Suzuki DF50 Water Pump Impeller Replacement
A worn impeller on your 50 hp Suzuki DF50 starves the engine of cooling water and can overheat it in minutes. Below is the exact water-pump kit that fits this engine, 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 Impeller – Suzuki DF50AP
2006 Suzuki DF50 Impeller, Shift Linkage and Propeller Installation
Tools Needed
- 12mm socket wrench
- 10mm socket wrench
- Screwdriver
- Pliers (for cotter pin)
- WD-40
- Silicone grease
- Scotch-Brite pad
- Knife (for gasket removal)
Safety
- Ensure the engine is cool before starting work.
- Be cautious when handling sharp tools.
Steps
- Remove the propeller by unscrewing the six bolts underneath the cavitation plate and one bolt underneath the propeller.
- Remove the cotter pin and washer from the propeller shaft using pliers.
- Mark the position of the propeller shaft with a pencil to ensure proper reassembly.
- Undo the shift linkage coupling using two 10mm wrenches.
- Remove the bonding strap from the shift linkage.
- Carefully pull the entire lower unit off the engine shaft.
- Take the lower unit to a shop or workbench to clean and disassemble further.
- Use a 10mm socket wrench to remove the four nuts from the pump housing.
- Gently pry the pump housing off using a screwdriver, being careful not to damage the gasket.
- Remove the impeller, taking note of the Woodruff key and its position.
- Clean the impeller housing and shaft using a Scotch-Brite pad.
- Remove the old gasket and base plate using a knife.
- Clean the surface around the studs to ensure a clean fit for the new gasket and base plate.
- Install the new gasket and base plate, ensuring they are dry and properly aligned.
- Grease the inside of the impeller housing and the impeller veins with silicone grease.
- Install the Woodruff key in the top of the impeller housing.
- Grease the spline of the impeller and install the impeller, ensuring the slot is at the top.
- Reassemble the lower unit onto the engine shaft, ensuring proper alignment.
- Reattach the shift linkage coupling and bonding strap.
- Reinstall the propeller, washer, and cotter pin, ensuring the propeller is properly aligned with the mark made earlier.
Tips
- Cleaning the impeller housing and shaft with a Scotch-Brite pad can help remove mineral deposits and make reassembly easier.
- Greasing the impeller and impeller housing with silicone grease can help prevent future issues.
- Paying close attention to the position of the Woodruff key and the impeller during disassembly and reassembly is crucial for proper function.
Which part do I need for my Suzuki DF50?
For most DF50 owners the part above (15240) 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 | |
|---|---|---|
| 15250 | WATER PUMP SERVICE KIT | Find on Amazon → |
| 15260 | Water Pump Service Kit | Find on Amazon → |
| 15270 | WATER PUMP SERVICE KIT | Find on Amazon → |
| 15290 | WATER PUMP SERVICE KIT | Find on Amazon → |
| 16730 | WATER PUMP CUP | Find on Amazon → |
| 89380 | IMPELLER | Find on Amazon → |
| 89610 | Impeller | Find on Amazon → |
| 89628 | IMPELLER | Find on Amazon → |
Many of these are the same physical part under different brand numbers. Confirm against your engine plate before ordering.
Frequently asked questions
What water pump impeller fits a Suzuki DF50 (50 hp)?
The Suzuki DF50 uses the impeller sold as 15240, 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 DF50?
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 DF50?
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 DF50, 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 DF50?
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 DF15 water pump / impeller
- Suzuki DF40 water pump / impeller
- Suzuki DF60 water pump / impeller
- Suzuki DF4 water pump / impeller
- All Suzuki water pump guides
- Free Suzuki boat valuation
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