2017 Prostar - making noise when in neutral

Jerry44Jerry44 Posts: 75 Baller
... and boat is still moving. It sounds like the shaft is making a noise.

Any ideas?


  • MastercrafterMastercrafter Posts: 433 Crazy Baller
    It’s this when idling down quickly from ski speeds, or at 5mph then clicking into neutral?

    How many hours on strut bearings?
  • Jerry44Jerry44 Posts: 75 Baller
    5 mph then clicking into neutral. Boat has 207 hours.
  • jhughesjhughes Posts: 1,221 Mega Baller
    Possibly a noisy damper plate.
  • Jerry44Jerry44 Posts: 75 Baller
    On the damper plate, what would be the solution there?
  • BraceMakerBraceMaker Posts: 5,203 Mega Baller
    @Jerry44 pulling the trans and replacing it. But how sticky is the neutral? Ie running in neutral if you were to press say a handle of a hammer against the trans output shaft does it easily stop? Or is it basically in forwards gear unless you are in reverse.

    Two very different problems. Although it could just need the shift cable adjusted it might be just dragging in gear and therefore rattly.
  • Jerry44Jerry44 Posts: 75 Baller
    @BraceMaker I could be wrong, but I don't think it's the shifter but I will check those things you mentioned the next time I put it in. Thank you.
  • GloersenGloersen Posts: 1,271 Mega Baller
    might want to check engine coupler as well as prop connections
  • wski1831wski1831 Posts: 175 Baller
    Had a friend with a 17. The shaft came out of the coupler. Seemed extreme to me but master craft replaced the whole transmission under warranty
  • Jerry44Jerry44 Posts: 75 Baller
    @Gloersen when this started a couple of weeks ago, I checked the prop and it needed tightening and the cotter pin was missing.

    I tightened the prop and it seems like it stopped for a while but the noise started again. The prop is still tight.
  • GloersenGloersen Posts: 1,271 Mega Baller
    edited July 15
    @Jerry44 video below from SkiDim may assist with inspecting the drive shaft coupler integrity.
  • dchristmandchristman Posts: 1,388 Mega Baller
    @Gloersen well there's a trick I wish I would have known 40 years ago. Twice I ended up cutting off a coupler and replacing a shaft that could have maybe been straightened.
    Is it time to ski, yet?
  • MastercrafterMastercrafter Posts: 433 Crazy Baller
    Just went to replace a prop on a new-to-me 2017 Prostar, 1300 hours. Once prop was tight, still heard a weird rattle when I moved the prop back and fourth. Low and behold, all four trans coupler bolts were loose. Like scary loose. Check yer bolts!
  • AndreAndre Posts: 1,864 Mega Baller
    @Gloersen Ya,thanks for the link.I never knew Vince from SkiDim had a Youtube channel.
    Lots of interresting stuff for older boats.
    My ski finish in 16.95 ...but my ass is out of tolerance!
  • BraceMakerBraceMaker Posts: 5,203 Mega Baller
    @Mastercrafter you should see when a V-drive coupler nut comes off and the prop drops back to the rudder.
  • BraceMakerBraceMaker Posts: 5,203 Mega Baller
    @dchristman you mean the nut "press" method? That's super common in MC world because with the velvet drive 1.5:1's there is so little room for any of the other methods.

    I've also made slide hammer couplers so you pull the nut, bolt up the flanges and tappy tap tap from below - but when I do that I usually will put a block of wood between the flange and the gland nut as well to not put all the shock into the trans.

    And then again heat gun heat gun heat gun penetrating fluid and wham.
  • Jerry44Jerry44 Posts: 75 Baller
    I also need help / suggestions for removing the motorbox. I don't see a way to disconnect the hinges from the floor panel.

    Something I read somewhere else seemed to say to leave the motorbox connected to the floor panel.
  • MastercrafterMastercrafter Posts: 433 Crazy Baller
    You can leave them connected and remove together, or remove the nuts underneath the floor from the hinges; there are studs welded into the hinge, through the floor.
  • Jerry44Jerry44 Posts: 75 Baller
    edited July 16
    @Mastercrafter Thanks! Which way would you recommend? Another question... there are 4 screws in the floor panel. Are they holding the floor panel or is it just laying in there?

    On my Nautiques in the past it was just laying in there.

    Also looks like the fire extinguisher has to be disconnected. Is there anything special that needs to be done there?
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