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Mercruise 5.0 lossing speed not rpm

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  • Mercruise 5.0 lossing speed not rpm

    after running for 20 min on my merc 5.0 with B1 at RPM 3000 to 3200 for 15 to 20min A humming sound from the engine. Loss of speed no loss of rpm. Shift to neutral for a minute shift back and runs good for the next 10 minutes then repeat.
    checked the prop at a shop no problem there. same problem w/my other prop. No problems at 2000 rpm. I have no mercruiser dealer near by. need help on what can it be.

  • #2
    Either spun a engine coupler or spun a prop hub, my guess is the coupler.
    Did you smell any burning rubber?
    94 Formula 27PC Custom 509MPI MEFI3 , B3 XR
    95 Rinker 232 w/ 7.4L Carb 0F425011 B1 0F486471
    07 Seadoo GTX
    Merc Adults Only VP Adults Only
    G-Dad always said "First Liar doesn't stand a chance"


    • #3
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      Cone clutch not grabbing fully ?