Complete Seal Kit – Fits Volvo Penta XDP-B, X-B, X-BLT, XHP-BLT, XXP-A, XXP-ALT, XXP-D3 Sterndrive (Replaces 3859050)
Complete Seal Kit – Fits Volvo Penta XDP-B, X-B, X-BLT, XHP-BLT, XXP-A, XXP-ALT, XXP-D3 Sterndrive (Replaces 3859050) 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
Complete Seal Kit – Fits Volvo Penta XDP-B, X-B, X-BLT, XHP-BLT, XX...
Product Details
This Complete Seal Kit – Fits Volvo Penta XDP-B, X-B, X-BLT, XHP-BLT, XXP-A, XXP-ALT, XXP-D3 Sterndrive (Replaces 3859050) is a comprehensive gasket and seal kit designed for Volvo Penta marine sterndrive applications. It specifically fits the XDP-B, X-B, X-BLT, XHP-BLT, XXP-A, XXP-ALT, and XXP-D3 drive models.
It serves as a direct replacement part, providing an interchange for Volvo Penta 3859050 and Orbitrade 23023.
- Installation is straightforward as a direct replacement for OEM components.
- Suitable for both gasoline and diesel marine sterndrive applications.
- Contains all necessary O-rings, seals, and gaskets for a complete service.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Volvo Penta | 3859050 |
| Orbitrade | 23023 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Volvo Penta Models: This kit covers a range of sterndrives. Please verify your specific model against this list.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Volvo Penta | XDP-B | 3859050 | ||||
| Volvo Penta | X-B | 3859050 | ||||
| Volvo Penta | X-BLT | 3859050 | ||||
| Volvo Penta | XHP-BLT | 3859050 | ||||
| Volvo Penta | XXP-A | 3859050 | ||||
| Volvo Penta | XXP-ALT | 3859050 | ||||
| Volvo Penta | XXP-D3 | 3859050 |
Technical Specs
- Product Type
- Complete Seal/Gasket Kit
- Installation
- Direct replacement
- Fuel Type
- Gasoline/Diesel (Marine)
- Housing Material
- Various (Rubber/Metal)
- Warranty
- 90 Day (Aftermarket versions)
- Other Technical Attributes
- Contains assorted O-rings, seals, gaskets, split pins, and washers for complete service
- Product Dimensions
- 18.5" L x 14.5" W x 1.5" H
- Box Dimensions
- 18.5" L x 14.5" W x 1.5" H
What’s in the Box
- 1 x O-Ring (3852045)
- 1 x Gasket (3862105)
- 1 x O-Ring (190187)
- 1 x O-Ring (3855081)
- 1 x Washer (3860430)
- 1 x O-Ring (949974)
- 1 x Split Pin (3854480)
- 1 x O-Ring (925093)
- 1 x Sealing Ring (853868)
- 1 x O-Ring (3852565)
- 1 x Seal (3852272)
- 1 x O-Ring (925095)
- 1 x O-Ring (949656)
- 1 x Sealing Ring (853871)
- 1 x O-Ring (942791)
- 1 x O-Ring (946438)
- 1 x O-Ring (955981)
- 1 x Sealing Ring (851407)
- 1 x O-Ring (3852865)
Installation Notes
- Disconnect the boat's battery and follow all safety precautions before beginning work.
- Drain the sterndrive gear lube completely into a suitable container.
- Carefully detach the sterndrive from the transom shield assembly according to the manufacturer's service manual.
- Once the unit is accessible, meticulously remove all old seals, o-rings, and gasket material.
- Thoroughly clean all mating surfaces, ensuring they are free of debris, corrosion, and old sealant.
- Install the new seals, gaskets, and o-rings from the kit, applying a light coat of marine grease where appropriate.
- Reassemble the sterndrive unit, ensuring all components are aligned correctly and bolts are torqued to spec.
- Refill the sterndrive with the correct type and amount of gear lube.
- After reassembly, check for any leaks around the newly sealed areas before operating the vessel.
Troubleshooting & FAQ
How do I know if this seal kit is the correct one for my sterndrive?
The best way to ensure a match is to compare your original part number to the cross-references provided: Volvo Penta 3859050 and Orbitrade 23023. Also, check that your specific drive model (e.g., XDP-B, XXP-A) is listed in our compatibility table.
What are the common signs that my sterndrive seals are failing?
Common symptoms include visible water in your gear lube (milky or creamy appearance), oil slicks on the water behind your boat when parked, or a noticeable drop in the gear lube level in the reservoir. Any of these signs warrant an inspection.
Is any special sealant needed when using this gasket kit?
Generally, these gaskets are designed to seal without additional chemical sealants. However, always consult your specific Volvo Penta service manual. Some applications may recommend a light application of a specific gasket dressing or sealant on certain surfaces.
How often should sterndrive seals and gaskets be replaced?
There is no fixed interval, but seals should be inspected annually as part of regular maintenance. It is common practice to replace them whenever the sterndrive is removed for major service or if any signs of leaking are detected.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). It is built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility and batch-inspected for consistency.
Shipping speed & cost?
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free; expedited options will appear at checkout where available.
Warranty & returns?
This product is covered by a 1-year warranty against manufacturing defects under normal use. If any issues arise, please contact our support team with your order details. Returns are accepted within our standard window, provided the item is unused and in its original condition. See our policy page or reach out for instructions.
Safety & Important Info
- Verify images and specifications against 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 quality control.
Payment & Security
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