Mercury Tracker 25EL Lower Unit Removal

If you’re a newcomer to servicing outboards, one of the first things you should learn how to do is remove the lower unit. 

Knowing how to remove an outboard’s lower unit is often necessary to repair and/or replace parts such as the water pump impeller, which is something that should be done at least once a year. 

Watch the video above and follow the steps below to learn how to remove the gearcase on a Mercury Tracker 25EL. 

NOTE: We removed the gearcase on a Mercury Tracker 25EL, but the method is the same or similar for most makes and models of outboard motor. 

Mercury Tracker outboard lower unit removal

NOTE: The method for removing the Tracker 25 Mercury outboard lower unit is the same or similar for any make or model of outboard. 

Tools Needed - Mercury Tracker 25 Lower Unit Removal

  • Ratchet and sockets
  • Flat-blade screwdriver

How to Remove the Gearcase/Lower Unit From an Outboard

Step 1. Remove the top cowling.

Mercury outboard lower unit removal

Step 2. Remove the two bolts holding the starter and the wire leading to the starter solenoid, followed by the starter itself.

Outboard lower unit removal Mercury

Step 3. Pry the retaining clip off the shift shaft retaining pin with a flat-blade screwdriver and remove the pin.

Mercury 25HP outboard lower unit removal

Step 4. Support the lower unit to prevent it from suddenly dropping, then remove the four 16mm lower unit mounting bolts.

Mercury Tracker outboard lower unit removal

Step 5. Carefully slide the lower unit away from the outboard — being careful not to damage the drive shaft or the shift shaft  and you’re done.

Mercury Tracker outboard lower unit removal

So now that you have the lower unit removed on your Mercury Tracker 25 outboard, what next? As mentioned before, one of the repairs that can be done by removing the lower unit is replacing a water pump impeller, or simply repairing the water pump altogether. 

Watch the video above to see how to repair the water pump on a Mercury Tracker 25 outboard. 



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