How to Change a Boat Prop?

Last Updated on October 1, 2022

If you’re a boat owner, then you know that there are a lot of moving parts. And, one of the most important is the propeller. If it’s not working correctly, your boat won’t move. 

So, how do you go about changing a boat prop? The most common is by removing the old prop and then installing the new one.

Well, read on to find out more easy ways you can follow to change your boat prop!

How To Replace a Boat Propeller?

  • Disconnect the propeller shaft from the engine.
  • Unscrew the old propeller from the shaft.
  • Clean the shaft and hub of any debris or corrosion.
  • Place the new propeller on the shaft and screw it on tightly by hand.
  • Reconnect the propeller shaft to the engine and tighten all bolts securely.

How to Remove an Inboard Boat Propeller?

If you need to remove an inboard boat propeller, there are a few different ways that you can do it. The most important thing is to make sure that the boat is securely moored before starting any work on the propeller. 

One way to remove an inboard boat propeller is by using a wrench.

First, locate the retaining nut on the back of the propeller shaft. This nut is usually located near where the propeller meets the hull of the boat. Use a wrench to loosen and remove this nut. Once the retaining nut is removed, you should be able to pull the propeller off of the shaft. 

Another way to remove an inboard boat propeller is by using a prop puller tool.

This tool attaches to the back of the propeller and uses leverage to pop it off of the shaft. Prop puller tools can be found at most marine supply stores. Once you have removed the propeller, inspect it for damage. 

If there are any cracks or chips in the blades, it will need to be replaced before being put back on your boat. If everything looks good, simply reverse these steps to install a new or repaired propeller onto your inboard boat!

How to Remove Boat Prop?

Removing a boat prop is not as difficult as it may seem. There are only a few tools that you need to remove the prop and with the right technique, you can do it yourself. 

Here are the steps on how to remove a boat prop:

Step 1: First, you need to disconnect the propeller from the shaft. You can do this by loosening the retaining nut that holds the propeller in place. Once the nut is loose, you can then pull the propeller off of the shaft.

Step 2: Next, you need to remove the cotter pin or split pin that secures the propeller to the shaft. Once you have removed this pin, you can then slide the propeller off of the shaft. 

Step 3: Finally, you need to clean up any debris that may be left on the shaft or on the propeller itself.

Once everything is clean, you can then reattach the propeller and tighten down the retaining nut.

How to Remove Propeller from Mercury Outboard Motor?

If you need to remove the propeller from your Mercury outboard motor, there are a few things you’ll need to do.

First, disconnect the engine from the power source. 

Next, remove the cotter pin and washer from the prop shaft.

Finally, use a wrench to loosen the propeller nut and remove the propeller.

Propeller Replacement

It’s important to note that most propellers have a lifespan of around 50-60 hours. So if you fly regularly, it’s likely that you’ll need to replace your props at some point. 

There are a few different reasons why you might need to replace your props: 

Damage: If your prop is damaged (e.g. bent or cracked), then it needs to be replaced immediately. Flying with a damaged prop is extremely dangerous and can cause serious damage to your drone and/or injuries to yourself or others. 

Wear and tear: Over time, even if your prop is not damaged, it will start to show signs of wear and tear (e.g. the tips may start to get frayed). At this point, it’s generally a good idea to replace theprop so that it continues to perform at its best.

Poor performance: If you notice that your drone is not performing as well as it used to (e.g. it’s not flying as smoothly or taking off/landing more difficult), then replacing the props may help improve performance. Sometimes props just need adjusting but other times they may need complete replacement .

How to Change a Boat Prop?

How Do You Remove a Boat Propeller?

Assuming you need to remove the propeller for maintenance: 

1. Start by disconnecting the propeller shaft from the engine. This will require loosening the set screws or bolts that connect the two together. You may need a wrench or socket set to do this. 

2. Once the propeller shaft is disconnected, you can pull it out of the housing. The propeller should now be detached from the boat.

3. To remove the propeller itself, unscrew any nuts or bolts that are holding it in place on the shaft. 

You may need a special tool called a prop puller to do this, which can be purchased at most boating supply stores. 

How Long Does It Take to Change a Prop?

It can take anywhere from a few minutes to an hour or more to change a prop, depending on the size and type of the prop, as well as the level of experience of the person changing it. It usually takes between 30 and 45 minutes to change a prop.

Generally, smaller props can be changed relatively quickly, while larger props may require more time and effort. Additionally, those who are experienced in changing props may be able to do so more quickly than those who are less experienced.

Is a 4 Blade Prop Better Than a 3 Blade Prop?

There is no definitive answer to this question as it depends on a number of factors, such as the type of boat, the size of the engine, and the water conditions. In general, a 4-blade propeller will provide more thrust and be more efficient than a 3-blade propeller, but it will also be more expensive. If you are unsure which propeller is best for your boat, consult with a qualified marine mechanic or dealer.

How Much Does It Cost to Replace a Prop on a Boat?

If you’re a boat owner, chances are you’ve had to replace a propeller at some point. Whether it’s due to wear and tear or an accident, replacing a prop can be costly. Depending on the size of your boat and the type of propeller you need, replacement costs can range from $100 to $1,000.

If you’re looking to save money on propeller replacement costs, there are a few things you can do. 

First, try to purchase a high-quality propeller that will last longer than cheaper options. 

Secondly, if your propeller is damaged in an accident, see if it can be repaired rather than replaced outright.

Finally, make sure you’re properly maintaining your boat and propeller so they’ll last as long as possible. 

Overall, replacing a prop on a boat can be costly, but there are ways to save money if you’re proactive about it. By purchasing a high-quality propeller and taking care of it properly, you can minimize replacement costs over time.


It is important to make sure that you have the correct size propeller for your boat. Installing a prop that is too small can be just as dangerous as having one that is too large. 

Make sure you take the time to do your research and find the right prop for your vessel. If you are unsure of how to install or change your boat propeller, seek out professional help. 

Be sure to apply some grease to the threads of the nuts before tightening them so they don’t come loose while you’re out on the water. That’s all there is to it! Now you know how to change a boat prop. So get out there and enjoy yourself!