Propeller Shaft Oil Seal for OMC Cobra SX and Volvo Penta SX Drives – Replaces 3863090, 3858303, 3853474
Propeller Shaft Oil Seal for OMC Cobra SX and Volvo Penta SX Drives – Replaces 3863090, 3858303, 3853474 is backordered and will ship as soon as it is back in stock.
Worry-free returns
Worry-free returns
Shop with confidence. If you’re not completely satisfied, eligible items may be returned within the return window, provided they are unused and in original packaging.
If the return is due to our error or a defective item, we’ll make it right.
Please contact us before returning any item.
Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
U.S. orders usually arrive within 6–15 days, depending on stock location and destination.
International delivery times may vary due to customs processing.
Tracking information will be provided once your order ships.
Propeller Shaft Oil Seal for OMC Cobra SX and Volvo Penta SX Drives...
Propeller Shaft Oil Seal for OMC Cobra SX and Volvo Penta SX Drives – Replaces 3863090, 3858303, 3853474 is backordered and will ship as soon as it is back in stock.
Product Details
This propeller shaft oil seal is designed for installation in the propeller shaft carrier of OMC Cobra SX stern drives and compatible Volvo Penta SX and DPS drives. It helps seal the lower-unit gearcase and prevent gear-lubricant leakage around the propeller shaft.
Use the reference numbers below to compare this aftermarket replacement with the seal or service information for your drive before ordering.
- Installs in the lower-unit gearcase.
- Used in the propeller shaft carrier assembly.
- Helps prevent gear-lube leakage at the propeller shaft.
- Aftermarket replacement component; not an OEM part.
Part Number Matrix
Confirm the applicable reference number for your stern drive before installation.
| 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
The compatibility information below is provided as a reference. Match your complete drive model, year, serial information and existing part number before purchase.
| Brand | Model | Years | OEM Part No. | Notes |
|---|---|---|---|---|
| OMC | SXC | 1994 and newer | 3863090 | |
| OMC | SX-C1 | 1994 and newer | 3863090 | |
| OMC | SX-C2 | 1994 and newer | 3863090 | |
| OMC | SX-CT | 1994 and newer | 3863090 | |
| OMC | SX-CT1 | 1994 and newer | 3863090 | |
| OMC | SX-R | 1994 and newer | 3863090 | |
| OMC | SX-RT1 | 1994 and newer | 3863090 | |
| OMC | SX-RT2 | 1994 and newer | 3863090 | |
| OMC | DP-S | 1994 and newer | 3863090 | |
| OMC | DP-S1 | 1994 and newer | 3863090 | |
| OMC | SX-C1AC | 1994 and newer | 3863090 | |
| OMC | SX-M | 1994 and newer | 3863090 | Also SX-M 1.43, 1.51, 1.60, 1.66, 1.79, 1.89, 1.97 and 2.18 |
| OMC | SX-MTD | 1994 and newer | 3863090 | Also SX-MTD 1.66 and 1.79 |
| OMC | SX-MTD3 | 1994 and newer | 3863090 | |
| OMC | SX-A | 1994 and newer | 3863090 | Also SX-A 1.43, 1.51, 1.60, 1.66, 1.79, 1.89 and 1.97 |
| Volvo Penta | SX | Model-dependent | 3863090 | |
| Volvo Penta | DPS-A | Model-dependent | 3863090 | Also DPS-A OXi |
| Volvo Penta | DPS-B | Model-dependent | 3863090 | Also DPS-B OX |
| Volvo Penta | DPS-B1 | Model-dependent | 3863090 | Also DPS-B1 OX |
Technical Specs
- Product Type
- Propeller shaft oil seal
- Installation Location
- Lower-unit gearcase and propeller shaft carrier
- Housing Material
- Rubber with metal casing
- Housing Color
- Black
- Weight
- 50 g (0.11 lb)
- Warranty
- 1 year against manufacturing defects under normal use
What's in the Box
- 1 x Propeller shaft oil seal
- 1 x O-ring seal
- 1 x Gasket
- 1 x Cotter pin
Reference numbers associated with the included service components may include O-ring numbers 3852865, 0913849 and 0769363, and cotter-pin numbers 306394, 0019084, 3852056, 0335325 and 0765546. Compare the removed components with the supplied parts before installation.
Installation Notes
- Disconnect the battery cables and make sure the engine is off.
- Drain the gearcase lubricant into an approved container.
- Remove the propeller, then remove the propeller shaft housing carrier.
- Carefully remove the old oil seal from the carrier without scratching the metal bore.
- Clean the seal seat thoroughly and remove old sealant, debris and corrosion.
- Lightly lubricate the new seal's inner and outer surfaces with suitable marine grease or gear lubricant.
- Using a suitable seal driver or socket with the correct outside diameter, press the seal in squarely until properly seated.
- Reinstall the propeller shaft carrier with the O-ring and gasket correctly positioned.
- Reinstall the propeller and its retaining hardware, including the supplied cotter pin where applicable.
- Refill the gearcase with the manufacturer-recommended lubricant to the correct level.
- Check the seal area for leaks before returning the boat to service.
Troubleshooting & FAQ
How do I confirm fitment?
Compare the part number on the old seal or in the service manual with the Part Number Matrix, then confirm the complete stern-drive model, year and serial information. Model names alone may not establish fitment.
What are the signs of a failing propeller shaft seal?
Common signs include gear oil around the propeller shaft, water contamination that makes the lubricant look milky or creamy, or a recurring low lubricant level in the lower unit.
Is a special tool required?
A seal driver or socket with a matching outside diameter is strongly recommended to install the seal evenly without damaging its metal casing or sealing lip.
When should the seal be replaced?
Inspect the seal during lower-unit service and replace it when damaged, leaking or whenever the gearcase is disassembled and the seal cannot be reused confidently.
Is this an OEM part?
No. This listing is for an aftermarket replacement. The listed OEM and aftermarket numbers are reference numbers for fitment comparison and are not a statement that the product is manufactured by OMC or Volvo Penta.
What are the shipping and warranty terms?
Typical transit is 5–15 days, with standard shipping available at no additional charge where offered. The product is covered by a 1-year warranty against manufacturing defects under normal use. Returns are accepted according to the applicable store policy for unused products in their original condition.
Safety & Important Information
- Verify the part number, drive model, year and serial information before ordering.
- Compare the supplied parts with the original components before installation.
- Use the correct lubricant and follow the stern-drive manufacturer's service procedure.
- Professional installation is recommended when removing or servicing the lower unit.
- This is an aftermarket replacement, not an OEM component.
About Sea Sierra
- Pro-Grade Standards: Marine replacement parts selected for dependable service and consistent fit.
- Fast Global Fulfillment: Standard delivery is available to most regions where offered.
- Manufacturer-Direct Value: Competitive pricing with attention to materials and quality control.
Payment & Security
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
