Exhaust Bellow – Fits Volvo Penta & OMC Cobra 2.3L-8.1L V4/V6/V8 Engines (Replaces 3863450, 3852741)
Exhaust Bellow – Fits Volvo Penta & OMC Cobra 2.3L-8.1L V4/V6/V8 Engines (Replaces 3863450, 3852741) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Exhaust Bellow – Fits Volvo Penta & OMC Cobra 2.3L-8.1L V4/V6/V...
Product Details
This OEM-quality Exhaust Bellow – Fits Volvo Penta & OMC Cobra 2.3L-8.1L V4/V6/V8 Engines (Replaces 3863450, 3852741) is a direct replacement for original equipment on specific Volvo Penta and OMC Cobra marine drive units. It is designed for Volvo Penta 2.3L–8.1L engines from 1986–1991 and OMC Cobra 2.3L–5.8L engines from 1987–1991.
It serves as a direct interchange for Volvo Penta parts 3863450 and 3852742, OMC parts 3852741, 3852742, 0778066, 0912376, and 0913592, and several aftermarket equivalents.
- Method: Direct OEM-style replacement installation.
- Environment: Designed for marine saltwater and freshwater conditions.
- Housing: Constructed from durable, marine-grade rubber.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Volvo Penta | 3863450 |
| Volvo Penta | 3852742 |
| OMC | 3852741 |
| OMC | 3852742 |
| OMC | 0778066 |
| OMC | 0912376 |
| OMC | 0913592 |
| Sierra | 18-2780-1 |
| GLM | 89222 |
| Mallory | 9-72800 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
Volvo Penta Fitment: Primarily for sterndrive models from 1986 to 1991.
| Brand | Model | Stroke | Years | OEM Part No. |
|---|---|---|---|---|
| Volvo Penta | 2.3L | 4-Stroke | 1987–1988 | 3863450 |
| Volvo Penta | 2.5L | 4-Stroke | 3863450 | |
| Volvo Penta | 3.0L | 4-Stroke | 3863450 | |
| Volvo Penta | 4.3L | 4-Stroke | 1987–1989 | 3863450 |
| Volvo Penta | 5.0L | 4-Stroke | 3863450 | |
| Volvo Penta | 5.7L | 4-Stroke | 1986, 1987–1991 | 3863450 |
| Volvo Penta | 5.8L | 4-Stroke | 3863450 | |
| Volvo Penta | 7.4L | 4-Stroke | 3863450 | |
| Volvo Penta | 8.1L | 4-Stroke | 3863450 |
OMC Cobra Fitment: Primarily for sterndrive models from 1987 to 1991.
| Brand | Model | Stroke | Years | OEM Part No. |
|---|---|---|---|---|
| OMC Cobra | 2.3L | 4-Stroke | 1989–1991 | 3852741 |
| OMC Cobra | 4.3L | 4-Stroke | 1987–1989 | 3852741 |
| OMC Cobra | 5.0L | 4-Stroke | 3852741 | |
| OMC Cobra | 5.7L | 4-Stroke | 1989–1991 | 3852741 |
| OMC Cobra | 5.8L | 4-Stroke | 3852741 |
Technical Specs
- Product Type
- Exhaust Bellow/Hose
- Installation
- Direct OEM Replacement
- Connection
- Hose Coupler/Bellow
- Housing Material
- Marine-Grade Rubber
- Housing Color
- Black
- Fitting Type
- Exhaust Coupler
- Other Technical Attributes
- ISO9002 Certified Manufacturing
What’s in the Box
- 1 x Exhaust Bellow (Replaces 3863450/3852741)
Installation Notes
- Ensure the engine is off and the battery is disconnected. Trim the sterndrive unit to the full "up" or "trailer" position for access.
- Locate the old exhaust bellow connecting the transom assembly to the sterndrive.
- Loosen and remove the hose clamps at both ends of the bellow.
- Carefully pry the old bellow off the mounting flanges. Clean the flange surfaces of any old adhesive or rubber residue.
- Position the new exhaust bellow, ensuring it is oriented correctly.
- Secure the new bellow by tightening the hose clamps at both ends to the manufacturer's recommended torque. Do not overtighten.
- Lower the drive, reconnect the battery, and start the engine. Check for exhaust leaks around the new bellow connections.
Troubleshooting & FAQ
How do I know if this bellow fits my specific engine model?
The best way is to match your engine's original part number to the cross-reference numbers in our Part Number Matrix. Additionally, check your engine model and year against the compatibility tables provided. If you are uncertain, please contact us with your drive's model and serial number before ordering.
What are the signs of a failing exhaust bellow?
Common signs include visible cracks, splitting, or perishing of the rubber; an increase in exhaust noise from the engine bay; water leaking into the bilge area from the transom shield; or exhaust fumes detected inside the boat.
How often should an exhaust bellow be replaced?
There is no fixed interval, but exhaust bellows should be inspected annually for signs of wear, cracking, or damage. Replacement is recommended as part of routine sterndrive maintenance every 3-5 years, or immediately if any signs of failure are present. Lifespan can vary based on usage, climate, and water conditions.
Is any special adhesive required for installation?
While some mechanics use a light application of bellows adhesive on the mounting flanges for a better seal, it is not always required if the surfaces are clean and the clamps are torqued correctly. Follow the recommendations in your engine's service manual.
Can I install this myself?
While installation can be done by an experienced DIY boater, it requires accessing a critical part of the sterndrive. We recommend professional installation to ensure a proper, leak-free seal, which is critical for preventing water from entering the vessel.
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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