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Crowley Marine: serving boaters for over 40 years Crowley Marine: serving boaters for over 40 years
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Replacing An Outboard Water Pump

Crowley Marine

As a general rule of thumb, the water pump impeller should be replaced every other season. A water pump repair kit is available for almost all outboard models. For steps requiring lubrication use BRP Triple-Guard Marine Grease or Mercury 2-4-C Marine Lubricant.

  1. Shift your motor into reverse gear
  2. Remove the bolts that attach the lower unit to the midsection
  3. Disconnect the shift rod
  4. * Not all shift rods disconnect in the same way. Some disconnect up by the powerhead, some disconnect below the swivel bracket, and some disconnect above the gearcase.
  5. Remove the lower unit
  6. Remove the bolts on the water pump housing
  7. Remove the water pump housing and impeller from gearcase
  8. Also remove the wear plate and gaskets from the gearcase
  9. Install new water pump wear plate and gaskets on gearcase
  10. Lubricate impeller cup, keyway, and driveshaft
  11. Install impeller so that it lines up with impeller key
  12. Install water pump housing
  13. * Turn driveshaft as you place the housing on top of the impeller. You will turn the driveshaft clockwise for standard (right hand) rotation models

  14. Tighten housing bolts in crisscross pattern to assure proper gasket sealing.
  15. Place new water tube seal in water pump housing
  16. Line up driveshaft, water tube, and shift rod while installing lower unit
  17. Lubricate and install bolts that attach lower unit to the midsection
  18. * You may need to connect the shift rod before bolting up the lower unit

  19. Run motor with flusher to make sure the tell tale stream is constant

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