Water Pump – Fits Volvo Penta AQ120B, AQ125A, AQ140A, AQ145A (Replaces 3587508, 828023)
Water Pump – Fits Volvo Penta AQ120B, AQ125A, AQ140A, AQ145A (Replaces 3587508, 828023) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
U.S. orders usually arrive within 6–15 days, depending on stock location and destination.
International delivery times may vary due to customs processing.
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Water Pump – Fits Volvo Penta AQ120B, AQ125A, AQ140A, AQ145A (Replaces 3587508, 828023) is backordered and will ship as soon as it is back in stock.
Product Details
This is a direct-replacement circulation Water Pump – Fits Volvo Penta AQ120B, AQ125A, AQ140A, AQ145A and related marine engines. It is designed for Volvo Penta models using B21 and B23 engine blocks, including the AQ120B, AQ125A, AQ140A, BB140A, AQ145A, and BB145A series manufactured between 1977 and 1990.
This component directly replaces Volvo Penta part numbers 3587508, 828023, and 828023-2, ensuring precise fitment and function.
- Engineered for direct-replacement installation.
- Durable cast metal housing suitable for the marine environment.
- Includes the main pump assembly required for installation.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Volvo Penta | 3587508 |
| Volvo Penta | 828023 |
| Volvo Penta | 828023-2 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
Compatible with select 4-stroke gasoline Volvo Penta sterndrive engines from the specified model years.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Volvo Penta | AQ120B | 120 | 4-Stroke | 1977–1990 | 3587508 | B21 engine block |
| Volvo Penta | AQ125A | 125 | 4-Stroke | 1977–1990 | 3587508 | B21 engine block |
| Volvo Penta | AQ140A | 140 | 4-Stroke | 1977–1990 | 3587508 | B23 engine block |
| Volvo Penta | BB140A | 140 | 4-Stroke | 1977–1990 | 3587508 | B23 engine block |
| Volvo Penta | AQ145A | 145 | 4-Stroke | 1977–1990 | 3587508 | B23 engine block |
| Volvo Penta | BB145A | 145 | 4-Stroke | 1977–1990 | 3587508 | B23 engine block |
Technical Specs
- Product Type
- Circulation Water Pump
- Fuel Type
- Gasoline
- Installation
- Direct replacement
- Housing Material
- Cast metal
- Dimensions
- Height: 155 mm, Width: 255 mm, Length: 260 mm
- Weight
- 1.78 kg (3.92 lb)
- Operating Temperature
- Marine engine operating range
- Other Technical Attributes
- Cooling system circulation pump for B21, B23 based engines
- Warranty
- 1 year (standard aftermarket)
What’s in the Box
- 1 x Water Pump Assembly (3587508)
Installation Notes
- Disconnect the boat’s battery to prevent electrical shorts.
- Place a container under the engine and drain the coolant completely.
- Loosen the tensioner pulley and remove the serpentine belt from the pump.
- Disconnect the inlet and outlet hoses attached to the water pump. Be prepared for some residual coolant spillage.
- Remove the mounting bolts securing the old water pump to the engine block.
- Carefully detach the old pump and its gasket. Thoroughly clean the mounting surface on the engine, removing all old gasket material and corrosion.
- Position the new gasket and install the new water pump assembly.
- Tighten the mounting bolts in a star pattern to the manufacturer's recommended torque specifications to ensure an even seal.
- Reconnect the coolant hoses and securely fasten their clamps.
- Reinstall the serpentine belt, ensuring it is correctly routed and tensioned.
- Refill the cooling system with the appropriate coolant mixture.
- Reconnect the battery, start the engine, and let it run for several minutes while checking for any leaks around the pump and hoses.
Troubleshooting & FAQ
How do I know if this pump fits my engine?
This pump is designed for specific Volvo Penta models: AQ120B, AQ125A, AQ140A, BB140A, AQ145A, and BB145A (1977–1990). Always cross-reference your engine model and original part number with the compatibility tables on this page before ordering.
What are the common signs of a failing water pump?
Symptoms include coolant leaks from the pump's weep hole, engine overheating, a loose or noisy pulley, or visible rust and corrosion on the pump housing. Any of these signs suggest it's time for an inspection or replacement.
How often should a marine water pump be replaced?
Unlike raw water pump impellers, engine circulation pumps do not have a fixed service interval. They should be inspected regularly for leaks or bearing noise and replaced as a preventative measure during major engine overhauls or as soon as failure symptoms appear.
Can I use an automotive water pump instead?
No. This is a marine-specific circulation pump. Automotive parts are not designed to withstand the corrosive saltwater environment and may have different flow rates or mounting configurations, leading to engine damage.
Is a new gasket included with the pump?
A new gasket is typically required for proper installation to create a leak-proof seal. Please check the "What’s in the Box" section to confirm all included components.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost?
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns?
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
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