Exhaust Hose Bellows – Fits OMC & Volvo Penta Sterndrive (Replaces 3863450, 3852741)
Exhaust Hose Bellows – Fits OMC & Volvo Penta Sterndrive (Replaces 3863450, 3852741) is backordered and will ship as soon as it is back in stock.
Couldn't load pickup availability
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 Hose Bellows – Fits OMC & Volvo Penta Sterndrive (Repla...
Product Details
This Exhaust Hose Bellows – Fits OMC & Volvo Penta Sterndrive Engines is a direct-fit replacement for a wide range of OMC Cobra and Volvo Penta sterndrive engines. It's designed for 4-cylinder, V6, and V8 models from 2.3L to 8.1L, covering years from 1986 to 1994 and beyond.
It directly replaces OEM part numbers including OMC 3852741, 911741, and 913591, as well as Volvo Penta 3863450 and 3852741. Aftermarket interchanges include Sierra 18-2780, GLM 89222, and Mallory 9-72800.
- Engineered for gasoline sterndrive applications connecting the lower exhaust coupler between the riser and elbow.
- Made from high-grade CR (Chloroprene) rubber for durability and resistance to exhaust heat and marine environments.
- Installs securely with the two included stainless steel hose clamps.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| OMC | 3852741 |
| OMC | 911741 |
| OMC | 913591 |
| Volvo Penta | 3863450 |
| Volvo Penta | 3852741 |
| Sierra | 18-2780 |
| Sierra | 18-2780-1 |
| GLM | 89222 |
| Mallory | 9-72800 |
| Mallory | 9-72814 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For OMC & Volvo Penta Sterndrives: This part is designed for a broad range of models. Note that for some early production 5.7L GM engines, the original bellows featured a "lump" or bulge. Please visually verify your part before ordering to ensure a correct match.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| OMC/Volvo Penta | 2.3L | 115–130 | 4-Stroke | 1989–1990 | 3852741/3863450 | Stern Drive |
| OMC/Volvo Penta | 2.5L | 4-Stroke | 1986 only | 3852741/3863450 | Stern Drive | |
| OMC/Volvo Penta | 3.0L | 130–140 | 4-Stroke | 1986–1991 | 3852741/3863450 | GL, GS, GI, GLM, GLP, GSM, GSP models |
| OMC/Volvo Penta | 4.3L | 160–225 | 4-Stroke | 1990–1991 | 3852741/3863450 | GL, GS, GI, GXI, OSI models |
| OMC/Volvo Penta | 5.0L (Ford) | 4-Stroke | 1991 only | 3852741/3863450 | FL, FI, GL, GXI, OSI models | |
| OMC/Volvo Penta | 5.7L (GM) | 235–300 | 4-Stroke | Various | 3852741/3863450 | Early production only with "lump" in bellows |
| OMC/Volvo Penta | 5.8L (Ford) | 4-Stroke | 1991 only | 3852741/3863450 | FL, FI, FSI models | |
| OMC/Volvo Penta | 7.4L | 300+ | 4-Stroke | Various | 3852741/3863450 | GL, GI, GSI models |
| OMC/Volvo Penta | 8.1L/8.2L | 400+ | 4-Stroke | Various | 3852741/3863450 | GSI models |
Technical Specs
- Product Type
- Exhaust Hose Bellows
- Application
- Gasoline Sterndrive Engines
- Connection
- Lower exhaust coupler/connector between riser and elbow
- Housing Material
- CR (Chloroprene) Rubber
- Housing Color
- Black
- Internal Dimensions
- 3.5" I.D. x 5.5" Long (89mm x 140mm)
- Box Dimensions
- 23 x 15 x 13 cm
- Weight
- 0.53 kg (1.15 lbs)
- Fitting Type
- Hose clamp
- Design
- Designed to meet or exceed OEM specifications
What’s in the Box
- 1 x Exhaust Hose Bellows (Replaces 3863450, 3852741)
- 2 x Stainless Steel Hose Clamps
Installation Notes
- Disconnect the battery and ensure the engine is cool. Gain safe and clear access to the sterndrive's exhaust system.
- Locate the old exhaust bellows connecting the riser assembly to the lower exhaust pipe.
- Loosen and remove the hose clamps at both ends of the old bellows. A nut driver or socket is typically required.
- Carefully pry the old bellows off both connection points. Clean any old sealant or rubber residue from the mounting surfaces.
- Slide the new hose clamps over the new bellows.
- Position the new bellows and slide each end onto its respective connection point, ensuring it is fully seated.
- Tighten the new stainless steel hose clamps securely at both ends. Do not overtighten, but ensure a firm, leak-proof seal.
- Reconnect the battery, run the engine on a water supply, and inspect carefully for any exhaust or water leaks.
Troubleshooting & FAQ
How do I know if this bellows is the right one for my engine?
The best way is to match your engine's original part number to one listed in our Part Number Matrix. Also, check your engine model and year against the compatibility table. For 5.7L GM engines, visually inspect your old part; some early models had a bellows with a distinct "lump" or bulge, which differs from this part.
What are the signs of a failing exhaust bellows?
Common signs include water entering the bilge area (especially when trimmed up), the smell of exhaust fumes in the engine compartment, an audible exhaust leak, or visible cracking, splitting, or perishing of the rubber itself during inspection.
How often should I replace my exhaust bellows?
Exhaust bellows are a regular maintenance item. While there's no fixed interval, they are often replaced every 3-5 years as part of a comprehensive sterndrive service, or whenever the drive is removed for other maintenance. Inspect annually and replace immediately if you see signs of wear or damage.
Can I install this part myself?
Installation is possible for an experienced DIY mechanic with proper tools and service manuals. However, it can be a difficult job requiring access to the back of the engine. For safety and to prevent leaks, we recommend professional installation.
What is the difference between this aftermarket bellows and an OEM one?
This is a direct aftermarket replacement, not an original OEM part. It is manufactured in an ISO 9002 certified facility using high-quality materials (CR Rubber) designed to meet or exceed OEM specifications for fit, function, and durability, offering comparable performance at better value.
How fast is shipping and what does it cost?
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free on most orders; any available expedited options and their costs will be displayed at checkout.
What is the warranty and return policy?
This product is covered by a 1-year warranty against manufacturing defects under normal marine use. If you encounter an issue, please contact our support team with your order details. Returns are accepted within our standard window for unused items in their original condition. See our policy page or reach out for instructions.
Safety & Important Info
- Verify images and specifications against your original part before purchase. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement part, not an OEM component. Brand names and part numbers are used for reference purposes only.
- Professional installation is strongly recommended for safety, proper function, and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and batch-inspected for real-world reliability.
- Fast Global Fulfillment — We offer free standard delivery to most regions, with an average transit time of 5–15 days.
- Manufacturer-Direct Value — By working directly with our manufacturing partners, we provide fair pricing without compromising on materials or quality control.
Payment & Security
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
