Sierra 47-3248 Impeller for Honda Outboard Engines
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Sierra Marine Impeller 18-3248
Product Description
The Sierra Marine 18-3248 Impeller is a replacement raw water pump impeller for compatible Honda outboard engines. It is designed to replace the Honda water pump impeller used in select mid-range outboard cooling systems, helping maintain proper water flow through the lower unit and engine cooling passages.
This impeller is commonly cataloged under Sierra’s part family as 47-3248 and is used where the Honda parts lookup calls for 19210-ZV5-003.
Key Features
- Sierra Marine replacement water pump impeller.
- Part number: 18-3248.
- Sierra catalog / supplier reference: 47-3248.
- Designed for compatible Honda outboard engines.
- Replaces Honda 19210-ZV5-003.
- Supports proper raw water cooling flow through the outboard.
- Recommended during water pump service, overheating diagnosis, or lower unit maintenance.
- Helps protect the engine from overheating caused by worn or damaged impeller vanes.
Honda Outboard Compatibility
Common application context includes compatible Honda outboard engines in the following horsepower range where 19210-ZV5-003 or Sierra 18-3248 / 47-3248 is specified:
- Honda 35 HP outboards.
- Honda 40 HP outboards.
- Honda 45 HP outboards.
- Honda 50 HP outboards.
Use this impeller only where the engine model, year, serial number, lower unit water pump design, and parts manual confirm compatibility.
Serial Number Fitment Notice
Honda outboard water pump parts can vary by model year, lower unit design, and serial number range. Always verify the existing impeller number, engine model, and Honda parts diagram before ordering.
This listing is for the impeller only. If the pump housing, wear plate, key, cup, seals, or gaskets are worn, a complete water pump repair kit may be required instead of an impeller-only replacement.
When This Part Needs Replacement
Replace the impeller if the engine has weak telltale flow, overheating, steam at the exhaust, alarm activation, reduced cooling performance, or inconsistent water discharge.
Replacement is also recommended if the impeller blades are cracked, stiff, swollen, missing, permanently bent, or heat-damaged. Outboard impellers should also be replaced during regular water pump maintenance, especially after dry running, sand ingestion, long storage, or use in shallow or silty water.
Installation Notes
Remove the lower unit according to the Honda service procedure and inspect the full water pump assembly before installing the new impeller. Check the pump cup, wear plate, housing, key, seals, and gaskets for scoring, corrosion, grooves, or heat damage.
Lubricate the impeller before installation with water, glycerin, or approved impeller lubricant. Do not install dry. Make sure the impeller key is seated correctly and the vanes are turned in the proper direction as the pump housing is installed. After reassembly, run the engine with proper water supply and confirm strong cooling water discharge.
Alternate / Cross-Reference Part Numbers
- Sierra Marine 18-3248 — primary part number
- Sierra 47-3248 — catalog / supplier reference
- Honda 19210-ZV5-003 — OEM cross-reference reference; verify by model and serial number
- SIE18-3248 — common Sierra catalog format
- SIE 3248 — common distributor format
Parts Desk Insight
This is the common Sierra replacement impeller for Honda 35–50 HP outboard applications using Honda impeller 19210-ZV5-003. Before ordering, verify the engine serial number and lower unit parts diagram. If the outboard has been overheated or run dry, inspect the complete water pump stack rather than replacing only the rubber impeller.
Shipping: Ships same or next day for fast Canada wide shipping. ⚓
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
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If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
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Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
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