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Removing Outboard Lower Unit

Updated on August 6, 2016

Removing the Outboard Lower Unit

Once a used outboard has been purchased, it’s time to clean it up and decide how much work it is going to take to get the motor running again. At any point in time during these steps, one may decide that the motor is not worth repair and may be best used as a parts motor. During this process, it is a good idea to take pictures along the way so that it will be easier to put things back together. The following steps apply to a 1954 Wizard WG4 Super Twin outboard motor, but they are all very similar.

Pull The Propeller

Pull the cotter pin from the propeller shaft. This pin is used to hold the propeller nut in place. Unscrew the propeller nut. At this point, the propeller should slide off of the shaft. Beneath the propeller is the clutch. The clutch should slide off of the shaft as well. At this point, the shaft should be visible along with a retainer clip holding the impeller and associated contents in place.

Lower Brass Screw
Lower Brass Screw | Source
Upper Screw
Upper Screw | Source
Remove Lower Unit Assy
Remove Lower Unit Assy | Source
Remove Cotter Pin
Remove Cotter Pin | Source
Remove Nut
Remove Nut | Source
Remove Prop
Remove Prop | Source
Remove Clutch
Remove Clutch | Source
Remove Retainer Clip
Remove Retainer Clip | Source
Remove Pin
Remove Pin | Source
Exposed Impeller
Exposed Impeller | Source
Parts Laid Out
Parts Laid Out | Source

Remove Screws

There are usually two screws in the lower unit. One will be at the lowest point possibly made out of brass. The other will be at a higher point on the opposite side. These holes are used to fill the lower unit with grease or oil. When removing these screws.

Remove Lower Unit

Remove the lower unit prop assembly by removing the two screws that hold it in place. Once these screws are removed, the lower unit assembly should slide off the leg of the motor. There will be an old seal in between the assembly that has been removed and the lower portion of the leg. This seal should be saved so that a new seal can be made or purchased for later use.

Remove Shaft and Impeller

Remove the retainer clip with a pair of needle nose pliers. Remove the pin that goes through the shaft. This pin usually needs to be driven out by aligning it with the cut-out in the housing and driving it out with a small nail or punch. Once removed, the retaining hub can be removed. This will expose the impeller. Remove the gear shaft and impeller. Lay out all the parts on a towel and start to clean them up with a rag and mild cleaner. Be careful not to damage any seals.


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