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Exhaust Hose Bellow – Fits Volvo Penta & OMC Cobra 2.3L-8.2L Engines (Replaces 3852741, 3863450)
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Exhaust Hose Bellow – Fits Volvo Penta & OMC Cobra 2.3L-8.2L Engines (Replaces 3852741, 3863450)
This exhaust hose bellow is designed for Volvo Penta and OMC Cobra sterndrives, accommodating a wide range of engine sizes from 2.3L to 8.2L manufactured between 1986 and 1991. It serves as a crucial connection within the exhaust system, linking the exhaust elbow to the manifold or riser.
This component is a direct replacement for OMC part number 3852741 and Volvo Penta part number 3863450.
- Installation Method: Direct fit with included hose clamps.
- Material: Constructed from durable CR (Chloroprene) rubber for longevity.
- Package Includes: 1 x Exhaust Bellow Hose, 2 x Stainless Steel Hose Clamps.
Part Number Cross-Reference
Use this table to confirm equivalent part numbers across OEM and aftermarket brands.
| Brand | Part Number |
|---|---|
| OMC | 3852741 |
| Volvo Penta | 3863450 |
| Sierra | 18-2780-1 |
| Sierra | 18-27801 |
| GLM | 89222 |
| Mallory | 9-72800 |
Compatible Engine Models
Confirm your engine model/year in the table below.
| 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 Specifications
| Specification | Value |
|---|---|
| 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 |
Package Contents
- 1 x Exhaust Bellow Hose (Replaces 3852741/3863450)
- 2 x Stainless Steel Hose Clamps
Installation Guide
- Safety First: Disconnect the boat's battery and ensure the engine is completely cool before starting.
- Access the Area: Gain clear access to the sterndrive's exhaust components. This may require removing drive components or panels.
- Locate Old Bellow: Identify the old lower exhaust bellow connecting the exhaust elbow and manifold.
- Remove Clamps: Loosen and remove the hose clamps securing the old bellow at both ends.
- Remove Old Bellow: Carefully pry or cut the old bellow away from its connection points. Clean the surfaces of any old adhesive or rubber residue.
- Position New Bellow: Slide the new exhaust bellow into place, ensuring it is seated correctly on both exhaust components.
- Install New Clamps: Place the new stainless steel clamps over each end of the bellow.
- Secure Clamps: Tighten the clamps securely to create a watertight seal. Do not overtighten, which could damage the bellow.
- Final Check: Once installed, double-check that the bellow is straight and not twisted or pinched.
- Reconnect and Test: Reconnect the battery. After reassembly, run the engine with a water supply and check thoroughly for any exhaust or water leaks around the new bellow.
Troubleshooting & FAQ
Q: How do I confirm this exhaust bellow fits my engine?
A: The best way is to check your original part number against our cross-reference list, which includes OMC 3852741 and Volvo Penta 3863450. Also, compare your engine model and year with our compatibility table. Visually matching the dimensions and shape to your old part is also a reliable confirmation method.
Q: What are common signs that my exhaust bellow is failing and needs replacement?
A: Common signs of a failing exhaust bellow include visible cracks, splits, or perishing of the rubber. You may also notice water leaking into the bilge area, unusual exhaust noise, or exhaust fumes escaping into the engine compartment. Regular inspection is recommended.
Q: How often should this part be replaced?
A: Exhaust bellows are a regular maintenance item and should be inspected annually for signs of wear, cracking, or brittleness. Replacement intervals can vary based on usage (freshwater vs. saltwater) and storage conditions, but it is common to replace them every 3-5 years or as needed.
Q: OEM vs. Aftermarket?
A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.
Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.
Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.
Important Notes
- Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
- This product is an aftermarket replacement part and is not an OEM component.
- Professional installation is recommended to ensure safety and optimal performance.
Why Choose JLM MARINE?
- Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
- Fast Global Shipping: Free delivery worldwide in 5–15 days.
- Direct from Manufacturer: Competitive pricing without compromising quality.
We can ship to virtually any address in the world with free shipping available for most regions.
For our typical US and Canadian customers , our shipping timeframes are as follows:
- Amazon FBA: orders will be delivered within 1-5 business days after placing the order (during certain special periods such as major promotions, Christmas, etc., the delivery time of Amazon FBA may be affected).
- US warehouse shipment: orders will be delivered within 5 days after placing the order.
- China warehouse shipment: orders will be delivered about 12 days after placing the order.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
Founded in 2002, JLM Marine has established itself as a dedicated manufacturer of high-quality marine parts, based in China. Our commitment to excellence in manufacturing has earned us the trust of top marine brands globally.
As a direct supplier, we bypass intermediaries, which allows us to offer competitive prices without compromising on quality. This approach not only supports cost-efficiency but also ensures that our customers receive the best value directly from the source.
We are excited to expand our reach through retail channels, bringing our expertise and commitment to quality directly to boat owners and enthusiasts worldwide.
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