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post #1 of 9 Old 06-29-2012 Thread Starter
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Propeller not fully spinning

Hey guys. Im having an issue with my mariner 5hp engine. The propeller wont turn with any real force, at least not enough to move the boat. the engine will go into gear and the prop shaft will turn but the propeller barely moves at all no matter how much throttle i use. its like its not connected very well to the prop shaft if that makes any sense. Id appreciate any advice

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post #2 of 9 Old 06-29-2012
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Re: Propeller not fully spinning

If its old the prop is driven by a shear pin under the end cone and if its newer there is a rubber hub inside the prop that can fail

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post #3 of 9 Old 06-30-2012
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Re: Propeller not fully spinning

Almost certainly sheared rubber drive. I have fixed this with 3 M 5200 but you really want a replacement prop.
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post #4 of 9 Old 06-30-2012
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Re: Propeller not fully spinning

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Almost certainly sheared rubber drive. I have fixed this with 3 M 5200 but you really want a replacement prop.
The Merc props for our powerboat have replaceable hub kits. In fact: If you "spin the hub," as they say in the powerboating world, a new hub kit is what you need. And maybe a prop refurb (BTDT.)

With the engine off and the ignition locked out (so there are no mishaps) I would put the motor in gear and see if I could turn the prop in both directions by hand. If so: It'd be a spun hub.

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post #5 of 9 Old 07-01-2012
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Re: Propeller not fully spinning

Dont rule out the possibility of the cutless bearing inside the strut needing to be replaced.
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post #6 of 9 Old 07-01-2012
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Re: Propeller not fully spinning

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Dont rule out the possibility of the cutless bearing inside the strut needing to be replaced.
Cutlass bearing? Strut? On a 5HP outboard motor?

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post #7 of 9 Old 07-01-2012
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Re: Propeller not fully spinning

When in gear, only turn the prop by hand in the direction it will turn when running in gear. Otherwise you may damage water pump fins. They're a pretty tight fit and can break off on an older pump. This one should only be turned counterclockwise:

On a Johnson, the prop spinning could be the rubber clutch (called spun hub), or a shear pin breakage. The shear pin would make it so spins really easy whereas the spun hub would usually offer some friction. Here's a look at the rubber clutch on mine:

and the white plastic teeth it engages with when mounted:
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post #8 of 9 Old 07-01-2012
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Re: Propeller not fully spinning

Nice presentation Sea Dawg...
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post #9 of 9 Old 07-01-2012
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Re: Propeller not fully spinning

Sorry. I didnt see it was an outboard.
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