Suzuki DF6 Water Pump Impeller Replacement
A worn impeller on your 6 hp Suzuki DF6 starves the engine of cooling water and can overheat it in minutes. Below is the water-pump kit we recommend, which DF6 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 DF6
SUZUKI DF 6HP IMPELLER REPLACE
Tools Needed
- 10mm and 12mm spanners
- Flathead screwdriver
- Torch (for better visibility)
- RTV or gasket glue
- New impeller kit
Safety
- Ensure the engine is cool before starting any work.
- Be careful when handling the gear linkage to avoid losing any small parts.
Steps
- Undo the gear linkage nut slightly to allow the gear change to drop off.
- Remove the housing by undoing the two nuts underneath it.
- Inspect the impeller for signs of wear and decide if it needs replacing.
- Clean the housing and any other parts that will be reused.
- Apply RTV or gasket glue to the bottom gasket and place it on the casing.
- Place the new gasket on top of the RTV, ensuring it is correctly aligned.
- Apply a small amount of RTV to the top of the new gasket.
- Place the impeller case onto the gasket, ensuring it is properly seated.
- Insert the new impeller and Woodruff key into the impeller case.
- Slide the lock-in housing into place, ensuring it is properly seated.
- Replace the knock pin and four washers.
- Tighten the housing bolts in a sequence, ensuring they are not overtightened.
Tips
- When tightening the housing bolts, do them in opposites to ensure the housing is not skewed.
- Be gentle when tightening the housing bolts, as overtightening can cause damage.
- Make sure the gear linkage is properly lined up before reassembling the engine.
- Test the engine after reassembly to ensure it engages gears and runs properly.
Which part do I need for my Suzuki DF6?
For most DF6 owners the part above (15210) 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 (5)
| Part number | Description | Fits | |
|---|---|---|---|
| 12316 | Impeller | DF6 (2003–2016), DF6A (2017–2020) | cross-reference only |
| 18-3095 | Sierra 18-3095 | DF6 (2003–2016) | Find on Amazon → |
| 18-3097 | Sierra 18-3097 | DF6 (2003–2016) | Find on Amazon → |
| 18-3266 | Sierra 18-3266 | DF6 (2003–2016) | Find on Amazon → |
| 89516 | Impeller | DF6 (2003–2016), DF6A (2017–2020) | 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 DF6 (6 hp)?
The Suzuki DF6 uses the impeller sold as Sierra 18-3095, plus its OEM and aftermarket cross-references (5 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 DF6?
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 DF6?
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 DF6, 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 DF6?
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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