Results 1 to 9 of 9

Thread: Drivetrain

  1. #1
    Join Date
    Jul 2009
    Posts
    490
    Rep Power
    9

    Red face Drivetrain

    OK, so cruising down the lake at about 4,000 rpm when I hear a bang and then as I throttled down hearing a sound like beating a pan with a metal rod. Once I determined that I could proceed at idle speed I made it back to berth. Halfway home the noise subsided and then quit. Never tried to load or reverse. Boat guy will get to it later. But just curious if anyone else had such an issue? Stock Bravo unit with 500+ HP.
    Oledawg
    Raconteur, bon vivant, curmudgeon
    Other duties as assigned


    Lake Tillery, NC
    - Heart of the Uwharrie Mountains

    '88 Donzi Classic 22 "Bad Nuff" - 482 stroker 454, Bravo One, Solas 4 blade, Red/White hull, White Deck ( "drivin" boat )

    '87 Correct Craft Riviera "Oledawg" - 454 PCM ( "cruzin" boat )


    "A man without a boat is a prisoner" - Faronese proverb

  2. #2
    Join Date
    May 2003
    Posts
    2,035
    Rep Power
    18
    D*mn you gotta just love boat problems .
    How on earth could a noise like you describe completely go away after a few minutes and everything seems fine ?

    I'd be angrier that it stopped than kept doing it .

    Wish I had some more constructive input for you though .
    Just because something's old doesn't mean you throw it away !

  3. #3
    Join Date
    Jul 2010
    Posts
    510
    Rep Power
    0
    B.O.A.T. I'm sure you know the long version!!!!

    John C
    '92 Sweet 16 302 Ford-Reborn in 2017
    Windshields are for Sissies !!!

    If you're lucky enough to live on the St. Lawrence River, you're lucky enough!!!

  4. #4
    Join Date
    May 2004
    Posts
    2,854
    Rep Power
    16
    Did the sound come the drive or the engine?

    Ken

  5. #5
    Join Date
    Jul 2009
    Posts
    490
    Rep Power
    9
    From the drive, either bell housing or the upper. Engine running fine, just under a load from something maybe sporadically binding.
    Oledawg
    Raconteur, bon vivant, curmudgeon
    Other duties as assigned


    Lake Tillery, NC
    - Heart of the Uwharrie Mountains

    '88 Donzi Classic 22 "Bad Nuff" - 482 stroker 454, Bravo One, Solas 4 blade, Red/White hull, White Deck ( "drivin" boat )

    '87 Correct Craft Riviera "Oledawg" - 454 PCM ( "cruzin" boat )


    "A man without a boat is a prisoner" - Faronese proverb

  6. #6
    Join Date
    May 2003
    Posts
    2,035
    Rep Power
    18
    OK , I thought a bit and might have something a little more constructive to offer 2nd time around .
    It might not be your problem but it never hurts to throw these experiences out there.

    We had an unknown alignment issue a few years ago that when it manifested itself it made noises from the back of the boat that sounded like someone dragging anchor chain up onto the deck of a tin boat . It would do it completely randomly , start unexpectedly , last a few seconds and then stop . Never knew what it was until after an hour or two the splines on the coupler disappeared !
    Just because something's old doesn't mean you throw it away !

  7. #7
    Join Date
    Apr 2013
    Posts
    22
    Rep Power
    0
    I had a noise on my Z25 KC drive that sounded exactly as you describe this one and it turned out to be the upper gear set exploded........ and this happened with a very mild 460 at the time, maybe 400 horse on a good day. route cause in my situation was in sufficient oil, the bearing failed and over the engine i could not hear the noise until it was too late and the gear set failed. if you havnt already take a look inside your outdrive and see if you can see anything, never know you may get lucky with a minimal repair.

  8. #8
    Join Date
    Feb 2017
    Posts
    10
    Rep Power
    0

    Noise

    If the out drive was not the cause of the noise it could have been caused by the windage tray . Maybe it cracked near one of the mounting bolts and the crankshaft was hitting it. The only other thing could have been a bolt,nut or a washer flying around inside the adapter housing .
    Hope you can find out what it was.
    Kenny n.
    Retired Mercrusier, OMC. Volvo & Berkeley shop owner.
    1980 18' Classic, 383 MPI/ Alpha

  9. #9
    Join Date
    Jul 2009
    Posts
    490
    Rep Power
    9
    Sound was behind the engine, either bell housing or upper drive.
    Oledawg
    Raconteur, bon vivant, curmudgeon
    Other duties as assigned


    Lake Tillery, NC
    - Heart of the Uwharrie Mountains

    '88 Donzi Classic 22 "Bad Nuff" - 482 stroker 454, Bravo One, Solas 4 blade, Red/White hull, White Deck ( "drivin" boat )

    '87 Correct Craft Riviera "Oledawg" - 454 PCM ( "cruzin" boat )


    "A man without a boat is a prisoner" - Faronese proverb

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •