Marine Exhaust Bellows Kit – 2 Upper Hoses and 2 Lower Hoses for OMC Cobra & Volvo Penta Stern Drives
Marine Exhaust Bellows Kit – 2 Upper Hoses and 2 Lower Hoses for OMC Cobra & Volvo Penta Stern Drives is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
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Marine Exhaust Bellows Kit – 2 Upper Hoses and 2 Lower Hoses for OM...
Marine Exhaust Bellows Kit – 2 Upper Hoses and 2 Lower Hoses for OMC Cobra & Volvo Penta Stern Drives is backordered and will ship as soon as it is back in stock.
Product Details
This marine exhaust bellows kit is designed for selected OMC Cobra and Volvo Penta stern-drive and out-drive applications. The kit includes four exhaust hoses: two upper hoses and two lower hoses. It is intended as a replacement set for renewing the upper and lower exhaust hose connections in the marine exhaust system.
The supplied upper hoses correspond to OEM reference 3852696, while the supplied lower hoses correspond to OEM reference 3863450. Catalog references identify 3852696 as an upper exhaust hose and 3863450 as an exhaust hose used with Volvo Penta applications. Always compare the hose position, dimensions, engine or drive model, and original part numbers before ordering.
- Complete four-piece exhaust hose kit for selected OMC Cobra and Volvo Penta stern-drive applications.
- Includes two upper hoses and two lower hoses.
- Supports replacement of worn, cracked, hardened, or deteriorated exhaust hoses.
- Designed for hose-clamp installation at the applicable exhaust connections; clamps are not specified as included in the company package data.
Part Number Matrix
The following references are manufacturer or aftermarket catalog numbers associated with the hose components in this kit. Reference numbers identify the component type and should not be treated as universal fitment for every engine or drive configuration.
| Position | Brand | Part Number | Reference |
|---|---|---|---|
| Upper exhaust hose | OMC / Volvo Penta | 3852696 | OEM reference |
| Upper exhaust hose | Sierra | 18-2779 | Catalog replacement reference for 3852696 |
| Lower exhaust hose | OMC / Volvo Penta | 3863450 | OEM reference supplied in the kit |
| Lower exhaust hose | OMC / Volvo Penta | 3852741 | Alternative lower-hose reference shown in catalogs; verify against the actual installation |
| Lower exhaust hose | Sierra | 18-2780-1 | Catalog replacement reference for 3852741 and 3863450 |
Engine & Model Compatibility
This kit is listed for OMC Cobra stern-drive or out-drive systems and Volvo Penta stern-drive or out-drive systems. Exact compatibility depends on the engine, drive configuration, hose position, model year, and serial-number range.
Catalog references for the related hoses include selected Volvo Penta applications such as GL, GS, GI, GXI, OSI, FI, FL, GIL, OSXI, FSI, and other configurations associated with 4.3L through 8.2L engine families. These references are application leads rather than confirmation for every engine in those displacement ranges. Confirm the exact original hose numbers and installation position before purchase.
| Brand | Drive or engine family | Hose positions supplied | Reference condition |
|---|---|---|---|
| OMC | Cobra stern drive / out drive | 2 upper and 2 lower hoses | Verify exact model, year, drive configuration, and serial range |
| Volvo Penta | Stern drive / out drive | 2 upper and 2 lower hoses | Verify exact model, year, drive configuration, and serial range |
| Volvo Penta | Selected GL, GS, GI, GXI, OSI, FI, FL, GIL, OSXI, and FSI applications | Upper and lower hose components | Catalog-based application lead; compare the original components before ordering |
Technical Specs
- Product Type
- Marine exhaust bellows and hose replacement kit
- Kit Configuration
- Four-piece kit: two upper exhaust hoses and two lower exhaust hoses
- Upper Hose Reference
- 3852696, two pieces supplied
- Lower Hose Reference
- 3863450, two pieces supplied
- Application
- Selected OMC Cobra and Volvo Penta stern-drive or out-drive systems
- Installation
- Hose-clamp connection at the applicable exhaust system locations
- Material
- Elastomeric exhaust hose material; exact compound is not specified in the company product record
- Color
- Black, subject to product appearance and production variation
- Clamps
- Not specified as included in the company package data
What’s in the Box
- 2 × Upper marine exhaust hoses corresponding to OEM reference 3852696
- 2 × Lower marine exhaust hoses corresponding to OEM reference 3863450
Installation Notes
- Turn off the engine, allow the exhaust system to cool completely, and disconnect the battery according to the manufacturer’s safety procedure.
- Confirm the upper and lower hose positions and compare the replacement hoses with the originals before removal.
- Gain clear access to the applicable exhaust hose connections on the stern drive or out-drive system.
- Loosen and remove the existing hose clamps. Replace damaged or corroded clamps with correctly sized marine-grade clamps if required.
- Remove the old hoses and clean the mating surfaces. Do not install a new hose over damaged, sharp, or contaminated connection surfaces.
- Install the two upper and two lower hoses in their correct positions. Make sure each hose is fully seated and not twisted, kinked, or under abnormal tension.
- Position the clamps over the proper sealing areas and tighten them to the engine or drive manufacturer’s specification.
- Reconnect the battery, run the engine according to the manufacturer’s procedure, and inspect the exhaust area for water, exhaust, or cooling-system leaks.
Troubleshooting & FAQ
What does this product include?
This product is a four-piece kit containing two upper exhaust hoses corresponding to 3852696 and two lower exhaust hoses corresponding to 3863450. Clamps are not specified as included in the company package information.
Is this a single exhaust bellows or a complete kit?
This product is a replacement kit rather than a single hose. It supplies two upper hoses and two lower hoses for the applicable OMC Cobra or Volvo Penta stern-drive or out-drive installation.
How do I confirm fitment?
Compare your original upper and lower hose numbers, hose positions, dimensions, engine or drive model, model year, and serial number with the information supplied by the engine or drive manufacturer. The presence of an OMC or Volvo Penta model family alone does not confirm fitment.
What are common signs of a failing exhaust hose?
Common signs include cracks, splits, hardened or brittle rubber, visible deterioration, water in the bilge, unusual exhaust noise, or evidence of an exhaust or cooling-water leak. Inspect all upper and lower hoses during routine service.
Should all four hoses be replaced together?
Replacing the complete set can help restore consistent condition across the upper and lower exhaust connections, but the correct service decision depends on the condition of the existing hoses and the requirements of your specific engine and drive system.
Do you offer expedited shipping?
Standard and expedited shipping options, where available for your location, are shown at checkout. Delivery times and available services vary by destination.
What is the warranty and return policy?
Warranty and returns are handled according to the applicable store policy. Contact customer support with your order details before returning or installing a product if you believe the kit is incorrect or damaged.
Safety & Important Info
- Confirm the exact hose position and part-number references before purchase. Upper and lower exhaust hoses are not interchangeable simply because they have similar appearance.
- Do not rely on engine displacement alone to determine fitment. Model, year, drive configuration, and serial-number conditions must be kept together.
- This is an aftermarket replacement kit and is not represented as an original equipment manufacturer component.
- Use correctly sized marine-grade clamps where required. Follow the engine and drive manufacturer’s installation and torque instructions.
- Professional installation is recommended for marine exhaust-system work. Inspect for exhaust and water leaks before returning the boat to service.
About Sea Sierra
- Marine Replacement Parts — We supply replacement components for common marine engine and stern-drive service applications.
- Application-Focused Support — Compare model details, original numbers, hose positions, and installation requirements before ordering.
- Global Fulfillment — Shipping options and delivery estimates are presented at checkout based on your destination.
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