Propeller Shaft Oil Seal – Fits OMC Cobra SX, Volvo Penta SX (Replaces 3863090, 3858303, 3853474)
Propeller Shaft Oil Seal – Fits OMC Cobra SX, Volvo Penta SX (Replaces 3863090, 3858303, 3853474) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
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Delivery and Shipping
Free standard shipping on all orders under 1 KG
Propeller Shaft Oil Seal – Fits OMC Cobra SX, Volvo Penta SX (Repla...
Product Details
This Propeller Shaft Oil Seal 3863090 – Fits OMC Cobra SX Stern Drives (Replaces 3858303, 3853474, 3850482) is designed for the propeller shaft of OMC Cobra SX stern drives (1994 and up) and compatible Volvo Penta SX drives. It provides critical sealing of the propeller shaft to prevent oil leakage from the lower gearcase.
This part serves as a direct replacement for OMC numbers 3863090, 3858303, 3853474, 3850482, 0915223, 0769349; Volvo numbers 3863090, 3858303; and GLM 86260.
- Installs in the lower unit gearcase.
- Used within the propeller shaft carrier assembly to prevent gear lube leakage.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| OMC | 3863090 |
| OMC | 3858303 |
| OMC | 3853474 |
| OMC | 3850482 |
| OMC | 0915223 |
| OMC | 0769349 |
| Volvo Penta | 3863090 |
| Volvo Penta | 3858303 |
| GLM | 86260 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For OMC models, this part fits Cobra SX drives from 1994 and newer.
For Volvo Penta models, this part fits various SX and DPS drives.
| Brand | Model | Years | OEM Part No. | Notes |
|---|---|---|---|---|
| OMC | SXC | 1994 & Up | 3863090 | |
| OMC | SX-C1 | 1994 & Up | 3863090 | |
| OMC | SX-C2 | 1994 & Up | 3863090 | |
| OMC | SX-CT | 1994 & Up | 3863090 | |
| OMC | SX-CT1 | 1994 & Up | 3863090 | |
| OMC | SX-R | 1994 & Up | 3863090 | |
| OMC | SX-RT1 | 1994 & Up | 3863090 | |
| OMC | SX-RT2 | 1994 & Up | 3863090 | |
| OMC | DP-S | 1994 & Up | 3863090 | |
| OMC | DP-S1 | 1994 & Up | 3863090 | |
| OMC | SX-C1AC | 1994 & Up | 3863090 | |
| OMC | SX-M | 1994 & Up | 3863090 | Also SX-M 1.43, 1.51, 1.60, 1.66, 1.79, 1.89, 1.97, 2.18 |
| OMC | SX-MTD | 1994 & Up | 3863090 | Also SX-MTD 1.66, 1.79 |
| OMC | SX-MTD3 | 1994 & Up | 3863090 | |
| OMC | SX-A | 1994 & Up | 3863090 | Also SX-A 1.43, 1.51, 1.60, 1.66, 1.79, 1.89, 1.97 |
| Volvo Penta | SX | 3863090 | ||
| Volvo Penta | DPS-A | 3863090 | Also DPS-A OXi | |
| Volvo Penta | DPS-B | 3863090 | Also DPS-B OX | |
| Volvo Penta | DPS-B1 | 3863090 | Also DPS-B1 OX |
Technical Specs
- Product Type
- Propeller Shaft Oil Seal
- Installation
- Lower Unit Gearcase
- Housing Material
- Rubber with metal casing
- Housing Color
- Black
- Weight
- 50 g (0.11 lb)
- Warranty
- 1 Year (North Boatparts)
- Other Technical Attributes
- Used in propeller shaft carrier assembly
What’s in the Box
- 1 x Oil Seal (3863090/3858303/3853474/3850482/0915223/0769349)
- 1 x O-ring Seal (3852865/0913849/0769363)
- 1 x Gasket
- 1 x Cotter Pin (306394/0019084/3852056/0335325/0765546)
Installation Notes
- Disconnect the battery cables and ensure the engine is off.
- Drain the gearcase lubricant into an approved container.
- Remove the propeller, followed by the propeller shaft housing carrier.
- Carefully pry out the old oil seal from the carrier, taking care not to scratch the metal bore.
- Thoroughly clean the seal seating area in the carrier to remove any old sealant, debris, or corrosion.
- Lightly coat the new oil seal's outer and inner surfaces with fresh marine grease or gear lube.
- Using a suitable seal driver or a socket with the same outer diameter, press the new seal into the carrier until it is seated squarely.
- Reinstall the propeller shaft carrier, ensuring any O-rings or gaskets are correctly positioned.
- Reinstall the propeller and its hardware.
- Refill the gearcase with the manufacturer-recommended lubricant to the proper level.
- Check for any leaks around the seal area before returning to service.
Troubleshooting & FAQ
How do I know if this oil seal will fit my stern drive?
This seal is made for OMC Cobra SX (1994 and newer) and a range of Volvo Penta SX drives. The most reliable way to confirm fitment is to match the part number from your old seal or service manual to one of the numbers in our Part Number Matrix. Also, check your drive's model against the compatibility table.
What are the signs of a failing propeller shaft seal?
The most common signs are visible gear oil leaking around the propeller shaft, water intrusion into the gearcase (which makes the lubricant appear milky or creamy), or a recurring low lubricant level in the lower unit reservoir.
Is a special tool required for installation?
While not strictly mandatory, using a seal driver or a socket with a matching outer diameter is highly recommended. This helps press the new seal in evenly without damaging the seal's metal casing or rubber lip.
How often should this seal be replaced?
It is best practice to inspect the seal for damage or leaks during every annual lower unit service. We recommend replacing it proactively every 2-3 years or anytime the gearcase is disassembled for other service to prevent future failures.
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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