Yamaha Mariner 40HP Water Pump Impeller 6F5-44352-00 18-3088
17.200.352a
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Yamaha / Mariner 40 HP Water Pump Impeller
Aftermarket impeller replacing Yamaha 6F5-44352-00
Replacement flexible water-pump impeller for selected Yamaha- and Mariner-badged 40 HP two-stroke gearcases that use OEM reference 6F5-44352-00. The previous OMC Cobra claim has been removed because it is not supported by this Yamaha reference.
Key Features
- Aftermarket flexible water-pump impeller
- For selected Yamaha/Mariner 40 HP two-stroke applications
- Neoprene rubber vanes with reinforced hub
- Direct reference replacement for 6F5-44352-00
- One impeller supplied
- Not listed here for OMC Cobra sterndrives
Technical Specs
| Part type | Flexible water-pump impeller |
| Material | Neoprene rubber with rigid hub |
| Engine type | Selected 40 HP two-stroke outboards |
| Supply | 1 impeller |
| 4Boats SKU | 17.200.352a |
Compatibility / Fitment Guide
| Application | Verified fitment | Checks / exclusions |
|---|---|---|
| Yamaha 40 (6H6 family) | Selected 1991–1992 applications using 6F5-44352-00 | Check exact model suffix |
| Yamaha CV40 (6R6 family) | Selected 1990–1994 applications | Verify lower-unit diagram |
| Yamaha C40 | Selected early-1990s models only where 6F5-44352-00 is listed | Not universal across all C40 years |
| Mariner 40 HP Yamaha-built models | Applications cross-referencing 99971M / 6F5-44352-00 | Confirm manufacturer family and serial number |
| OMC Cobra stern drives | Not supported by the Yamaha 6F5 reference | Do not order from the previous description |
Before ordering: Match engine model/serial, lower-unit family and OEM impeller reference. Compare diameter, depth, shaft bore and key arrangement before installation.
Part Number Cross Reference
| Yamaha OEM | 6F5-44352-00; 6F5-44352-00-00 |
| Mariner | 99971M |
| Sierra | 18-3088 |
| Mallory | 9-45606 |
| 4Boats SKU | 17.200.352a |
Frequently Asked Questions
Does this fit every Yamaha 40 HP?
No. It fits selected 6H6/6R6 and related applications using 6F5-44352-00.
Is it for OMC Cobra sterndrives?
No supported cross-reference was found; that claim has been removed.
Is only the impeller included?
Yes. Gaskets, key, wear plate and pump housing are not included unless shown.
How often should it be replaced?
Follow the engine service schedule and replace sooner after dry running, sand ingestion, weak tell-tale flow or overheating.
Installation note: Never run the impeller dry. Lubricate with soapy water or the manufacturer-approved assembly lubricant, turn the driveshaft in its normal direction while installing the housing, and replace damaged pump components.
For the products under £150 the shipping is £6.99.
Free delivery for most items over £150.
