Sierra 18-3319 Water Pump Repair Kit Mercury 105 110 Jet 150HP
18-3319
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Sierra 18-3319 Water Pump Kit
Complete cooling-system service components
The Sierra 18-3319 water pump repair kit brings together the impeller, housing, gaskets, O-rings and associated service components required for selected Mercury applications. Replacing worn pump parts helps restore cooling-water flow and reduce overheating risk.
Key Features
- ✔ Genuine Sierra-branded aftermarket service kit
- ✔ Includes Sierra 18-3017 impeller
- ✔ Includes water-tube guide and pump housing
- ✔ Multiple gaskets, seal ring and O-rings included
- ✔ For selected Mercury two-stroke Jet and V6 applications
Technical Specs
| Brand | Sierra |
| Kit number | 18-3319 |
| Impeller | 18-3017 / Mercury 47-89984 |
| Water-tube guide | 18-3109 / Mercury 23-29804 |
| Housing | 18-3116 |
| Kit type | Water pump repair kit |
Compatibility / Fitment Guide
Listed for selected Mercury 105 Jet applications (approximately 1993–1998) using a 150HP two-stroke six-cylinder powerhead and selected Mercury 110 Jet 2.5L two-stroke applications. Verify the complete pump-kit reference and engine serial number before ordering.
Part Number Cross Reference
| Sierra | 18-3319 |
| Mercury | 46-42579A4; 46-96148A8 |
| Mallory | 9-48306 |
| Impeller reference | 47-89984 / Sierra 18-3017 |
This is a genuine Sierra aftermarket kit, not a Mercury-branded component.
Questions & Answers
Is this a genuine Mercury kit?
No. It is a genuine Sierra aftermarket service kit.
Is the impeller included?
Yes. The listed kit includes Sierra impeller 18-3017 plus associated pump components.
Does it fit all Mercury 150HP engines?
No. Check the pump-kit number and serial-number-specific parts diagram.
Should every gasket be replaced?
Use the applicable new gaskets and seals supplied for your pump configuration, following the workshop manual.
Note: Water-pump service should follow the engine workshop manual; incorrect assembly can cause loss of cooling water.
For the products under £150 the shipping is £6.99.
Free delivery for most items over £150.
