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Outboard Water Pump Impeller Repair Kit for 40HP 50HP 60HP 63D-W0078
Outboard Water Pump Impeller Repair Kit for 40HP 50HP 60HP 63D-W0078
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Product Overview
This outboard water pump impeller repair kit is designed as a replacement cooling system service kit for compatible 40HP, 50HP, and 60HP 2-stroke and 4-stroke outboard engines using OEM part number 63D-W0078 or Sierra 18-3415.
The water pump impeller helps circulate cooling water through the outboard engine to maintain proper operating temperature. A worn, cracked, or damaged impeller may cause weak cooling water flow, overheating, reduced engine performance, or serious engine damage during marine use.
Built for harsh marine environments, this repair kit is suitable for routine outboard cooling system maintenance or replacing worn water pump components. Please compare the part number, impeller size, housing size, O-ring diameter, bolt dimensions, gasket shape, and product photos with your original parts before ordering.
Product Compatibility
| Engine Type | Compatible Application |
|---|---|
| 2-Stroke Outboard Engine | Compatible 40HP / 50HP / 60HP applications |
| 4-Stroke Outboard Engine | Compatible 40HP / 50HP / 60HP applications |
| OEM Part Number | 63D-W0078 |
| Sierra Cross Reference | 18-3415 |
| Marine Outboard Motor | Water pump impeller repair and cooling system maintenance |
⚠️ Please confirm your original water pump repair kit part number is 63D-W0078 or Sierra 18-3415 before purchase.
Specifications
| Item | Details |
| Product Type | Outboard Water Pump Impeller Repair Kit |
| OEM Part Number | 63D-W0078 |
| Cross Reference | Sierra 18-3415 |
| Compatible Engine Type | 2-Stroke / 4-Stroke Outboard Engines |
| Compatible Horsepower | 40HP / 50HP / 60HP |
| Housing Inner Diameter | 20mm / 0.79" |
| Impeller Inner Diameter | 18mm / 0.71" |
| O-Ring Diameter | 63mm / 2.5" |
| Bolt Length | 35mm / 1.4" |
| Bolt Diameter | 7mm / 0.28" |
| Application | Outboard cooling water pump repair |
| Condition | 100% Brand New |
Key Features
- Water pump impeller repair kit for compatible 40HP, 50HP, and 60HP outboard engines
- Replaces OEM 63D-W0078 and cross-references Sierra 18-3415
- Suitable for selected 2-stroke and 4-stroke outboard applications
- Helps restore cooling water flow and reduce overheating risk
- Built for durability in marine, water, moisture, and outdoor operating conditions
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Fitment FAQ
Will this part fit my specific model and year?
This outboard water pump impeller repair kit may fit compatible 40HP, 50HP, and 60HP 2-stroke or 4-stroke outboard engines using OEM part number 63D-W0078 or Sierra 18-3415. Fitment depends on the original part number, water pump housing, impeller size, O-ring size, and bolt dimensions rather than horsepower alone.
Do I need to match the OEM part number?
Yes. For this water pump repair kit, matching the part number is strongly recommended. Please confirm that your original kit matches 63D-W0078 or Sierra 18-3415 before ordering.
What models or situations does this part not fit?
This kit may not fit outboard engines with different horsepower ratings, different water pump housing designs, different impeller inner diameter, different O-ring size, different bolt size, or a different cooling pump structure. It is not recommended if your original part number does not match 63D-W0078 or Sierra 18-3415.
What should I check before ordering?
Before ordering, check your outboard engine horsepower, engine type, original part number, housing inner diameter, impeller inner diameter, O-ring diameter, bolt length, bolt diameter, gasket shape, and product photos. Make sure your original water pump components match this 63D-W0078 repair kit.