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If we want to give a short definition of a spun propeller we would say that it is the weakness of responsiveness to the rotation of our engines propshaft which is due to the detachment of the rubber hub of the propeller and to its following wear because of the friction and temperature increase. Spun hub prop pinning just something i wanted to trythese vintage boat clubs say to pin it this old outboardresurrecting small outboard motors.
So how to you replace a spun hub.
Spun hub on boat prop. A damaged propeller or spun prop hub mainly delays the boat getting on the plane. When the prop hub becomes spun insider the propeller the propeller starts spinning freely and will not harmonize with the prop hub. A spun hub feels like a loss of power with excessive RPM.
You will likely feel the prop slipping at high RPM. Sometimes the hub only spins when the engine revs above a certain RPM causing many boaters to wonder if they have spun a hub are experiencing ventilation or cavitation or have some kind of gear or power issue with their outboard. Does your boat prop have a spun hubThis is a problem every boat owner should know how to fix and the good news is that its much easier to fix than you migh.
Comments 1 If your boat motor is running and in gear but your prop isnt spinning then you might have a spun hub. The hub is a piece of plastic designed to break if you hit something with your propits a safety feature so that none of the more expensive parts break. The good news is that its much easier to fix than you might think and in.
How to Fix a Spun Propeller. Inspect the propeller first to determine if the hub has spun inside the propeller. Pull the cone off the front of the propeller using the pliers.
Loosen and remove the lock nut from the propeller shaft by turning it counter-clockwise with a ratchet extension and a socket. Pull the propeller straight off the shaft. There are instances when the prop hub can become spun without impact.
Older-style rubber hubs can become hard with age and begin to slip within the barrel until they eventually are no longer firmly bonded to the prop. Exhaust heat can also deteriorate the rubber or Delrin material. In this case the spun hub could be a warning of a bigger problem such as a worn or failed water pump.
If you happen to hit something with the proplightly its job is let the shaft spin when the prop stops on a object so that the lower units gear dont take the blunt of the hit. The plastic hub is replaceable and cheap compared to a lower unit. So spinning a hub means your prop hit something and the shaft kept spinning breaking its teeth on.
After looking at a few forum posts we then checked to see if we had a spun hub. Pulled the prop off and the rubber piece inside the prop looked like it had some burned up rubber on it. We put the prop back on pulled the lanyard and put it in gear without any power and tried to spin the prop.
The shaft and nut turned with the prop. You can detect a spun hub just by looking for circular scratches on the portion of the hub that bears against the thrust washer. The splines on the shaft keep the thrust washer from slipping so if the propeller has a spun hub it will become scratched as it rotates in relation to the thrust washer.
Learn how to distinguish between a spun hub and other boat engine and propeller problems. A spun propeller means that the prop hub has spun inside the propeller. Once the hub spins inside of the propeller the propeller will spin freely and not along with the hub.
A hub can spin inside of a prop due to damage to the hub damage to the inside diameter of the propeller or incorrect propeller. Spun hub prop pinning just something i wanted to trythese vintage boat clubs say to pin it this old outboardresurrecting small outboard motors. You might be at risk of spinning the hub on your prop.
Heres how to prevent it from happeningCome check out the best Bass Fishing videos from BassResource. June 6 2017 at 645 pm 1697871. Heres what I think it is The older EvieJohnson props were joined to the prop shaft with a shear pin with a solid joining between the prop shaft and prop blades in the casting.
The newer props have a vulcanizing of rubber between the housing that goes around the prop shaft and the blades. If we want to give a short definition of a spun propeller we would say that it is the weakness of responsiveness to the rotation of our engines propshaft which is due to the detachment of the rubber hub of the propeller and to its following wear because of the friction and temperature increase. Spun hub propeller bushing replacement - YouTube.
Spun hub propeller bushing replacement. If playback doesnt begin shortly try. Is there any way to tell if prop spun on hub Id do it this way.
Put the prop back on the propshaft shift it into forward gear have somebody jam the flywheel with a screwdriver or something and try to turn the prop backwards by hand. If it moves backward the hub is broken. I just made that method up but it should work.
A spun propeller means that the prop hub has spun inside the propeller. Once the hub spins inside of the propeller the propeller will spin freely and not along with the hub. A hub can spin inside of a prop due to damage to the hub damage to the inside diameter of the propeller or incorrect propeller installation.
If the hub has spun you will have to take it to a prop shop for a hub replacement. This can cost between 5000 to 7500 and some prop shops will not guarantee the new hub to hold. 2nd - The incorrect propeller thrust washer.
The propeller thrust washer must match the type of propeller being using. With your hands you should be able to turn the prop one way but not the other way. If you can easily turn it one way that is fine.
Apply a little more torque by hand to try and turn it the other way. If it turns and feels like it is actually slipping then the hub is slipping. This is not totally foolproof as the hub has to be pretty well spun out.
Pein a dot on the metal splined hub and adjacent on the mating surface of the propeller proper. Reinstall the propeller and go for a ride. Run the engine under load.
Merely idling dockside may not flow enough torque to challenge the hub. After a few minutes remove the propeller and examine your handiwork. If the dots no longer line up then the rubber hub is spinning in its bore.
So how to you replace a spun hub.