Water Pump Service Kit – Fits Volvo Penta AQ165A, AQ170A/B/C, MD21A/B (Replaces 875383)
Water Pump Service Kit – Fits Volvo Penta AQ165A, AQ170A/B/C, MD21A/B (Replaces 875383) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Water Pump Service Kit – Fits Volvo Penta AQ165A, AQ170A/B/C, MD21A...
Product Details
This Water Pump Service Kit – Fits Volvo Penta AQ165A, AQ170A/B/C, MD21A/B (Replaces 875383) provides the essential components needed to rebuild the raw water pump on various Volvo Penta inboard and inboard/outboard engines, including models AQ165A, AQ170A/B/C, and MD21A/B (from MO 103387 and up).
It serves as a direct replacement for Volvo Penta 875383, ORB15383, and Sierra 18-3209, ensuring proper fit and function for a complete service.
- Engineered for direct-fit installation.
- Restores pump performance for efficient engine cooling.
- Includes key components for a standard water pump rebuild.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Volvo Penta | 875383 |
| Orbitrade | ORB15383 |
| Sierra | 18-3209 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
Designed for specific Volvo Penta inboard and I/O models listed here.
| Brand | Model | OEM Part No. | Notes |
|---|---|---|---|
| Volvo Penta | AQ165A | 875383 | |
| Volvo Penta | AQ170A | 875383 | |
| Volvo Penta | AQ170B | 875383 | |
| Volvo Penta | AQ170C | 875383 | |
| Volvo Penta | MD21A | 875383 | MO 103387 and up |
| Volvo Penta | MD21B | 875383 |
Technical Specs
- Product Type
- Water Pump Service/Repair Kit
- Installation
- Direct Replacement
- Dimensions
- 9.0" x 9.0" x 9.0"
- Other Technical Attributes
- For water pump repair/rebuild
Installation Notes
- Ensure the engine is off, cool, and the battery is disconnected. Close the water intake seacock.
- Place a container beneath the water pump to catch any spilled coolant or water.
- Loosen and remove the drive belt from the pump pulley.
- Remove the bolts securing the water pump cover or housing. Keep track of bolt lengths and positions.
- Carefully pry the cover loose. Remove the old O-ring or gasket and the worn impeller.
- Inspect the pump housing for scoring or damage. Clean all gasket mating surfaces thoroughly.
- Install the new seals and gaskets as supplied in the kit. Use a suitable sealant if recommended by the engine manufacturer.
- Lubricate the new impeller with water or glycerine and insert it into the housing, rotating in the correct operational direction.
- Reinstall the pump cover, ensuring the gasket is properly seated. Tighten the bolts in a star pattern to the manufacturer-specified torque.
- Reattach the drive belt and adjust to the correct tension.
- Open the seacock, reconnect the battery, and refill the cooling system.
- Start the engine and immediately check for water leaks and verify proper water flow from the exhaust.
Troubleshooting & FAQ
How can I tell if my water pump needs this service kit?
Common signs of a failing water pump impeller or seals include engine overheating at idle or low speeds, a reduced stream of water from the exhaust outlet, or visible water leaks from the pump housing weep hole.
Will this kit fit an MD21A engine with a serial number lower than MO 103387?
No, this kit is specified for MD21A models starting from serial number MO 103387. Earlier models may use a different water pump design. Always verify your engine's specifications before ordering.
What is the recommended service interval for a raw water pump impeller?
It is generally recommended to inspect your impeller annually and replace it every 1-2 years or every 100-200 hours of operation, depending on usage conditions (e.g., sandy or silty water may require more frequent changes).
Are any special tools required for installation?
Standard mechanical tools are typically sufficient. However, a pair of needle-nose pliers or an impeller puller can be helpful for removing the old impeller. A torque wrench is recommended for tightening cover bolts to the correct specification.
Is this an OEM Volvo Penta part?
This listing is an aftermarket replacement, not an OEM component. It is built to meet or exceed OEM-level specifications using comparable materials and is manufactured in an ISO 9001 certified facility, with batch inspections to ensure quality and consistency.
How fast do you ship and what does it cost?
We ship worldwide quickly—typical transit is 5–15 days for most destinations. Standard shipping is free. Expedited shipping options, if available for your location, will be presented at checkout.
What is the warranty and return policy?
This product is covered by a 1-year warranty against manufacturing defects under normal marine use. If you encounter an issue, please contact our support team with your order details. Returns are accepted within our standard window for items that are unused and in their original condition. See our policy page or reach out for instructions.
Safety & Important Info
- Verify images and specifications against your original part before purchase. If anything differs—even if your model is listed as compatible—do not install the part.
- This is an aftermarket replacement component, not an original equipment manufacturer (OEM) part.
- Professional installation is highly recommended for safety, proper function, and to prevent engine damage.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and rigorously tested for real-world conditions.
- Fast Global Fulfillment — Enjoy free standard delivery to most regions, with typical transit times of 5–15 days.
- Manufacturer-Direct Value — By working directly with manufacturers, we offer fair pricing without compromising on materials or quality control.
Payment & Security
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