ARCO WP002 Volvo Penta / Indmar Ford 302 Replacement Water Pump | Replaces 857451 / 856952
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ARCO WP002 Volvo Penta / Indmar Ford 302 Replacement Water Pump
Part Number: WP002 (ARCO) | Brand: ARCO Marine | UPC: 693006030104
ARCO WP002 is a complete premium replacement engine water pump for compatible Indmar Ford 302 marine engines and Volvo Penta installations originally equipped with pump references 841640, 856952, or 857451. It restores proper coolant circulation when the original pump is leaking, noisy, corroded, or mechanically worn. Every ARCO pump is factory-tested before packaging.
Important: WP002 is an ARCO aftermarket replacement pump — not a genuine Volvo Penta OEM assembly. Confirm fitment by the original pump number or engine parts diagram, not by engine displacement alone.
Specifications
- Manufacturer Part Number: WP002
- Brand: ARCO Marine
- Product Type: Complete Engine Water Pump Assembly
- System: Closed-circuit (freshwater) engine cooling
- Weight: 1,805 g / approx. 4.0 lb
- UPC: 693006030104
Compatible Applications
Fitment is confirmed by original pump number — not engine displacement alone. Marine Ford 302 engines can use different cooling pumps depending on the mariniser, model year, and installation configuration.
- Indmar Ford 302 marine engine applications
- Volvo Penta installations originally specifying pump 841640
- Volvo Penta installations originally specifying pump 856952
- Volvo Penta installations originally specifying pump 857451
On repowered or modified boats, confirm the pump mounting pattern, pulley arrangement, and hose connections match before ordering.
Fitment Notice
Before ordering, verify the original pump or engine parts diagram references one of the following:
- ARCO WP002
- Volvo Penta 841640
- Volvo Penta 856952
- Volvo Penta 857451
- Sierra 18-3586-1
Do not confuse WP002 with the ARCO WP003, which covers different engine applications and replaces Volvo Penta 3860703 for Indmar Ford 351 installations.
When to Replace the Complete Pump
A new impeller cannot compensate for a worn housing, failed shaft seal, or loose bearing. Replace the complete assembly when:
- Coolant leaks from the shaft seal or housing
- Pump bearing is noisy, rough, or seized
- Pulley develops wobble or excessive play
- Engine temperature rises despite correct coolant level and thermostat
- Coolant circulation is weak or inconsistent
- Shaft is difficult to rotate or binds
- Housing is cracked or heavily corroded
- Belt alignment cannot be maintained due to bearing wear
Installation Notes
- Allow the engine to cool completely before beginning service
- Disconnect the battery
- Drain the cooling system below the pump level
- Record original belt routing and pulley position before removal
- Inspect the drive belt, pulley, and all mounting hardware — replace worn items at the same time
- Clean the engine mounting surface thoroughly before fitting the new pump
- Install the correct gasket or sealing components per the engine service procedure
- Tighten mounting bolts evenly to the specified torque
- Confirm pulley alignment before tensioning the belt
- Refill the system with the specified coolant mixture and bleed trapped air per the engine manufacturer’s procedure
- Run the engine and verify no leaks, correct belt tracking, and stable operating temperature
Cross-Reference Part Numbers
- ARCO: WP002
- Volvo Penta: 841640
- Volvo Penta: 856952
- Volvo Penta: 857451
- Sierra: 18-3586-1
- UPC: 693006030104
Related Products
- ARCO WP003 Volvo Penta Replacement Water Pump — Ford 351 / Volvo Penta 3860703 variant
- Volvo Penta Seawater Pump 24219064 — D6-series seawater pump
- Sierra 18-3075 Neoprene Impeller Kit — raw-water pump impeller for related Volvo Penta cooling applications
Parts Desk Insights
Best use case: WP002 is the right call when the freshwater cooling pump on an Indmar Ford 302 or a Volvo Penta installation referencing 841640 / 856952 / 857451 has a leaking seal, noisy bearing, or is simply due for replacement as part of a cooling-system overhaul. It’s a factory-tested complete assembly — not a rebuilt unit — so you’re not inheriting the wear patterns of the old core.
Common issues: The most frequent ordering mistake is confusing WP002 with the WP003. Both cover Volvo Penta / Indmar applications, but WP002 is the Ford 302 version and WP003 is the Ford 351 version — they are not interchangeable. Always confirm the original pump number from the three Volvo Penta references above before ordering. On repowered boats especially, the installed engine may have been swapped to a non-original configuration, so the pump number is a more reliable guide than the engine plate.
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.