Lower Unit Seal Kit – Fits Volvo Penta SX-A Sterndrive (Replaces 3888821)
Lower Unit Seal Kit – Fits Volvo Penta SX-A Sterndrive (Replaces 3888821) is backordered and will ship as soon as it is back in stock.
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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.).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Lower Unit Seal Kit – Fits Volvo Penta SX-A Sterndrive (Replaces 38...
Product Details
This Lower Unit Seal Kit provides the necessary components to service Volvo Penta SX-A sterndrive units from 2007 and newer, preventing water intrusion and ensuring gearcase integrity.
This kit is a direct aftermarket replacement for Volvo Penta 3888821, Sierra 18-2583, and Orbitrade 23022.
- Includes a complete set of seals, gaskets, and O-rings for lower unit maintenance.
- Engineered for a direct fit on specified Volvo Penta SX-A models.
- Professional installation is recommended for a reliable, leak-free seal.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Volvo Penta | 3888821 |
| Sierra | 18-2583 |
| Orbitrade | 23022 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Volvo Penta engines, verify compatibility against your specific SX-A sterndrive model and year.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. |
|---|---|---|---|---|---|
| Volvo Penta | SX-A | 4-Stroke | 2007 and newer | 3888821 |
Technical Specs
- Product Type
- Lower Unit Seal Kit
- Housing Material
- Various (rubber, paper, metal)
- Dimensions
- Length: 13.0 cm, Width: 10.5 cm, Height: 2.0 cm
- Weight
- 0.04 kg (0.09 lb)
- Other Technical Attributes
- Complete seal kit for lower unit maintenance
What’s in the Box
- 1 x O-Ring (3852866)
- 1 x Gasket (3841968)
- 1 x Gasket (3841966)
- 2 x O-Ring (925259)
- 1 x Oil Seal (3858303/3863090)
- 1 x Oil Seal (3855081)
Installation Notes
- Disconnect the battery and ensure the engine is off. Drain the gearcase oil completely into an approved container.
- Remove the lower unit from the sterndrive assembly according to the manufacturer's service manual.
- Carefully disassemble the lower unit to access the old seals, O-rings, and gaskets, taking note of their orientation.
- Clean all mating surfaces thoroughly, ensuring they are free of old adhesive, gasket material, and corrosion.
- Install the new seals and gaskets from the kit, using appropriate seal drivers to ensure they are seated correctly without damage.
- Reassemble the lower unit, applying marine-grade grease and sealant as specified and torquing all bolts to manufacturer specifications.
- Reinstall the lower unit, refill the gearcase with new marine gear lube, and perform a leak test before returning to service.
Troubleshooting & FAQ
How do I know if this seal kit fits my sterndrive?
This kit is specifically designed for Volvo Penta SX-A sterndrive units manufactured in 2007 and later. The surest way to confirm fitment is to match your original part number to one of the cross-references, primarily the OEM number 3888821.
What are the signs my lower unit seals are failing?
Common signs of seal failure include milky, water-contaminated gear lube upon draining, visible oil leaks around the propeller shaft or lower unit casing, or an unusual burning smell from the gearcase due to lubrication failure.
How often should lower unit seals be replaced?
For preventative maintenance, seals should be inspected annually when changing the gear lube and replaced every 2-3 years, or immediately if any leaks or water intrusion are detected.
Is this kit difficult to install?
Installation requires specific tools (like seal pullers and drivers) and mechanical knowledge of sterndrive systems. To ensure a proper, leak-free repair and avoid damage to components, professional installation is strongly recommended.
How does this compare to the OEM kit?
Our aftermarket kit is engineered to meet or exceed OEM specifications for material quality, dimensions, and performance. It provides a reliable, cost-effective alternative to the original manufacturer's part.
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.
Payment & Security
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