Exhaust Bellow – Fits Volvo Penta SX/DP-S/DP-SM & OMC Cobra Stern Drives (Replaces 3850426)
Exhaust Bellow – Fits Volvo Penta SX/DP-S/DP-SM & OMC Cobra Stern Drives (Replaces 3850426) 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
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Exhaust Bellow – Fits Volvo Penta SX/DP-S/DP-SM & OMC Cobra Ste...
Product Details
This aftermarket Exhaust Bellow – Fits Volvo Penta SX/DP-S/DP-SM & OMC Cobra Stern Drives (Replaces 3850426) creates a crucial seal between the stern drive and the transom assembly. It is compatible with a wide range of Volvo Penta V6/V8 engines using SX, DP-S, and DP-SM stern drives, as well as OMC Cobra stern drives manufactured from 1986–1993.
This part is a direct replacement for Volvo Penta 3850426, OMC 914036, Sierra 18-2764, and others. Please see the part number matrix for a complete list of interchanges.
- Engineered for direct-fit installation.
- Made from a durable rubber compound for marine environments.
- Comes as a comprehensive kit for a complete overhaul.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Volvo Penta | 3850426 |
| Volvo Penta | 3850426-2 |
| OMC | 914036 |
| Sierra | 18-2764 |
| Sierra | 18-1074 |
| GLM | 89190 |
| Mallory | 9-72711 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Volvo Penta applications, this bellow is compatible with SX, DP-S, and DP-SM series stern drives across various V6 and V8 engine displacements.
For OMC applications, this part fits Cobra stern drives on V6/V8 engines from 1986 through 1993.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Volvo Penta | SX Stern Drive | Various | 4-Stroke | All | 3850426 | Fits 3.0L, 4.3L, 5.0L, 5.7L engines |
| Volvo Penta | DP-S Stern Drive | Various | 4-Stroke | All | 3850426 | Fits V6/V8 engines |
| Volvo Penta | DP-SM Stern Drive | Various | 4-Stroke | All | 3850426 | Fits V6/V8 engines |
| Volvo Penta | 3.0L | 130-135 | 4-Stroke | All SX models | 3850426 | |
| Volvo Penta | 4.3L | 205-225 | 4-Stroke | All SX models | 3850426 | |
| Volvo Penta | 5.0L | 220-270 | 4-Stroke | All SX models | 3850426 | |
| Volvo Penta | 5.7L | 260-320 | 4-Stroke | All SX models | 3850426 | |
| Volvo Penta | 5.8L | Various | 4-Stroke | All SX models | 3850426 | |
| Volvo Penta | 7.4L | 310-330 | 4-Stroke | All SX models | 3850426 | |
| Volvo Penta | 8.2L | Various | 4-Stroke | All SX models | 3850426 | |
| OMC | Cobra | Various | 4-Stroke | 1986–1993 | 914036 | Fits V6/V8 engines |
Technical Specs
- Product Type
- Exhaust Bellow
- Installation
- Direct replacement
- Connection
- Stern drive to transom assembly
- Housing Material
- Rubber/synthetic compound
- Housing Color
- Black
- Weight
- 100g (0.22 lb)
- Fitting Type
- Direct fit
- Warranty
- 1 Year (aftermarket)
- Other Technical Attributes
- OEM specifications; ISO9002 certified manufacturing
What’s in the Box
This is a complete bellows assembly kit. Some retailers may sell the bare exhaust bellow separately.
- 1 x Exhaust Bellow (AM3850426)
- 1 x U-Joint Bellow (AM3841481)
- 2 x O-Ring (AM25-30613)
- 1 x O-Ring (AM3852045)
- 1 x O-Ring (AM955981)
- 1 x Anode Kit Aluminum (CMSXKITA)
- 1 x Pin (AM3852056)
- 1 x Rubber Seal (AM3852560)
- 1 x Gasket (AM3855081)
Installation Notes
The following are generic steps. Always consult your official service manual for detailed procedures specific to your stern drive model.
- Disconnect the boat's battery and take appropriate safety precautions.
- Tilt the stern drive to the full 'up' or 'trailer' position for access.
- Loosen and remove the clamps securing the old exhaust bellow to the transom and the stern drive.
- Carefully pry the old bellow off both mounting surfaces. Note its orientation.
- Thoroughly clean the mounting surfaces on the transom and drive to ensure a clean seal.
- Fit the new bellow into position, ensuring it is properly seated on both ends.
- Secure the bellow with new hose clamps, tightening them to the manufacturer's specified torque. Do not overtighten.
- Lower the drive and inspect the seal. Once confirmed, reconnect the battery and test for leaks in the water.
Troubleshooting & FAQ
How do I know if my exhaust bellow is failing?
Common signs of a worn or failed exhaust bellow include visible cracks or splits in the rubber, water leaking into the bilge from the transom area, or a noticeable increase in exhaust volume at the stern of the boat.
Will this fit my specific engine year?
This bellow fits all years for the specified Volvo Penta SX, DP-S, and DP-SM drives, and OMC Cobra drives from 1986–1993. The most reliable way to confirm fitment is to match your existing part number to one of the equivalents listed in our Part Number Matrix.
What is the difference between an exhaust bellow and a U-joint bellow?
The exhaust bellow provides a sealed passage for engine exhaust to exit through the stern drive. The U-joint (or driveshaft) bellow protects the universal joints and driveshaft from water intrusion. Both are critical for stern drive integrity, and this kit includes both components.
How often should I replace my stern drive bellows?
As a preventative maintenance measure, it is recommended to inspect all bellows annually for signs of wear, such as cracking, stiffness, or rot. Full replacement is typically advised every 3-5 years, depending on usage and water conditions (saltwater vs. freshwater).
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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