Prop slip

P

pasimard

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Aug 11, 2008
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2
I recently purchased a used 17' center console with a 75HP Mercury outboard. When I accelerate to plane the motor starts to "race" without the boat speed increasing. I checked the prop to see if the hub had broken loose but everything looks fine.

Any ideas.
 
JB

JB

Honorary Moderator Emeritus
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Mar 25, 2001
Messages
45,907
Re: Prop slip

Could you be ventilating the prop? You should be trimmed fully in while getting on plane.
 
C

CharlieB

Vice Admiral
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Apr 10, 2007
Messages
5,617
Re: Prop slip

Is isn't always appearant that the prop hub is slipping, did you look at the front side of the hub?

Mark the prop nut and the outer hub with a felt pen or scratch a line with a screwdriver, after you have run the boat and experienced this 'slip' then look at your marks, are they still lined up?
 
P

pasimard

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Joined
Aug 11, 2008
Messages
2
Re: Prop slip

CharlieB said:
Is isn't always appearant that the prop hub is slipping, did you look at the front side of the hub?

Mark the prop nut and the outer hub with a felt pen or scratch a line with a screwdriver, after you have run the boat and experienced this 'slip' then look at your marks, are they still lined up?
Click to expand...

Good idea. I'll give it a try.
 
S

sonnet

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Joined
Aug 12, 2008
Messages
2
Re: Prop slip

I have seen the splines worn on the hub,
allowing the shaft to spin as well.
 
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