed in/out?

    B
    Member - WAFNC
    1997 22 Classic (sold)
    1997 Formula 271 Fastech
    502 Mag MPI

  8. #8
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    Now that I think about it, I was going about 40 and hit a gator about 20 minutes prior to this problem starting. This might have started to break the hub loose.

    No, I am not kidding.

    B
    Member - WAFNC
    1997 22 Classic (sold)
    1997 Formula 271 Fastech
    502 Mag MPI

  9. #9
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    Unhappy

    The rubber hub in that prop is designed to absorb vibrations & act as a sheer device .
    Similar to an old fashoned sheer-pins.
    When you hit that gator that hub probably saved your outdrive & engine by sheering & breaking loose..

    I wonder how well that ol gator survived that propeller strike ?

    Poor Gator~~~
    I was not his day !
    "BENCHSEAT 18" ~~YellowJacket~~ project owner~
    1929 Chris~Craft 28' Tripple Cockpit Mahogany Speedboat / A-120-A 845 Cu.In. 375 H.P. Chris~Craft V-8 racing engine.
    24' American Skier
    Super Eagle 454 HO Skiboat
    1991 454 SS Chevy Super Sport Pick-up for towing my "Toys".

    There is no such thing as going too fast ~ ~~
    OR~ Being too old~ for a new "Toy"!

    Brad Hunter
    Huntingdon Valley Pa (Just outside Philly)~
    Ocean City NJ
    silverghost1926@msn.com
    215 947 4676 (PA Home)

  10. #10
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    I spun one hub in my lifetime and it was on a Merc 200 OB. It didn't hit anything. It let go with no warning and the boat would only move at idle speed. There was also no visual indication of any problem with the hub. I knew what it was because that is the only thing that can slip without making noise. I had it repaired. On an outdrive I think the only other possibility would be the coupler.

    Whoa, just saw the gator post! Mark the prop and hub and see if the marks move. The problem is not always visible.
    Lake St. Clair, Lake Huron, Lake Erie, Lake Oakland

  11. #11
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    The insert is suppose to come out easy it is just an adapter, try another prop see what happens if all is well just get that one re-hubbed.
    No matter what your beliefs are "GOD BLESS AMERICA"

    Semi retired marine tech over 50 years in the biz.

  12. #12
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    Quote Originally Posted by Tidbart View Post
    Now that I think about it, I was going about 40 and hit a gator about 20 minutes prior to this problem starting. This might have started to break the hub loose.

    No, I am not kidding.

    B
    Adding "have you hit any gators recently?" to standard diagnostic questions...
    "I don't have time to get into it, but he went through a lot." -Pulp Fiction

  13. #13
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    Gators ?

    In Philly here we don't have to worry about hitting any gators on the Deleware river~~~
    Just floating telephone pole sized logs, , dead mobsters & ex- street gang members.
    They are called "Floaters" around here .
    Every spring ~~~When the water warms-up just after the spring rains~~~
    they come floating up to the surface .
    Last edited by silverghost; 05-08-2011 at 06:16 PM.
    "BENCHSEAT 18" ~~YellowJacket~~ project owner~
    1929 Chris~Craft 28' Tripple Cockpit Mahogany Speedboat / A-120-A 845 Cu.In. 375 H.P. Chris~Craft V-8 racing engine.
    24' American Skier
    Super Eagle 454 HO Skiboat
    1991 454 SS Chevy Super Sport Pick-up for towing my "Toys".

    There is no such thing as going too fast ~ ~~
    OR~ Being too old~ for a new "Toy"!

    Brad Hunter
    Huntingdon Valley Pa (Just outside Philly)~
    Ocean City NJ
    silverghost1926@msn.com
    215 947 4676 (PA Home)

  14. #14
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    I suppose a coupler would be noisy, I remember mine was.
    But the outcome was similar as it wluld pull no faster than 2100 RPM.
    George Carter
    Central Florida
    gcarter763@aol.com
    http://kineticocentralfl.com/


    “If you have to argue your science by using fraud, your science is not valid"
    Professor Ian Plimer, Adilaide and Melbourne Universities

  15. #15
    mrfixxall Guest

    Fixx

    Quote Originally Posted by Tidbart View Post
    Here are a couple of photos.

    The center black section tapped out rather easy. I would think this is supposed to be bonded to metal hub?

    Does the metal part have to pressed in/out?

    B

    post a pic of the piece that goes in before the prop nut..it should lock in the 4 slots and and have splines in the middle of it..im wondering if the piece in the center whoich may still have splines in the middle may have broke..if its a solid hub then that piece that slid out may just be a spacer..


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