Water Pump Impeller – Fits Mercury/Mariner 6–15 HP and Select Chrysler Force 9.9/15 HP Models (Replaces 47-42038Q02, 47-420381, 47-420382, 47-42038-2, Sierra 18-3062)
Water Pump Impeller – Fits Mercury/Mariner 6–15 HP and Select Chrysler Force 9.9/15 HP Models (Replaces 47-42038Q02, 47-420381, 47-420382, 47-42038-2, Sierra 18-3062) is backordered and will ship as soon as it is back in stock.
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Water Pump Impeller – Fits Mercury/Mariner 6–15 HP and Select Chrys...
Water Pump Impeller – Fits Mercury/Mariner 6–15 HP and Select Chrysler Force 9.9/15 HP Models (Replaces 47-42038Q02, 47-420381, 47-420382, 47-42038-2, Sierra 18-3062) is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket water pump impeller is a replacement component for selected Mercury and Mariner outboards from 6 through 15 HP, including applications identified by the OEM reference 47-42038Q02. Catalog records also identify this impeller reference for selected 4-stroke models and specific serial-number ranges, so verify the complete engine identification before ordering.
The impeller is also listed for a specific Chrysler Force 9.9/15 HP application from 1998 with serial numbers E288600–E344999. It is not a universal fit for every engine within a horsepower range.
- Aftermarket replacement for the water pump impeller in compatible outboard cooling systems.
- High-volume, long-vane impeller style identified in aftermarket catalog references.
- Approximate outside diameter: 2.3125 inches (58.8 mm).
- Approximate inside diameter: 0.500 inch (12.7 mm).
- Impeller only; the drive key is not included unless specifically supplied with the product package.
Part Number Matrix
Use the references below to compare the part removed from your engine. Part-number interchange does not replace verification of the engine model, stroke, serial number, and water-pump design.
| Brand or Source | Part Number | Reference |
|---|---|---|
| Mercury Marine | 47-42038Q02 | OEM reference |
| Mercury Marine | 47-420381 | Replacement reference |
| Mercury Marine | 47-420382 | Replacement reference |
| Chrysler Force | 47-42038-2 | Replacement reference |
| Sierra | 18-3062 | Aftermarket interchange reference |
Engine & Model Compatibility
The catalog relationships below are kept with their stated horsepower, stroke, and serial conditions. A general horsepower match alone is not confirmation of fitment.
| Brand | Model or Application | Rated HP | Stroke | Serial or Year Condition | OEM Reference |
|---|---|---|---|---|---|
| Mercury | Outboard | 6 | Not specified in catalog occurrence | 0A197112–0D280999; 0D281000–0G760299; 0G760300–0T800999; 9461526–9792199; 9792200–0P016999; 0P017000–0P325499; 0P325500 and up | 47-42038Q02 |
| Mercury | Outboard | 8 | Not specified in catalog occurrence | 0A197112–0D280999; 0D281000–0G760299; 0G760300–0T979999; 0T980000–0T999999; 1B000001 and up | 47-42038Q02 |
| Mercury | Outboard | 8 | 4-Stroke | Selected serial ranges including 0P325500 and up, 0H000058 and up, and 0P086824–0P400999 | 47-42038Q02 |
| Mercury | Outboard | 9.9 | Not specified in catalog occurrence | 0A197112–0D280999; 0D281000–0G760299; 0G760300–0T979999; 0T980000–0T999999; 1B000001 and up | 47-42038Q02 |
| Mercury | Outboard | 9.9 | 4-Stroke | Selected serial ranges including 0P325500 and up, 0H000058–0H016909, 0G760300–1B226999, and 0P075166–0P400999 | 47-42038Q02 |
| Mercury | 10 Sea Pro | 10 | Not specified in catalog occurrence | 0D038000–0D279999; 0D281000–0G760299; 0G760300–0T979999; 0T980000–0T999999; 1B000001 and up | 47-42038Q02 |
| Mercury | 10 Viking | 10 | Not specified in catalog occurrence | 0P017000–0P325499 and 0P325500 and up | 47-42038Q02 |
| Mercury | 15 Sea Pro, Viking, and related applications | 15 | Not specified in catalog occurrence | Selected serial ranges including 0G044365–0G437999, 0G438000–0G760299, 0G760300–0T979999, 0T980000–0T999999, and 1B000001 and up | 47-42038Q02 |
| Mercury | 15 Outboard | 15 | 4-Stroke | Selected serial ranges including 0G590000–0G760299, 0G760300–1B226999, 1B227000–1B727495, 0P075166–0P400999, and 0P401000 and up | 47-42038Q02 |
| Chrysler Force | 9.9/15 HP application | 9.9–15 | Not specified in catalog occurrence | 1998; serial E288600–E344999 | 47-42038-2 |
Technical Specs
- Product Type
- Water pump impeller
- Impeller Style
- High-volume / long-vane design
- Outside Diameter
- Approximately 58.8 mm (2.3125 in)
- Inside Diameter
- Approximately 12.7 mm (0.500 in)
- Included Key
- No; verify the original key and reuse or replace it separately as required
What’s in the Box
- 1 x Water Pump Impeller
Important: The drive key is not included with this impeller. Confirm that your existing key is serviceable and that its dimensions match the pump and shaft before installation.
Installation Notes
Installation should be performed with the engine stopped, disconnected from its starting source, and supported according to the manufacturer's service procedure. Remove the old impeller, inspect the pump housing, wear plate, cover, drive key, and shaft for damage or wear, and replace damaged parts before assembly.
Install the impeller in the correct rotational orientation for the engine. Lightly wetting the impeller and pump housing with clean water or an approved water-pump assembly lubricant can help prevent dry-start damage. Do not run the engine without adequate cooling-water supply, and verify a strong cooling-water tell-tale stream after installation.
Troubleshooting & FAQ
How do I confirm this impeller fits my motor?
Check the engine brand, exact model, horsepower, stroke, serial number, and water-pump design. Then compare the original impeller and its part number with the compatibility information and reference matrix above. If any of these details differ, consult the engine manufacturer's parts catalog before ordering.
What are the signs of a worn-out impeller?
Possible symptoms include overheating, a weak or missing tell-tale stream, reduced cooling-water flow, or visible cracks, brittleness, deformation, or missing vane material. A damaged or melted pump housing should also be inspected and corrected.
How often should an impeller be replaced?
Replacement timing depends on use, storage, water conditions, and the engine manufacturer's maintenance schedule. Inspect the impeller during scheduled water-pump service and replace it sooner if the engine has been operated in sand, silt, saltwater, or after an overheating event.
Does this listing include the drive key?
No. This listing is for one impeller only. Catalog references for this impeller identify the key as a separate component, so inspect your original key and obtain the correct replacement separately if needed.
Is this an OEM part?
No. This is an aftermarket replacement impeller designed to replace the listed OEM and aftermarket reference numbers. Mercury, Mariner, Chrysler, Force, and Sierra are trademarks of their respective owners.
Can this impeller be used on every Mercury or Force engine from 6–15 HP?
No. The same reference appears across specific models and serial ranges, but not every engine in the stated horsepower range. Confirm the complete model and serial information before purchase.
Safety & Important Info
- Verify the exact engine model, stroke, serial number, water-pump design, and original part number before ordering.
- Compare the impeller dimensions and key arrangement with the original component.
- This is an aftermarket replacement, not an OEM component.
- Stop operation immediately if the engine overheats or the cooling-water stream is weak or absent.
- Professional installation is recommended when servicing the lower unit or water pump.
About Sea Sierra
- Pro-Grade Standards — We supply marine replacement parts selected for demanding real-world service conditions.
- Fast Global Fulfillment — Standard and expedited delivery options are shown at checkout where available.
- Manufacturer-Direct Value — Practical aftermarket solutions for routine marine maintenance and repair.
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