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  1. #1
    T MONEY$ spiffey28694's Avatar
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    Clanging noise in upper midshaft area

    Motor is a 1999 Merc 200 EFI

    Was about 500 yards from the ramp and running about 40 mph and all of a sudden a loud clanging noise coming from the upper part of the midshaft.....Thought I snapped a rod but enginge starts fine and goes in and out of gear fine and prop is not turning when in neutral. So I ruled out a drive shaft bearing and a drive shaft breakage. Only thing I can think of it being is the exhaust pipes running down that maybe one of them broke or blew a hole in the can not really sure any ideas? Got the boat Tuesday and it is already in the shop
    Hopefully it is not something major and can be a somewhat cheap fix. If you put your hand over the exhaust port on the midshaft area the noise gets quite but when you remove your hand it sound like someone is in the mid shaft area beating from the inside out with hammer
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  2. Mercury 3L/4 Stroke/Verado Moderator EuropeanAM's Avatar
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    #2

    Re: Clanging noise in upper midshaft area (spiffey28694)

    Remove the gearcase- reach up into the driveshaft housing with a long pry-bar and see if the exhaust tuner is still properly attached.

    If it IS properly attached... sample the gear lube (look for signs of water, metallic fragments, or metallic sheen in the gear lube).




    Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
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  3. T MONEY$ spiffey28694's Avatar
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    #3

    Re: Clanging noise in upper midshaft area (EuropeanAM)

    it is at the shop right now getting looked at.....If it is the tuner loose how hard of a fix is that and how expensive any parts needed or does a couple of bolts just need to be tightened back up?
    2017 BCB Eyra
    250 Pro XS
    Contemplating a 300R


    Serenity is falling asleep in the boat while getting a bite
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  4. Mercury 3L/4 Stroke/Verado Moderator EuropeanAM's Avatar
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    #4

    Re: Clanging noise in upper midshaft area (spiffey28694)

    Unfortunately- if it's the tuner, that's a very labor intensive repair.

    Powerhead and Adapter Plate must be removed to properly address.




    Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
    Still consider myself a "Marine Apprentice" after 48 years (learn something new every day).
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  5. T MONEY$ spiffey28694's Avatar
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    #5

    Re: Clanging noise in upper midshaft area (EuropeanAM)

    will it hurt anything to run it with the tuner loose? I am not talking forever. I have a club TX this weekend then after that I will have about 3 weeks to get it fixed before I leave for the everstart on seminole.
    2017 BCB Eyra
    250 Pro XS
    Contemplating a 300R


    Serenity is falling asleep in the boat while getting a bite
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  6. Mercury 3L/4 Stroke/Verado Moderator EuropeanAM's Avatar
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    #6

    Re: Clanging noise in upper midshaft area (spiffey28694)

    Although I've known of engines that ran for extended periods with the tuner "loose" in the midsection... they did not run well (some wouldn't even plane off)- and wear occurred to metal components that were rattling against each other (requiring replacement of additional components).

    Your choice, of course- but I'd get it addressed promptly, if it's indeed "loose".




    Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
    Still consider myself a "Marine Apprentice" after 48 years (learn something new every day).
    Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor

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