Lower Unit Seal Kit – Fits Volvo Penta SX-A Sterndrive (Replaces 3888821, 18-2583)
Lower Unit Seal Kit – Fits Volvo Penta SX-A Sterndrive (Replaces 3888821, 18-2583) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
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Lower Unit Seal Kit – Fits Volvo Penta SX-A Sterndrive (Replaces 38...
Lower Unit Seal Kit – Fits Volvo Penta SX-A Sterndrive (Replaces 3888821, 18-2583) is backordered and will ship as soon as it is back in stock.
Product Details
This Lower Unit Seal Kit – Fits Volvo Penta SX-A Sterndrive is designed specifically for Volvo Penta SX-A lower gearcase assemblies. It provides a complete seal solution for transom sterndrive units, ensuring reliable protection against water intrusion and oil leakage during regular maintenance or gearcase rebuilds.
This aftermarket kit directly replaces Volvo Penta 3888821, Orbitrade 23022, and Sierra 18-2583.
- Complete lower gearcase seal replacement for SX-A sterndrives
- Designed for straightforward installation during routine lower unit service
- Includes all essential seals for lower unit rebuild or maintenance
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Volvo Penta | 3888821 |
| Orbitrade | 23022 |
| Sierra | 18-2583 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model |
|---|---|
| Volvo Penta | SX-A |
Technical Specs
- Application
- Lower gearcase seal kit
- Fitment
- Volvo Penta SX-A sterndrive
- Component Type
- Transom sterndrive lower unit seal kit
What's in the Box
- Complete lower unit seal kit (all seals required for SX-A lower gearcase service)
Installation Notes
- Disconnect the battery and raise the sterndrive to the full-tilt position before beginning work.
- Drain all lower unit gear oil completely and inspect for metal shavings or water contamination.
- Detach the lower unit from the upper gearcase following manufacturer torque sequence and alignment procedures.
- Remove old seals carefully, cleaning all mating surfaces thoroughly with a non-abrasive solvent.
- Inspect seal bores and shafts for scoring, corrosion, or wear that may compromise new seal performance.
- Lubricate new seals lightly with gear oil before installation to prevent tearing during assembly.
- Press seals into place squarely using appropriate seal drivers to avoid cocking or damage.
- Reassemble the lower unit to the upper gearcase, ensuring proper shaft alignment and torque specifications.
- Refill the lower unit with the correct grade and quantity of gear oil per Volvo Penta specifications.
- Run the engine briefly and inspect all seal areas for leaks before returning to service.
Troubleshooting & FAQ
How do I know if my lower unit seals need replacement?
Signs include visible gear oil leaks around the lower unit, water in the gear oil (milky appearance), or excessive oil consumption. Regular inspection during seasonal maintenance is recommended.
Can I reuse old seals during reinstallation?
No. Seals are designed for single use and lose their sealing integrity once removed. Always replace seals during any lower unit disassembly to prevent leaks.
What tools are required for installation?
You will need seal drivers or appropriately sized sockets, a torque wrench, gear oil pump, and basic hand tools. A service manual for your specific SX-A model is highly recommended.
Is this kit compatible with SX-C or SX-M models?
No. This kit is engineered specifically for SX-A sterndrives. Different Volvo Penta sterndrive models require their own dedicated seal kits.
How often should lower unit seals be replaced?
Replace seals whenever the lower unit is disassembled for service, or if leaks are detected. Regular gear oil inspection every 50–100 hours helps identify seal failure early.
What type of gear oil should I use after installation?
Use Volvo Penta-recommended lower unit gear oil or an equivalent synthetic or mineral oil meeting the specified viscosity and performance standards for your SX-A drive.
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 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 QC.
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