Gearbox slips ?

[NZJoerg]

Hii, I am new here and hope somebody can help. I have a 115hp V4 from 1994.
Yesterday it ran good up to 3500 rpm and then when the boat goes out of the water it sounds like a manuel car when you push the gas pedal and the clutch at the same time and there was no drive anymore.
Hope somebody can help
Cheers from sunny hot New Zealand
Joerg

 

[tashasdaddy]

Re: Gearbox slips ?

take a boat for a spin, make it do what it is doing. if the lines are still line up, it is not the prop, if misaligned, the hub in the prop has slipped, and need to have a new hub installed by a prop shop, or a new prop.permanent marker, draw a straight line, to match cotter pin. like the picture. take the

 

[Vic.S]

Re: Gearbox slips ?

take a boat for a spin, make it do what it is doing. if the lines are still line up, it is not the prop, if misaligned, the hub in the prop has slipped, and need to have a new hub installed by a prop shop, or a new prop.permanent marker, draw a straight line, to match cotter pin. like the picture. take the

I suggest you try again when sober

Take a permanent marker, draw a straight line, to match cotter pin. like the picture.
Take the boat for a spin, make it do what it is doing. If the lines are still lined up it is not the prop, if misaligned, the hub in the prop has slipped, and need to have a new hub installed by a prop shop, or a new prop.

 

[CharlieB]

Re: Gearbox slips ?

Was the motor tilted/trimmed up? or down?

 

[NZJoerg]

Re: Gearbox slips ?

I am owning the boat now for 6 years, pretty sure the engine was in the right position.
And I don't drink and drive. You should have asked me 30 years ago and the answer could have been different.

 

[Vic.S]

Re: Gearbox slips ?

And I don't drink and drive

was referring to TD's post. it reads as though he had been celebrating the new year rather enthusiastically

Check the hub the way he says (or rather meant to say)

 

[CharlieB]

Re: Gearbox slips ?

You should have asked me 30 years ago and the answer could have been different.

Surprising how many of us can relate to that!

Have you inspected the prop for any damage, dents, dings, on the blades or skeg that could cause cavitation at speed?

 

[samo_ott]

Re: Gearbox slips ?

was referring to TD's post. it reads as though he had been celebrating the new year rather enthusiastically

Check the hub the way he says (or rather meant to say)

I also thought that was uncharacteristic of TD!

 

[NZJoerg]

Re: Gearbox slips ?

Hi again,
Now it is getting more difficult. Got your comments on board (the trim and tilt thing and the booze) and wonder the engine worked for the first half hour but then started again with the same thing. Had to drive back the whole Whangarei harbour on 2000rpm. I was lucky the tide came in.
Has anybody any idea?

 

[ezeke]

Re: Gearbox slips ?

Did you test the propeller to see if the rubber bushing between the inner and outer hub has worn? That is the most likely cause. Be sure that you have the thrust bushing and the spacer in place on the propeller shaft.

 

[Fisherball]

Re: Gearbox slips ?

Did you mark the hub like TD said? I think that's the ticket. I'm by no means an expert, more like an slightly educated novice but it sure sounds like your hub is slipping. If it is your gear box, 2,000 rpm for any length of time would sound like nuts & bolts in a blender. Check the fluid in your lower unit to see if it has metal shavings.