ARCO IP002 Volvo Penta Raw Water Pump Impeller | Replaces 21951346 / 3862281
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ARCO IP002 Volvo Penta Raw Water Pump Impeller
Part Number: IP002 (ARCO) | Brand: ARCO Marine | UPC: 693006030142
ARCO IP002 is a premium replacement raw-water pump impeller for a broad range of Volvo Penta gasoline and diesel marine engines. It directly cross-references Volvo Penta 21951346, 3862281, 3850107, and 877400, as well as Sierra 18-3081 — a widely used impeller family that spans Volvo Penta's AQ-series gasoline engines through the 2003-series and selected diesel models including the D2-55 and D2-75.
The impeller uses a 12-blade design with a 12-spline drive hub, measuring approximately 2.25 in. / 57 mm outside diameter and 1.24 in. / 31.5 mm wide. Confirm the 12-spline hub and OEM part number before ordering — this family has been superseded multiple times within the Volvo Penta parts system.
Specifications
- Manufacturer Part Number: IP002
- Brand: ARCO Marine
- Product Type: Flexible Raw Water Pump Impeller
- Blades: 12
- Hub Drive: 12-spline
- Outside Diameter: approx. 2.25 in. / 57 mm
- Width: approx. 1.24 in. / 31.5 mm
- System: Engine-mounted raw-water (seawater) cooling pump
- UPC: 693006030142
Compatible Applications
Fitment is confirmed by existing OEM impeller number, engine model, and raw-water pump model — not displacement alone. This impeller family is used across a wide range of Volvo Penta gasoline and diesel applications. Documented engine families include:
- Volvo Penta AQ-series gasoline engines
- Volvo Penta 3.0L gasoline
- Volvo Penta 4.3L gasoline
- Volvo Penta 5.0L gasoline
- Volvo Penta 5.7L gasoline
- Volvo Penta 5.8L gasoline
- Volvo Penta 7.4L gasoline
- Volvo Penta 8.1L / 8.2L gasoline
- Volvo Penta 2003-series
- Volvo Penta D2-55 diesel
- Volvo Penta D2-75 diesel
- Selected DP-A, DP-C, DP-D and SP-series drive applications
Confirm fitment against your existing OEM impeller number or pump model number before ordering.
Fitment Notice
Before ordering, confirm all of the following:
- Existing OEM impeller number (Volvo Penta 21951346, 3862281, 3850107, or 877400)
- Volvo Penta engine model and serial number
- Raw-water pump model
- Hub drive: 12-spline (not single-flat or keyed)
- Outside diameter: approx. 2.25 in. / 57 mm
- Width: approx. 1.24 in. / 31.5 mm
Volvo Penta has superseded this impeller family more than once. If your existing number is the current Volvo service ref 24715100, this ARCO impeller is also catalogued as a replacement for that reference family.
Service Interval
Inspect the raw-water pump impeller at each annual cooling-system service. Replace immediately when any of the following are observed:
- Reduced or absent cooling-water flow at the exhaust outlet
- Engine overheating during operation
- Impeller blades cracked, torn, stiff, hardened, or permanently bent
- Blade material missing — inspect all downstream hoses, heat exchangers, and coolers before fitting the replacement
- Pump has run dry (replace immediately)
- Scheduled annual raw-water pump service interval reached
Installation Notes
- Close the raw-water intake seacock or raise the drive before disassembly
- Remove the pump cover and extract the old impeller — inspect all blades and account for any missing pieces
- Inspect the pump bore, cam surface, and cover plate for scoring or corrosion before fitting the new impeller
- Confirm the 12-spline hub aligns correctly with the pump shaft
- Lubricate the impeller blades and bore with glycerin or dish soap before installation — do not use petroleum-based lubricants
- Rotate the shaft in its normal operating direction while pressing the impeller into the bore to pre-set vane direction
- Replace the pump cover O-ring or gasket as applicable
- Open the seacock and verify strong water flow at the exhaust immediately after startup
Cross-Reference Part Numbers
- ARCO: IP002
- Volvo Penta: 877400
- Volvo Penta: 3850107
- Volvo Penta: 3862281
- Volvo Penta: 21951346
- Volvo Penta (current ref): 24715100
- Sierra: 18-3081
- Sierra: 18-3277
- Johnson Pump: 09-1027B
- Jabsco: 1210-0001
- Mallory: 9-45703
- UPC: 693006030142
Related Products
- Volvo Neoprene Impeller Kit — OEM-style kit for Volvo Penta raw-water pump service
- Jabsco 1210-0001-P Neoprene Impeller Kit — Jabsco cross-reference impeller kit
- Johnson Pump F5B Impeller Kit 09-1027B-1 — Johnson Pump cross-reference (replaces Jabsco 1210-0001)
- Johnson Pump 09-1027B-10 Impeller Kit — additional Johnson Pump cross-reference
Parts Desk Insights
Best use case: ARCO IP002 is the right annual-service impeller for a wide range of Volvo Penta gasoline and diesel installations — from the AQ-series through the 2003-series and light diesel models like the D2-55 and D2-75. If your existing impeller number is anywhere in the 877400 / 3850107 / 3862281 / 21951346 / 24715100 supersession chain, this is your replacement. It's also a reliable choice when buying OEM is slower or more expensive and you need a confirmed cross-reference.
Common issues: The most frequent ordering challenge with this family is navigating Volvo Penta's multiple supersession changes — customers often arrive with an older OEM number and aren't sure if IP002 still covers it. The answer is yes for all numbers in that chain. The other common error is confusing the 12-spline hub with other Volvo impellers that use a keyed or single-flat drive — always confirm the hub type from your pump or the existing impeller before ordering. If blade pieces are missing after removing the old impeller, search all downstream passages carefully: a fragment lodged in a heat exchanger or thermostat housing will cause overheating on the very next run.
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 — 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 — 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.