Boat Propeller

A Step By Step Guide to Changing Your Boat Propeller With Mercury Marine

Anglers and boaters alike all know the struggle of changing out a boat propeller. Whether you’re removing the boat propeller for maintenance, or replacing the boat propeller for better performance and durability, this process can leave you frustrated and scratching your head.

We’ve been there!

So, we decided to help everyone out by giving you step by step instructions for removing and installing a boat propeller on your outboard engine.

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Removing Your Boat Propeller Step By Step

Removing Your Boat Propeller: Step #1

Before getting to the nuts and bolts of this operation, you must first equip yourself with the tools to get the job done. Now, you’ll need a socket, usually 1 1/16” will do the trick, but if you have a socket set, we recommend having that handy as not all sizes are the same and can vary by manufacturer. Once you figure out your socket size, equip yourself with a 2X4 or 2X6 piece of lumber, this will act as a stopping mechanism to hold the propeller in place and prevent the propeller from spinning when removing the nut. A final piece of equipment you can have at your disposal would be a torque wrench for installing your propeller which we will get to later.

Removing Your Boat Propeller: Step #2

Once you have the necessary tools listed above, you’re ready to dive into removing the propeller. Take your socket and fit it onto the nut, use your other hand to hold the 2X4 in place until the propeller makes contact, creating a wedge. Once the block is in place, you can then begin using the socket to remove the propeller, moving counterclockwise.

Removing Your Boat Propeller: Step #3

Once the nut has been removed, you’re ready to remove the propeller and other pieces. Simply slide the propeller up and off of the drive shaft. Be cautious in this process as to not lose or misplace any of the smaller pieces like the aft adaptor or delrin sleeve. Make sure to note the order in which these pieces were placed prior to removal in the case that they fall out of the propeller during removal. Once all these components are removed, you have successfully removed the propeller!

Now that you’ve successfully removed the boat propeller, you’re ready to perform maintenance like removing grass or fishing line wrapped around the drive shaft, greasing the drive shaft, or simply grab your new propeller and get ready to install!

Installing Your Boat Propeller Step By Step

Installing Your Boat Propeller: Step #1

In the case that you’ve removed components like the aft adaptor and delrin sleeve, the first step of this process would be adding the delrin sleeve to the bottom of your propeller. From there, you can take your aft adaptor and slide it into the top of your propeller. Once your assembly is ready and set inside the boat propeller, you’re ready to slide the entire assembly onto the drive shaft!

Note: It may take some time aligning the assembly onto the drive shaft, simply rotate the assembly until the assembly aligns with the ridges on your drive shaft.

Installing Your Boat Propeller: Step #2

Once your propeller and assembly are back onto the drive shaft, you’re ready to lock your nut back into place. Hand tighten the nut, spinning it clockwise, to save yourself some time before taking your socket or torque wrench to tighten it further. Be sure to keep your 2X4 nearby for this process to act as a stopping mechanism to hold the boat propeller in place and prevent the boat propeller from spinning when tightening the nut.

Installing Your Boat Propeller: Step #3

Once the nut is hand tightened, you may now use a torque wrench to reach the specification of 55 foot pounds of torque. If you don’t have a torque wrench, no need to worry, simply tighten down the nut with your socket. It will need to be pretty snug to avoid coming off when running your outboard. Once the nut is snugly in place, you’ve successfully installed your propeller.

Boat Propeller(1)

Congratulations! You’re now ready to hit the open water!

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For more information on this process, tune in as Jared Reichenberger walks you through removing and installing a boat propeller, step by step in this video from Mercury Marine!


This article was contributed by an ANGLR Expert

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Derek Horner

ABOUT Derek

I am an avid bass fisherman and part of the ANGLR marketing team. I recently graduated from the Pennsylvania State University after being the team captain of the PSU Bass Fishing team for four years. I fish in tournaments nearly every weekend of the fishing season. I love to fish and have devoted my life to constant improvement with big goals to accomplish. I hope to help others improve and increase their knowledge along the way!

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2 replies
  1. Adam Gowerluk
    Adam Gowerluk says:

    I have a ’68 evinrude 18hp that went a bit slow. I have heard changing the prop could help improve speed. I just don’t know what kind of prop to change to.
    I also have a ’74 merc 200 20hp that needs the water pump replaced but I can’t seem to get the lower end off. Any help would be appreciated.

    Reply
    • Derek Horner
      Derek Horner says:

      Hey Adam,

      What pitch is the prop on your 18hp? Depending on it’s holeshot speed, it could very well be due to the pitch of the prop. You could also try switching from a 3 blade to a 4 blade as another attempt to gain some speed. For the 74′ Merc, we recommend talking to your local marina and seeing if their mechanics would have any ideas!

      Reply

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