Exhaust Hose Bellows, 4-Inch Inside Diameter – Fits OMC Cobra and Volvo Penta Stern Drives, Replaces 3852741 and 3863450
Exhaust Hose Bellows, 4-Inch Inside Diameter – Fits OMC Cobra and Volvo Penta Stern Drives, Replaces 3852741 and 3863450 is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
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Exhaust Hose Bellows, 4-Inch Inside Diameter – Fits OMC Cobra and V...
Exhaust Hose Bellows, 4-Inch Inside Diameter – Fits OMC Cobra and Volvo Penta Stern Drives, Replaces 3852741 and 3863450 is backordered and will ship as soon as it is back in stock.
Product Details
This replacement exhaust hose bellows is designed for selected OMC Cobra and Volvo Penta stern-drive applications. It has a 4-inch inside diameter and is listed as a replacement for OMC part number 3852741 and Volvo Penta part number 3863450.
Use the original part number, engine model, and drive configuration to confirm compatibility before ordering. This listing is for one replacement exhaust hose bellow; clamps, adhesive, and other installation hardware are not included unless specifically stated by the seller.
- Product type: Exhaust hose bellow
- Inside diameter: 4 inches
- Application: OMC Cobra and Volvo Penta stern/out-drive systems
- Installation: Replacement component for the original exhaust bellow
Part Number Cross-Reference
The following customer-facing manufacturer and aftermarket references are associated with this replacement. Cross-reference numbers should be used together with the complete engine and drive fitment information.
| Brand or reference | Part number |
|---|---|
| OMC / Evinrude Johnson BRP | 3852741 |
| OMC / Evinrude Johnson BRP | 778067 |
| Volvo Penta | 3863450 |
| Volvo Penta replacement reference | 0763891 |
| Mallory Marine | 9-72800 |
| GLM | 89222 |
| Sierra Marine | 18-2780-1 |
Engine Compatibility
This listing covers this exhaust hose bellow for the following engine models. Confirm the engine model and stern-drive configuration before installation.
| Engine family | Listed models |
|---|---|
| OMC Cobra / Volvo Penta stern-drive applications | 3.0L GL, GS, GI, GLM, GLP, GSM, GSP, GS; 4.3L GL, GS, GI, GXI, OSI; 5.0L FL, FI, GL, GXI, OSI; 5.7L GL, GI, GXI, OSI, OSXI, GIL, GXIL; 5.8L FL, FI, FSI; 7.4L GL, GI, GSI; 8.2L GSI |
Important: The model list is not a universal fitment statement for every engine or drive in these displacement families. Verify the original part number and the physical dimensions before ordering.
Technical Specifications
- Product type
- Exhaust hose bellow
- Inside diameter
- 4 inches
- Application
- OMC Cobra and Volvo Penta stern/out-drive systems
- Primary replacement references
- 3852741 and 3863450
- Quantity
- 1 exhaust hose bellow
What's in the Box
- 1 x Exhaust hose bellow
Clamps, adhesive, gaskets, and other hardware are not included unless shown or expressly listed as part of the purchase.
Installation Notes
- Turn off the engine, disconnect the battery, and allow the exhaust system to cool completely.
- Position the stern drive as directed by the applicable service procedure and ensure the work area is safely accessible.
- Remove the clamps and carefully remove the old exhaust bellow.
- Inspect the mating surfaces, remove old rubber or sealant residue, and check the clamps for serviceability.
- Compare the replacement bellow with the original part, including the inside diameter and orientation.
- Install the new bellow fully onto both mating surfaces and position the clamps correctly.
- Tighten the clamps according to the engine or drive manufacturer's service instructions. Do not overtighten.
- Reconnect the battery, run the engine only after the installation is complete, and check the connections for exhaust or water leaks.
Professional installation is recommended when access to the stern drive is restricted or when the correct service procedure is uncertain.
Maintenance and Troubleshooting
How do I confirm that this bellow fits?
Match the original part number to the cross-reference table, confirm the 4-inch inside diameter, and verify the complete engine model and stern-drive configuration. If the original part, dimensions, or connection style differ, do not rely on engine displacement alone.
What are common signs of a damaged exhaust bellow?
Inspect for cracks, splitting, hardening, abrasion, loose connections, unusual exhaust noise, water near the connection area, or exhaust fumes in the engine compartment or vessel. Replace the bellow if damage is found.
How often should the bellow be inspected?
Inspect the bellow during routine stern-drive maintenance and whenever the drive is serviced. Actual replacement timing depends on operating conditions, installation quality, and visible wear.
Are clamps included?
No. The package is one exhaust hose bellow. Existing clamps should be inspected and replaced separately if worn, damaged, or unsuitable.
Is this an OEM part?
This listing is for a replacement part. The referenced OEM and aftermarket numbers are provided for identification and compatibility comparison; the replacement should not be represented as a genuine OEM-branded component.
Safety and Important Information
- Verify the original part number, inside diameter, engine model, and stern-drive configuration before ordering.
- Do not operate the engine if the exhaust bellow is cracked, loose, or leaking.
- Follow the applicable manufacturer service manual for lifting, drive positioning, clamp torque, sealant, and safety procedures.
- Professional installation is recommended for critical exhaust-system work.
About Sea Sierra
- Marine Replacement Parts — We supply replacement components for common marine engine and stern-drive service applications.
- Fitment-Focused Listings — Product references and application information are provided to help you compare the original component before ordering.
- Practical Support — When fitment is uncertain, provide the engine model, drive model, serial information, and original part number before purchase.
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