Will a bent boat prop cause vibration?

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Summer Kshlerin asked a question: Will a bent boat prop cause vibration?
Asked By: Summer Kshlerin
Date created: Thu, Jul 1, 2021 4:18 PM
Date updated: Thu, Jun 30, 2022 1:49 AM

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Top best answers to the question «Will a bent boat prop cause vibration»

Yes, a bend much less than that will cause a lot of vibration. Pull the prop and get it repaired.

8 other answers

The prop should be balanced to prevent vibration but often when you strike a hard object it may bend one blade towards the other and this will cause vibration. We can check props for balance and if bent we will send it to a specialist for repair.

Re: Prop causing boat to vibrate? What you describe on this prop it has to be out of balance and out of balance will cause vibration. The flat spotted blade and the nicked blades will all have different pressures on them in the water which would cause a vibration, another imbalance problem. Take it to a prop shop and get them to repair it.

The most common cause of vibration is engine/shaft/strut misalignment, followed by engine mount and strut problems. Bent or broken shafts. Drive system vibration that can damage transmissions, engine mounts and the boat hull itself. Vibration causes damage to other systems.

Does the vibration occur only when the engine is in gear? If Yes: Fouled propeller. Inspect propeller for rope, fishing line, weeds, or other fouling. Remedy: Remove fouling and clean the propeller. Bent, damaged, or missing propeller blade. Carry out a visual inspection of the propeller. Remedy: Repair or replace the damaged propeller.

Re: What are the symptoms of bent prop shaft? Vibration only when in gear, possibly some oil seal leakage around the shaft.

The vibrations mean the prop is no longer running in a balanced condition. Some blades are pushing more water than others. This will cause your prop shaft to move from side to side and wear on the bearing in the prop strut and stress the shaft seal assembly. If it's as slight as you say, you should be able to hammer it back into shape.

Metal prop blades are especially susceptible to destructive vibration if they are excited near a resonant frequency. One reason is that a metal blade contains very little internal damping, so resonant vibrations can build in amplitude very quickly.

First, don’t overlook the prop. A floating four-by-four can knock a blade out of pitch without visible signs. Check the shaft too. “If the tip of a propeller blade is bent over, there is a good chance the shaft is bent,” Fay says. Place a dial indicator at the taper and rotate the shaft, looking for no more than two-thousandths of wobble.

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