Suzuki DF40 Water Pump Impeller Replacement
A worn impeller on your 40 hp Suzuki DF40 starves the engine of cooling water and can overheat it in minutes. Below is the water-pump kit we recommend, which DF40 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 DF40
YAMAHA 40 HP IMPELLER CHANGE / GEAR OIL Service, , SUZUKI DT 40 first inspection ?
Tools Needed
- Screwdriver
- Compressor
- Vaseline
Safety
- Ensure the engine is cool before starting any work.
- Be cautious with the spark plugs as they are loose.
Steps
- Remove the water pump housing from the Suzuki DT 40 engine.
- Inspect the impeller; if it is worn down, replace it with a new one.
- Clean the area where the impeller was located.
- Apply a small amount of Vaseline to the impeller before reinstalling it.
- Reinstall the impeller, ensuring it fits flush in the housing.
- Reattach the water pump housing to the engine.
- Perform a gear oil change and replace the zinc tab.
Tips
- Use a compressor to clean any debris or residue from the engine.
- Be mindful of the spark plugs, as they are loose and may need tightening.
- If the motor is old, consider replacing it with a newer model for better performance.
Which part do I need for my Suzuki DF40?
For most DF40 owners the part above (89610) 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 (17)
| Part number | Description | Fits | |
|---|---|---|---|
| 15240 | Water Pump Service Kit | DF40 (1999–2010) | cross-reference only |
| 15250 | WATER PUMP SERVICE KIT | DF40 (1999–2010) | cross-reference only |
| 15260 | Water Pump Service Kit | DF40A (2011–2025) | cross-reference only |
| 15270 | WATER PUMP SERVICE KIT | DF40A (2011–2025) | cross-reference only |
| 17461-90J00 | Impeller / water-pump component | DF40 (1999–2010) | Find on Amazon → |
| 17461-90J01 | Impeller / water-pump component | DF40 (1999–2010) | Find on Amazon → |
| 17461-94500 | Impeller / water-pump component | DF40 (1999–2010) | Find on Amazon → |
| 17461-94501 | Impeller / water-pump component | DF40 (1999–2010) | Find on Amazon → |
| 17461-94511 | Impeller / water-pump component | DF40 (1999–2010) | Find on Amazon → |
| 17461-94520 | Impeller / water-pump component | DF40 (1999–2010) | Find on Amazon → |
| 18-3023 | IMPELLER | DF40 (1999–2010) | Find on Amazon → |
| 18-3035 | IMPELLER | DF40 (1999–2010) | Find on Amazon → |
| 18-3096 | Sierra 18-3096 | DF40 (1999–2010) | Find on Amazon → |
| 18-3242 | Sierra 18-3242 | DF40 (1999–2010) | Find on Amazon → |
| 18-3253 | Sierra 18-3253 | DF40 (1999–2010) | Find on Amazon → |
| 18-3264 | Sierra 18-3264 | DF40 (1999–2010) | Find on Amazon → |
| 89628 | IMPELLER | DF40 (1999–2010), DF40A (2011–2025) | cross-reference only |
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 DF40 (40 hp)?
The Suzuki DF40 uses the impeller sold as Sierra 18-3023, plus its OEM and aftermarket cross-references (17 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 DF40?
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 DF40?
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 DF40, 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 DF40?
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 DF60 water pump / impeller
- Suzuki DF4 water pump / impeller
- Suzuki DF50 water pump / impeller
- All Suzuki water pump guides
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