Exhaust Hose Bellow – Fits Volvo Penta & OMC Cobra 2.3L-8.2L (Replaces 3852741, 3863450)
Exhaust Hose Bellow – Fits Volvo Penta & OMC Cobra 2.3L-8.2L (Replaces 3852741, 3863450) is backordered and will ship as soon as it is back in stock.
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Exhaust Hose Bellow – Fits Volvo Penta & OMC Cobra 2.3L-8.2L (R...
Product Details
This Exhaust Hose Bellow – Fits Volvo Penta & OMC Cobra 2.3L-8.2L Engines (Replaces 3852741, 3863450) connects the exhaust system between engine components on various Volvo Penta and OMC Cobra sterndrives. It is designed for gasoline engines manufactured between 1986 and 1991, covering sizes from 2.3L to 8.2L.
It serves as a direct replacement for OMC 3852741, Volvo Penta 3863450, Sierra 18-2780-1, GLM 89222, and Mallory 9-72800.
- Designed for a direct compression fit using hose clamps.
- Made from durable CR (Chloroprene) rubber to withstand the marine environment.
- Connects the lower exhaust elbow to the exhaust manifold or riser.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| OMC | 3852741 |
| Volvo Penta | 3863450 |
| Sierra | 18-2780-1 / 18-27801 |
| GLM | 89222 |
| Mallory | 9-72800 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For OMC models, this part acts as the lower exhaust hose for various Cobra engines from 1986 to 1991.
For Volvo Penta models, this part cross-references to the OMC equivalent for SX drives from 1994 to 1998.
| Brand | Model | Engine Size | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| OMC | Cobra | 2.3L | 4-Stroke | 1989–1990 | 3852741 | Lower exhaust hose |
| OMC | Cobra | 2.5L | 4-Stroke | 1986 | 3852741 | Lower exhaust hose |
| OMC | Cobra | 3.0L | 4-Stroke | 1986–1991 | 3852741 | Lower exhaust hose |
| OMC | Cobra | 4.3L | 4-Stroke | 1990–1991 | 3852741 | Lower exhaust hose |
| OMC | Cobra | 5.0L (Ford) | 4-Stroke | 1991 | 3852741 | Lower exhaust hose |
| OMC | Cobra | 5.7L (GM early) | 4-Stroke | Early 1986 | 3852741 | Lower exhaust hose |
| OMC | Cobra | 5.8L (Ford) | 4-Stroke | 1991 | 3852741 | Lower exhaust hose |
| Volvo Penta | SX | 3.0L-5.8L | 4-Stroke | 1994–1998 | 3863450 | Cross-reference to OMC |
Technical Specs
- Product Type
- Exhaust Hose Bellow (Lower)
- Installation
- Direct fit between exhaust components
- Fuel Type
- Gasoline engines
- Connection
- Internal Diameter 3.5" to 3.5" (89mm to 89mm)
- Housing Material
- CR (Chloroprene) Rubber
- Housing Color
- Black
- Dimensions
- Length: 4.25"-4.44" (108-113mm), ID: 3.5"-3.625" (89-92mm), OD: ~4.06" (103mm)
- Weight
- 0.53 kg (1.17 lb)
- Fitting Type
- Compression fit with hose clamps
- Warranty
- 1 Year
- Other Technical Attributes
- Lower exhaust hose; connects from exhaust elbow to exhaust manifold or riser
What’s in the Box
- 1 x Exhaust Bellow Hose (3852741/3863450)
- 2 x Stainless Steel Hose Clamps
Installation Notes
- Ensure the engine is off and cool. Disconnect the battery for safety.
- Locate the old lower exhaust bellow hose between the exhaust elbow and manifold.
- Loosen and remove the hose clamps securing the old bellow.
- Carefully work the old bellow off both connection points. Clean the surfaces of any residue.
- Slide the new stainless steel clamps over each end of the new bellow.
- Position the new bellow onto the connection points, ensuring it is fully seated.
- Tighten the hose clamps securely on both ends. Do not overtighten.
- Reconnect the battery, start the engine, and check for any exhaust leaks.
Troubleshooting & FAQ
Will this fit my 1992 OMC Cobra engine?
Based on our data, compatibility for most OMC Cobra applications ends in 1991. While it may fit, we cannot guarantee it for 1992 models. Always compare your old part to the pictures and dimensions provided before ordering.
What are the signs of a failing exhaust bellow?
Common signs include visible cracks, splits, or perishing of the rubber. You might also notice excessive exhaust fumes in the engine bay, a louder engine noise, or water leaking into the bilge from the exhaust system.
How often should I replace the exhaust bellow?
Exhaust bellows are a regular maintenance item. It is recommended to inspect them annually and replace them every 3-5 years, or immediately if any signs of wear or damage are found, especially in saltwater environments.
What makes CR (Chloroprene) rubber suitable for this part?
Chloroprene is a synthetic rubber known for its resistance to heat, oil, ozone, and water. This durability makes it an ideal material for marine exhaust components that are exposed to harsh conditions.
Is there a difference installing this on a Volvo Penta SX vs. an OMC Cobra?
The installation process is fundamentally the same, as the part serves the same function on both drive systems. However, access to the bellow and specific component arrangements may differ slightly. Always refer to a service manual for your specific drive model.
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.
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