Exhaust Bellow for Volvo Penta SX Drives 1994-Up and OMC Cobra Cone-Clutch Stern Drives – Replaces 3850426
Exhaust Bellow for Volvo Penta SX Drives 1994-Up and OMC Cobra Cone-Clutch Stern Drives – Replaces 3850426 is backordered and will ship as soon as it is back in stock.
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Exhaust Bellow for Volvo Penta SX Drives 1994-Up and OMC Cobra Cone...
Exhaust Bellow for Volvo Penta SX Drives 1994-Up and OMC Cobra Cone-Clutch Stern Drives – Replaces 3850426 is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket exhaust bellow is a single replacement component for specified Volvo Penta SX stern drives from 1994 and newer and OMC Cobra cone-clutch stern-drive applications. It provides the flexible exhaust passage between the stern drive and transom assembly and helps maintain a sealed, correctly routed exhaust connection.
The bellow replaces Volvo Penta 3850426 and 3850426-2. This listing also lists OMC Cobra references 914036 and 767724, Sierra Marine 18-1074, and Mallory Marine 9-72711 as related references. Match the reference number, drive type, and physical dimensions before ordering.
- Single exhaust bellow; this listing is not a complete bellows-service kit.
- Designed for the specified Volvo Penta SX and OMC Cobra cone-clutch applications.
- Flexible rubber construction for stern-drive exhaust service.
- Replacement-style installation using the correct clamps and service procedure for the drive.
Part Number Matrix
Use these manufacturer and aftermarket references as identification aids. They are not a substitute for confirming the exact stern-drive application.
| Brand | Part Number | Reference Type |
|---|---|---|
| Volvo Penta | 3850426 | OEM reference |
| Volvo Penta | 3850426-2 | OEM reference |
| OMC Cobra | 914036 | OEM reference |
| OMC Cobra | 767724 | OEM reference |
| Sierra Marine | 18-1074 | Aftermarket reference |
| Mallory Marine | 9-72711 | Aftermarket reference |
Engine & Model Compatibility
Fitment depends on the stern-drive design and clutch configuration rather than engine horsepower alone. Confirm the drive model, year, existing reference number, and bellow dimensions before installation.
| Brand | Stern Drive / Application | Year Condition | Reference | Fitment Notes |
|---|---|---|---|---|
| Volvo Penta | SX stern drives | 1994 and newer | 3850426 / 3850426-2 | Listed application. Catalog evidence also identifies the exhaust bellow for SX drive applications from 1994–1998. |
| OMC Cobra | Cone-clutch Cobra stern drives | 1994 and newer | 914036 / 767724 | For cone-clutch applications that do not use the earlier exhaust boot design. |
Important: Do not apply the OMC fitment to all Cobra drives. Catalog information distinguishes the cone-clutch exhaust bellow from the exhaust bellows used on earlier clutch-dog Cobra models.
Technical Specs
- Product Type
- Exhaust bellow
- Product Configuration
- Single replacement component
- Application
- Volvo Penta SX and specified OMC Cobra cone-clutch stern drives
- Material
- Flexible rubber compound
- Color
- Black
- Approximate Dimensions
- Inside diameter 2 5/8 in × outside diameter 3 in × length 7.5 in
- Installation
- Replacement installation; use the correct clamps and follow the service procedure for the specific drive
- OEM References
- Volvo Penta 3850426, 3850426-2; OMC Cobra 914036, 767724
- Aftermarket References
- Sierra Marine 18-1074; Mallory Marine 9-72711
What’s in the Box
This listing is for the exhaust bellow only.
- 1 × Exhaust bellow
Clamps, U-joint bellows, shift-cable bellows, gaskets, seals, bearings, anodes, pins, and other service-kit components are not included unless separately stated with your order.
Installation Notes
The following are general replacement guidelines. Always use the official service manual for the exact stern-drive model and observe all applicable safety procedures.
- Disconnect the boat battery and secure the boat before beginning work.
- Position the stern drive for safe access according to the service manual.
- Remove the clamps and detach the old exhaust bellow from the transom and stern drive.
- Inspect the mounting surfaces, clamp areas, and adjacent bellows for corrosion, damage, or contamination.
- Clean the mating surfaces and compare the replacement bellow with the removed part before installation.
- Install the new bellow in the correct orientation and fully seat both ends on their mounting surfaces.
- Install suitable clamps and tighten them to the manufacturer’s specified torque. Do not overtighten.
- Complete the service-manual inspection and leak check before returning the boat to service.
Troubleshooting & FAQ
How do I know if my exhaust bellow needs replacement?
Inspect for cracks, splits, hardening, distortion, loose ends, clamp damage, or signs of exhaust or water leakage around the stern-drive and transom area. Replace a bellow that is damaged or no longer seals correctly.
Will this fit every Volvo Penta SX drive?
The listed Volvo Penta application is SX drives from 1994 and newer. Confirm the exact drive year, reference number, and dimensions before ordering; do not assume that every Volvo Penta drive uses this bellow.
Will this fit every OMC Cobra stern drive?
No. The documented OMC application is for cone-clutch Cobra stern drives using the exhaust-bellow design associated with references 914036 and 767724. Earlier clutch-dog Cobra models may use a different exhaust bellow or exhaust boot.
Is this a complete bellows kit?
No. This product is one exhaust bellow only. It does not include a U-joint bellow, shift-cable bellow, gimbal bearing, seals, gaskets, anode, pins, or other overhaul components.
What is the difference between an exhaust bellow and a U-joint bellow?
The exhaust bellow routes exhaust through the stern-drive assembly. A U-joint bellow protects the driveshaft and universal-joint area from water intrusion. They are separate components and are not interchangeable.
Is this an OEM component?
This listing is for an aftermarket replacement. Volvo Penta and OMC part numbers are provided only as identification and compatibility references.
Safety & Important Information
- Verify the stern-drive model, year, clutch design, existing part number, and dimensions before purchase.
- Do not use this bellow on an application that requires an exhaust boot or a different bellows design.
- Do not assume that related service-kit components are included; this listing contains one exhaust bellow only.
- Professional installation is recommended when stern-drive service experience or the correct service manual is not available.
About Sea Sierra
- Marine Replacement Parts — We supply aftermarket components for maintenance and repair of marine systems.
- Application-Focused Information — Product references and fitment details are provided to help you verify the correct replacement before ordering.
- Service-Minded Support — Match the original component and stern-drive configuration carefully for the best installation result.
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