Suzuki DF15 Water Pump Impeller Replacement
A worn impeller on your 15 hp Suzuki DF15 starves the engine of cooling water and can overheat it in minutes. Below is the water-pump kit we recommend, which DF15 variants it fits, a step-by-step video, and the parts you need to do the job yourself.
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Watch: how to replace it (step by step)
How to replace the water pump impeller on a Suzuki DF15
2013-2020 Suzuki 15HP Outboard Motor Impeller Replacement
Tools Needed
- Flat screwdriver
- Number 12 screwdriver
- Two number 10 screwdrivers
- Magic picks
Safety
- Ensure the motor is turned off and disconnected from the power source before starting any work.
- Be cautious when handling small parts and tools to avoid losing them.
Steps
- Lift the small clicker upwards to separate the top cover from the motor.
- Turn the top cover clockwise to loosen and remove it.
- Remove the four screws under the foot using a number 12 screwdriver.
- Apply pressure to the foot and wiggle it left and right to remove it.
- Remove the four screws securing the impeller housing using a number 10 screwdriver.
- Lift the impeller housing off the motor.
- Inspect the impeller for any defects or damage.
- Remove the impeller from the housing.
- Clean the impeller housing and remove any dust or debris.
- Install the new impeller into the housing, ensuring it is properly aligned with the pin.
- Apply grease to the tips of the impeller and reinstall it into the motor.
- Turn the impeller clockwise to ensure proper seating.
- Apply grease to the housing and reinstall it onto the motor.
- Tighten the four screws securing the housing using a number 10 screwdriver.
- Reinstall the foot by aligning it with the housing and pressing down.
- Reinstall the top cover by turning it counterclockwise until it is secure.
- Test the motor by connecting a hose to the water intake and flushing out any salt or crystals.
- Turn on the motor and allow it to run for a few minutes to ensure proper water flow.
Tips
- Always replace the entire impeller kit when performing a replacement.
- Ensure the impeller is in good condition before installing it.
- Clean the impeller housing thoroughly before reinstalling it.
- Apply grease to the impeller and housing to prevent corrosion and ensure proper sealing.
- Flush the motor with fresh water before testing it to remove any salt or crystals.
Which part do I need for my Suzuki DF15?
For most DF15 owners the part above (89647) is the right choice. Price tip: the aftermarket numbers are usually noticeably cheaper than the OEM-branded box — it is the same physical part. If you need an exact match, these compatible part numbers also fit:
Show all compatible part numbers (8)
| Part number | Description | Fits | |
|---|---|---|---|
| 12152 | Water Pump Service Kit | DF15 (1996–2020) | cross-reference only |
| 15220 | Water Pump Service Kit | DF15A (2013–2025) | cross-reference only |
| 15230 | Water Pump Service Kit | DF15 (1996–2020) | cross-reference only |
| 16750 | Water Pump Cup | DF15A (2013–2025) | cross-reference only |
| 18-3049 | Sierra 18-3049 | DF15 (1996–2020) | Find on Amazon → |
| 18-3099 | Sierra 18-3099 | DF15 (1996–2020) | Find on Amazon → |
| 18-3254 | Sierra 18-3254 | DF15 (1996–2020) | Find on Amazon → |
| 18-3256 | Sierra 18-3256 | DF15 (1996–2020) | Find on Amazon → |
Many of these are the same physical part under different brand numbers. Build years are shown where our parts data has them. Where a variant has no years, only the model code is listed. Confirm against your engine plate before ordering.
Frequently asked questions
What water pump impeller fits a Suzuki DF15 (15 hp)?
The Suzuki DF15 uses the impeller sold as Sierra 18-3049, plus its OEM and aftermarket cross-references (8 compatible numbers are listed above). Confirm the number against your engine's model code and year plate before ordering.
How often should I replace the impeller on a Suzuki DF15?
Replace the water pump impeller every 1-3 years or roughly every 200-300 running hours, whichever comes first — and sooner if you run in silty, sandy or shallow water.
What are the symptoms of a failing impeller on a Suzuki DF15?
A weak or missing telltale stream, engine temperature climbing above normal, or an overheat alarm are the classic warning signs. A worn impeller can overheat and damage the engine within minutes, so don't delay the job.
Do I need the full water pump kit or just the impeller?
For the DF15, fit the complete kit. The seals, O-rings, gasket and wear plate age alongside the impeller, and replacing them together is the reliable, do-it-once job.
How long does a water pump job take on a Suzuki DF15?
For a competent DIYer it's typically a 1-2 hour job of medium difficulty. The step-by-step video above covers every step.
Related guides
- Suzuki DF40 water pump / impeller
- Suzuki DF60 water pump / impeller
- Suzuki DF4 water pump / impeller
- Suzuki DF50 water pump / impeller
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