Mercury Tracker 25EL Water Pump Repair

When the water pump fails on a Mercury outboard, the impeller is usually to blame. 

Watch the video above and follow the steps below to replace the impeller and repair the water pump on a Mercury Tracker 25 outboard.

NOTE: We worked on a Mercury Tracker 25EL, but the method for repairing the water pump is the same or similar for most outboard motors.

Tools and Parts Needed – Mercury Tracker 25 Water Pump Repair

Tools

  • Ratchet
  • 10mm socket

Mercury Tracker 25EL water pump repair kit

How to Replace Mercury Tracker 25 Water Pump

To access the water pump, you’ll need to remove the gearcase/lower unit from the outboard. Watch our Mercury Tracker 25 lower unit removal video below for reference.

Step 1. Pry the rubber bushing from the top of the water pump assembly, and remove it by sliding it up and off the driveshaft.

Mercury Tracker 25 water pump housing

Step 2. Remove the four 10mm bolts from the water pump assembly, followed by the water pump housing.

Step 3. Remove the impeller and the nylon washers above and below it.

Mercury 25 water pump impeller replacement

Step 4. Remove the woodruff key from the base of the driveshaft.

Step 5. Pry the wear plate and the gasket beneath it from the gearcase and remove them.

Watch the clip below to see the water pump disassembly segment of our Mercury Tracker 25 water pump repair video.

Step 6. Install the new gasket and wear plate (both included in the water pump kit) and apply a thin film of PTFE marine grease to the plate.

Mercury Tracker 25 water pump parts diagram

Step 7. Install the new woodruff key (included in the water pump kit) using a dab of PTFE marine grease to hold it in place.

Mercury Tracker 25 water pump repair

Step 8. Install the new impeller with one new nylon washer above it and another beneath it (all included in the water pump kit).

Mercury 25 outboard water pump impeller

Step 9. Install the new O-ring into the new water pump housing (both included in the water pump kit) and lightly smear the inside of the housing with PTFE marine grease.

Mercury 25 outboard water pump housing

Step 10. Install the new water pump housing while rotating the driveshaft clockwise. This ensures the impeller’s blades are turned in the correct direction within the housing.

Mercury Tracker 25 water pump replacement

Step 11. Reinstall the four 10mm water pump assembly bolts.

Step 12. Install the new rubber bushing on top of the water pump housing, and the new water pipe sleeve into the water pump housing (both included in the water pump kit).

Watch the clip below to see the water pump reassembly segment of our Mercury Tracker 25 water pump repair video.

After repairing the water pump, you’ll need to remount the lower unit to the outboard. Watch our Mercury Tracker 25 lower unit reinstall video below to see how it’s done. 

 
PUMP KIT-WATER
Mercury

PUMP KIT-WATER

Qty.
LUBE-2 4 C @12
Mercury

LUBE-2 4 C @12

Qty.

 

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