Upper Exhaust Bellow – Fits OMC & Volvo Penta 4.3L-8.2L (Replaces 3852696, 913405)

$25.69

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Upper Exhaust Bellow – Fits OMC & Volvo Penta 4.3L-8.2L (Replaces 3852696, 913405) is backordered and will ship as soon as it is back in stock.

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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

Free standard shipping on all orders under 1 KG

If you have any questions, feel free to email us at info@sierramarines.com, and we’ll get back to you within 20–36 hours.

Product Details

This Upper Exhaust Bellow is designed for OMC Cobra stern drives from 1986–1993 and Volvo Penta models including the AQ DPX, SX, and King Cobra series, accommodating engines from 4.3L to 8.2L. It serves as a crucial component in the transom assembly, ensuring a sealed exhaust path.

This part is a direct replacement for OMC part numbers 3852696 and 913405, and offers interchange with Mallory 9-72802, GLM 89224, and Sierra 18-2779.

Constructed from high-grade, durable marine rubber for longevity.
Designed for external installation on the transom assembly.
Secures with standard hose clamp attachments for a reliable seal.

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket brands.

Brand	Part Number
OMC	3852696
Volvo Penta	913405
Mallory	9-72802
GLM	89224
Sierra	18-2779

Engine & Model Compatibility

Confirm your engine model and year in the table below.

This exhaust bellow is confirmed to fit the following OMC Cobra models. Fitment for Volvo Penta models should be verified by part number (913405) as specific year ranges are not available.

Brand	Model	Rated HP	Stroke	Years	OEM Part No.	Notes
OMC	Cobra 4.3L	262 CID	4-Stroke	1986–1993	3852696	Upper exhaust bellow
OMC	Cobra 5.0L	305 CID	4-Stroke	1986–1993	3852696	Upper exhaust bellow
OMC	Cobra 5.7L	350 CID	4-Stroke	1986–1993	3852696	Upper exhaust bellow
OMC	Cobra 5.8L	351 CID	4-Stroke	1986–1993	3852696	Upper exhaust bellow
OMC	King Cobra 7.4L	454 CID	4-Stroke	1987–1993	3852696	Upper exhaust bellow
OMC	King Cobra 7.5L	460 CID	4-Stroke	1987–1993	3852696	Upper exhaust bellow
OMC	Cobra 8.1L	496 CID	4-Stroke	1986–1993	3852696	Upper exhaust bellow
OMC	Cobra 8.2L	502 CID	4-Stroke	1986–1993	3852696	Upper exhaust bellow

Technical Specs

Product Type: Upper Exhaust Bellow
Installation: External
Material: Marine-grade rubber
Color: Black
Dimensions: 3-1/2" × 3-1/2" (88.9 mm × 88.9 mm)
Connection: Hose clamp attachment
Position: Upper exhaust, transom assembly
Replaces: Original upper exhaust bellow

What’s in the Box

1 × Upper Exhaust Bellow (Replaces 3852696/913405)

Installation Notes

Ensure the engine is off and the battery is disconnected before starting work.
Gain access to the stern drive's transom assembly area where the exhaust bellow is located.
Carefully loosen and remove the hose clamps securing the old bellow at both ends.
Remove the old bellow. Clean the mounting surfaces on the transom and stern drive thoroughly.
Position the new bellow and securely tighten the hose clamps to create a watertight seal.
After installation, reconnect the battery and run the engine, checking carefully for any exhaust or water leaks around the new bellow.

Troubleshooting & FAQ

How do I know if this bellow will fit my specific engine model?

Verify your model and year against the compatibility table provided. This bellow is designed for OMC Cobra drives (1986–1993) and various Volvo Penta models. The most reliable method is to cross-reference your existing part number with the OEM numbers 3852696 or 913405.

What are the signs of a failing exhaust bellow?

Common signs of failure include visible cracks, splits, brittleness, or water leaking into the bilge from the transom area. A damaged bellow can allow exhaust fumes to enter the boat and can lead to water ingestion and catastrophic engine damage if not replaced promptly.

How often should I replace my exhaust bellow?

For preventative maintenance, it is recommended to inspect exhaust bellows annually for any signs of wear or damage. We suggest replacement every 3-5 years, depending on usage (saltwater vs. freshwater) and storage conditions.

Is a special tool required for installation?

No special proprietary tools are required. Installation can typically be completed using standard hand tools, such as a screwdriver or a socket wrench set for the hose clamps.

OEM vs. Aftermarket?

This listing is an aftermarket replacement (not OEM). It has been built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility and is batch-inspected for consistency and quality.

Shipping speed & cost

We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free for most orders; expedited options will appear at checkout if they are available for your location.

Warranty & returns

This product is covered by a 1-year warranty against manufacturing defects under normal use. If any issues arise, contact our support team with your order details. Returns are accepted within our standard window, provided the item is unused and in its original condition. Please see our policy page or reach out for instructions.

Safety & Important Info

Verify images and specifications against your original part. If anything differs—even if your model appears compatible—do not purchase.
This is an aftermarket replacement, not an OEM component. Brand names and part numbers are used for reference purposes only.
Professional installation is recommended for safety and performance. Improper installation can lead to component failure and engine damage.

About Sea Sierra

Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and rigorously tested for real-world conditions.
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 manufacturers, we provide fair pricing without compromising on materials or quality control.

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