Mercury Tracker 25EL Lower Unit Removal

If you’re new to servicing outboards, you should learn how to remove the lower unit. Removing an outboard’s lower unit is often necessary to repair and/or replace parts such as the water pump impeller.

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

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

Buy OEM Mercury 25 outboard parts

Buy OEM Mercury outboard parts

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

Outboard lower unit removal Mercury Tracker 25EL

Outboard lower unit removal Mercury Tracker 25HP

Outboard lower unit removal Mercury 25HP

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 25EL 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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