How to Install an Impeller on a Force Outboard Motor

by Cameron Easey

Outboard motors use water that comes in through the water intake to keep the engine cool when it is running. The water is brought into the outboard through the use of an impeller that draws water into the water intake opening on the midsection of the outboard. The impeller may need to be replaced if the engine is not running properly. You can install an impeller on a Force outboard motor by first accessing the impeller pump housing.

Removing the Pump Housing

Step 1

Remove the bolts that secure the lower drive unit to the midsection of the outboard by using a socket wrench. Depending on the model of the motor there may be four or five bolts that you will need to remove.

Step 2

Tap on the lower drive unit to loosen it with a rubber mallet. Tapping the lower drive unit will make it easier to pull out.

Step 3

Pull out the lower drive unit until the drive shaft is clear of the midsection and set it on the ground.

Step 4

Remove the bolts or nuts that are securing the impeller pump housing to the lower drive unit with a wrench.

Pull the impeller pump housing up off of the drive shaft. If the housing appears stuck, use a screwdriver to gently pry up the housing to loosen it.

Installing the Impeller

Step 1

Take the old impeller out of the impeller pump housing if it did not already fall out.

Step 2

Apply grease to the impeller key so that it does not fall out of the drive shaft. The impeller key is a pin or small piece of metal that is located at the base of the drive shaft.

Step 3

Lubricate the impeller and the inside of the impeller pump housing and then slide the impeller down the drive shaft.

Step 4

Slide the impeller pump housing down the drive shaft and secure it,. using the wrench, with the bolts or nuts.

Reinstall the lower drive unit to the outboard to complete the project.


  • Trim the outboard all the way up if you have the boat on a trailer out of the water.
  • You can purchase an impeller from most any marine supply store.


  • Failure to apply grease to the inside of the impeller pump housing and the impeller can create friction that may cause the impeller to seize up.

Items you will need

  • Socket wrench
  • Wrench
  • Rubber mallet
  • Screwdriver
  • Impeller
  • Grease Gun

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