Lower Exhaust Bellow – Fits OMC Cobra Stern Drive & Volvo Penta 2.3–5.8L Engines (Replaces 3852742)
Lower Exhaust Bellow – Fits OMC Cobra Stern Drive & Volvo Penta 2.3–5.8L Engines (Replaces 3852742) is backordered and will ship as soon as it is back in stock.
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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.).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Lower Exhaust Bellow – Fits OMC Cobra Stern Drive & Volvo Penta...
Product Details
This Lower Exhaust Bellow – Fits OMC Cobra Stern Drive & Volvo Penta 2.3–5.8L Engines (Replaces 3852742) is a direct replacement for OMC Cobra stern drives (2.3L to 8.2L) and Volvo Penta stern drives with inboard marine engines (5.0L to 8.2L).
It serves as a direct interchange for Volvo Penta part numbers 3852742, 912376, and 913592, as well as aftermarket cross-references Sierra 18-2781, Mallory 9-72801, and GLM 89230.
- Installs in the lower exhaust position on the stern drive.
- Constructed from high-grade rubber for durability in marine environments.
- Manufactured in an ISO9002 certified facility for quality assurance.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Volvo Penta | 3852742 |
| Volvo Penta | 912376 |
| Volvo Penta | 913592 |
| Sierra | 18-2781 |
| Mallory | 9-72801 |
| GLM | 89230 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Volvo Penta applications, this bellow is compatible with 5.0L, 5.7L, 5.8L, 7.4L, 8.1L, and 8.2L inboard engines.
For OMC Cobra applications, this bellow fits 2.3L, 2.6L, 4.3L, 4.6L, 5.0L, 5.7L, 5.8L, 7.4L, and 8.2L stern drive engines.
| Brand | Model | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|
| Volvo Penta | Inboard Marine | 4-Stroke | 3852742 | For engines: 5.0L 5.8L 7.4L 8.1L 8.2L |
| OMC | Cobra Stern Drive | 4-Stroke | 3852742 | For engines: 2.3L 2.6L 4.3L 4.6L 5.0L 5.7L 5.8L 7.4L 8.2L |
Technical Specs
- Product Type
- Exhaust Bellow
- Installation
- Lower exhaust position
- Housing Material
- Marine-grade rubber
- Housing Color
- Black
- Dimensions
- 4" diameter
- Fitting Type
- Hose connection
- Manufacturing Standards
- ISO9002 certified factory
What’s in the Box
- 1 x Lower Exhaust Bellow/Hose (3852742)
Installation Notes
- Ensure the engine is off and the battery is disconnected before starting.
- Gain clear access to the stern drive's lower exhaust bellow.
- Carefully loosen and remove the clamps securing the old bellow at both ends.
- Gently pry off and remove the old, worn bellow. Note its orientation.
- Thoroughly clean the mounting surfaces on the transom assembly and drive.
- Position the new bellow correctly and slide it into place.
- Securely fasten the new clamps on both ends, ensuring a watertight seal.
- Double-check that the clamps are tight and the bellow is not twisted or pinched.
- Reconnect the battery and test the engine, checking for any exhaust or water leaks.
Troubleshooting & FAQ
How do I know if my exhaust bellow needs to be replaced?
Signs of a failing bellow include visible cracks, splits, or perishing rubber. You may also notice an increase in exhaust noise at the stern or find water in the bilge area, which indicates a leak.
Will this part fit my specific engine model and year?
This bellow is designed for a wide range of OMC Cobra and Volvo Penta engines as listed. While exact year ranges are not available, it covers the most common models. Always verify by comparing your old part to our photos and listed part numbers.
Is this bellow resistant to saltwater?
Yes, it is made from high-quality, marine-grade rubber specifically formulated to resist degradation from saltwater, UV exposure, and engine heat.
Are installation clamps included with this part?
This product includes the bellow only. Hose clamps are not included and must be purchased separately or reused if your existing clamps are in good, corrosion-free condition.
What is the recommended replacement interval?
Exhaust bellows are a critical maintenance item. It is recommended to inspect them annually and replace them every 3-5 years, or immediately if you see any signs of wear, damage, or cracking.
What could happen if I don't replace a faulty bellow?
A failed exhaust bellow can allow water to enter your boat's transom and bilge, potentially causing catastrophic damage to the gimbal bearing, U-joints, and other critical stern drive components.
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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