ARCO IP001 Mercury / MerCruiser Seawater Pump Impeller | Replaces 47-8M0104229
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ARCO IP001 Mercury / MerCruiser Seawater Pump Impeller
Part Number: IP001 (ARCO) Ā |Ā Brand: ARCO Marine Ā |Ā UPC: 693006030135
ARCO IP001 is a premium flexible impeller for the engine-mounted brass seawater pump used on 2000-and-newer MerCruiser V6 and V8 sterndrive and inboard applications. It is a direct replacement for Mercury / Quicksilver 47-8M0104229 and 47-862232A2 ā the impeller family fitted to Alpha, Bravo, and high-performance configurations where the later brass pump is installed.
The impeller features 8 vanes, an approximate diameter of 2-5/8 in. / 66.7 mm, and a width of approximately 2 in. / 50.8 mm. The hub incorporates a two-flat drive interface matching the later brass pump shaft ā confirm the OEM part number rather than selecting by diameter alone.
Compatible Applications
Fits MerCruiser sterndrive and inboard engines equipped with the brass engine-mounted seawater pump specifying OEM impeller reference 47-8M0104229 or 47-862232A2. Verified engine families include:
- MerCruiser MCM 4.5L MPI
- MerCruiser 4.3L V6
- MerCruiser 5.0L V8
- MerCruiser 5.7L / 350 CID V8
- MerCruiser 6.2L V8
- MerCruiser 8.1L / 496 CID V8
Generally applies to 2000-and-newer applications. Confirm by engine serial number and existing OEM impeller number before ordering.
Fitment Notice
Before ordering, confirm all of the following:
- Existing OEM impeller number stamped on the pump or listed in your engine's parts diagram
- Engine model and serial number
- Brass engine-mounted seawater pump is fitted (not an older-style pump)
- OEM cross-reference is 47-8M0104229 or 47-862232A2
- Hub drive configuration (two-flat shaft)
MerCruiser V6 and V8 engines across model years use different impellers depending on pump design. Matching the OEM part number is more reliable than selecting by engine displacement alone.
Specifications
- Manufacturer Part Number: IP001
- Brand: ARCO Marine
- Product Type: Flexible Seawater Pump Impeller
- Vanes: 8
- Impeller Diameter: approx. 2-5/8 in. / 66.7 mm
- Width: approx. 2 in. / 50.8 mm
- Hub Drive: Two-flat interface
- System: Engine-mounted brass seawater (raw water) cooling pump
- UPC: 693006030135
Service Interval
Inspect the impeller annually at season launch. Replace immediately if any of the following are observed:
- Reduced or absent cooling-water flow at the exhaust outlet
- Engine overheating during operation
- Vanes cracked, missing, hardened, or permanently set
- Evidence the pump has run dry
- Hub wear or shaft slippage
- Scheduled seawater pump service interval reached
If vane material is missing, inspect all downstream cooling passages and heat exchanger before installing a new impeller ā fragments cause blockages and repeat overheating events.
Installation Notes
- Close the raw-water intake seacock or raise the drive before disassembly
- Remove the seawater pump cover and extract the old impeller
- Inspect the pump housing bore and wear plate for scoring or corrosion ā replace if damaged
- Remove all fragments of the old impeller from the pump and downstream passages
- Confirm the new impeller hub matches the pump shaft drive configuration
- Lubricate the impeller and housing bore with a suitable installation lubricant (dish soap or glycerin)
- Rotate the shaft in its normal operating direction while seating the impeller to pre-set vane direction
- Replace the pump cover O-ring or gasket
- Verify strong cooling-water flow at the exhaust outlet after startup
The Mercury OEM service kit 47-8M0104229 includes the impeller and replacement O-ring for a complete pump service.
Cross-Reference Part Numbers
- ARCO: IP001
- Mercury / Quicksilver: 47-8M0104229
- Mercury / Quicksilver: 47-862232A2
- Mercury: 862232A2
- Sierra: 18-3016-1
- Mallory: 9-45310
- GLM: 89700
- UPC: 693006030135
Related Products
- Mercury MerCruiser Quicksilver Impeller Kit 8M0104229 ā OEM kit with impeller and O-ring
- Sierra Marine Water Pump Impeller 18-3016-1 ā Mercury / Mariner V6 Outboard
- Sierra Impeller Kit 18-3016-1 ā Mercury / Mariner Outboard Water Pump Service Kit
Parts Desk Insights
Best use case: ARCO IP001 is the go-to replacement for annual seawater pump service on 2000-and-newer MerCruiser V6 and V8 engines running the brass pump. It's a strong choice for pre-season maintenance or post-overheating inspection when you want a reliable aftermarket alternative to the OEM kit. For a complete pump service, pair it with a new pump cover O-ring ā the Mercury OEM kit 8M0104229 includes both if you prefer to source OEM.
Common issue: The most frequent fitment error is ordering by engine displacement without checking the pump type. MerCruiser uses more than one seawater pump design across the same engine family ā the brass pump and the older-style pump use different impellers that are not interchangeable. Always confirm the existing OEM impeller number (47-8M0104229 or 47-862232A2) before ordering. Also note: one catalog source lists Sierra 18-3160-1 beside IP001 ā this appears to be a typo. The correct Sierra cross-reference is 18-3016-1.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us ā and we back it with a straightforward 30-Day Satisfaction Guarantee.
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.
To qualify for a return:
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:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity ā and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.