Table of Contents
Can a spun prop be repaired?
A spun propeller means that the prop hub has spun inside the propeller. Fixing a spun propeller will require the assistance of a boat propeller repair shop to press the old hub out of the propeller and the new hub into the propeller.
How much does it cost to fix a spun hub?
Prop hub replacement cost is often anywhere from $50 to $100, depending on your engine and where you take it. Fixing the prop requires pressing out the old hub and replacing it with a new hub. If you have the proper tools, you can do this process yourself.
What causes prop cavitation?
Face propeller cavitation occurs on the driving face of the propeller and is often due to an incorrect pitch distribution along the length of the blade resulting in the tip pitch being too small and the blade sections developing a negative angle of attack. Its results are frequently found on controllable pitch units.
Should my prop spin freely in neutral?
No it shouldn’t be able to spin freely when it’s in gear. When u put it in forward and u turn it u should have to really pull on it to get it to go around.
Is it bad to run an outboard engine at full throttle?
Does this mean an engine should never run at wide-open throttle (WOT)? Absolutely not. Modern engines are designed to handle WOT. Also, during break-in going to WOT, as prescribed by the owner’s manual, is necessary to properly seat the pistons’ rings.
What is a propeller hub kit?
Here’s a quick look at the evolution of prop hubs, the vital assembly that connects an engine’s propeller to its drive shaft and simultaneously acts as a shock absorber should a prop strike an underwater object. It was designed to break — or “shear” — off if the propeller hit an object.
Do all props have a hub?
All Rubex props use interchangeable rubber hubs. There you have it!.
What is prop slippage?
Propeller slip is the difference between the actual distance the prop travels forward through the water versus the distance it should theoretically travel based on the prop blades’ angle of attack. The theoretical travel is determined by the prop pitch.
How does a prop hub work?
The hub is an integral component located on the exterior of the ship that is connected to the propeller blades. As the hub rotates, the blades are also forced through the water. For a transfer of torque, the hub is connected to the marine shaft through the stern tube and surrounding bearings.
What causes prop ventilation?
Ventilation is the result of air or exhaust gases being pulled into the propeller blades. This causes the blades to lose their grip on the water, the engine RPMs go up and the forward speed of the boat is reduced. Ventilation can also come from exhaust gases being introduced into the blades of the prop.
Why is cavitation bad?
Cavitation causes pump performance deterioration, mechanical damage, noise and vibration which can ultimately lead to pump failure. Vibration is a common symptom of cavitation, and many times the first sign of an issue. Vibration causes problems for many pump components, including the shaft, bearings and seals.
How do you fix cavitation problems?
Try the following: Reduce motor speed (RPMs). Install an impeller inducer. Incorporate a booster pump into your pump system. If possible, reduce the temperature of your pump, liquid, and/or other components. Increase liquid level around the suction area.
Do propellers spin in neutral?
Always stop, turn around and SHUT OFF the engine before pulling someone to safety. It is NEVER safe to board or exit from the water while engines are idling because the propeller may continue to spin even when the boat is in neutral.
Can turn prop when in gear?
Nope, prop is fine. You just have the L/U off from what position the gear shift was in. You need to remove your L/U and sinc it to the gear shift better. You could be one quarter turn off and even though it’ll act as neutral when the gear shift is center it could be right at the edge of catching reverse.
Which way does my prop spin?
That is, which way does my propeller turn? Propeller rotation is no different; a right hand propeller rotates Clockwise viewed from the stern of the boat looking forward. A Left hand propeller rotates Counter Clockwise viewed from the stern of the boat looking forward.
Should you cover your outboard motor?
So don’t cover the motor. If you have your boat shrink-wrapped, ask them to either work around the motor, or leave gaps around the transom so some air can get to the motor.
How far below the bottom of the boat should the prop be?
If you have a short shaft motor, the top most part of the transom and the lower most part of the boat should be about 15 to 16 inches. For a long shaft, I think 20 to 21 inches is correct.
How often should you start your outboard motor?
A few hours every week keeps the motor in better shape than using it two or three full days every month. The more often it gets used, the better it will run, just like any vehicle. If it’s left sitting idle at the marina or in a garage for the majority of the time, parts tend to go bad faster.
Are Rubex props any good?
Their make is high quality stainless steel, with Solas’ high performance materials and a rubber rub. While the Rubex are quite good for big boats that cruise on mid-range speed, they provide quality mileage for most size boats.
