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Have the RPM, but no power?
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| gacto |
Posted on 09/25/11 - 5:26 AM
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Went out yesterday for a crabbing trip with some buds from work. Boat ran AWESOME all day, until...we were in some back bay/mud ditches. Got into some shallow water. Got oout ok, but I then noticed the problem. Motor turning up the rpms, but no power. The prop/engine did not ground, so I don't think I spun the hub in the prop. Water pressure gauge shows fine. Any suggestions?
As a side note, I took pics of my cover and frame, will post them later for those who wanted them.
"People sleep peaceably in their beds at night only because rough men stand ready to do violence on their behalf." - George Orwell |
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| John Fyke |
Posted on 09/25/11 - 6:59 AM
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Check all your linkage and shiftshaft forward and backward to make sure it's going in gear.
John Fyke
Re-Fit or Reef It
1979 15' Sport with Super Sport conversion and 70hp mercury. |
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| Bake |
Posted on 09/25/11 - 8:22 AM
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What i have seen once on a friends boat was loss of power equaled a burnt piston. it would rev up in nutral but would not put the boat on plane. a simple compression check will rule this out for you. I hope you find something simple.
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| CES |
Posted on 09/25/11 - 9:32 AM
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I've spun a prop hub without hitting anything. When I pulled the boat out of the water, I couldn't spin the prop by hand however when under load the prop wouldn't take the pressure. I had the prop re-hubbed and it worked fine from then on out.
Cliff
1966 13' Sport with a 1993 40hp Yamaha 2 Smoker |
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| Tom W Clark |
Posted on 09/25/11 - 11:10 AM
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Motor turning up the rpms, but no power.
You need to explain what this means. It could be interrupted any number of ways. Could you be more explicit?
The motor is in gear but the boat does not move?
The boat moves but not very much?
The boat moves, just not quite as fast as before?
You can rev the motor in neutral (which has nothing to do with power) but not in gear?
The propeller is turning? Not turning?
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| JohnnyCW |
Posted on 09/25/11 - 1:07 PM
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CES wrote:
I've spun a prop hub without hitting anything. When I pulled the boat out of the water, I couldn't spin the prop by hand however when under load the prop wouldn't take the pressure. I had the prop re-hubbed and it worked fine from then on out.
I also had the same experience.
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| gacto |
Posted on 09/25/11 - 4:12 PM
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Sorry. I can push it up to full throttle, get the rpms and the boat speeds up, but then slows while maintaining the same rpm.
1988 70hp Merc
"People sleep peaceably in their beds at night only because rough men stand ready to do violence on their behalf." - George Orwell |
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| Tom W Clark |
Posted on 09/25/11 - 4:27 PM
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Ah, you just wrapped something around the gearcase when you were in shallow water and its causing the propeller to ventilate and loose grip.
That happens all the time to me here on Puget Sound. You pick up some seaweed or a stick or piece of driftwood and the prop looses all it grip and the engine races.
Either that, or you've spun the prop.
When you inspected the propeller and gearcase, what did you find?
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| John Fyke |
Posted on 09/25/11 - 4:33 PM
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The rest of the story. Hope it turns out well.
John Fyke
Re-Fit or Reef It
1979 15' Sport with Super Sport conversion and 70hp mercury. |
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