SKU: 35780372011

Exhaust Bellow – Fits Volvo Penta & OMC Cobra 2.3L-8.1L V4/V6/V8 Engines (Replaces 3863450, 3852741)

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Description

Exhaust Bellow – Fits Volvo Penta & OMC Cobra 2.3L-8.1L V4/V6/V8 Engines (Replaces 3863450, 3852741)Exhaust Bellow Fits Volvo Penta & OMC Cobra 2. 3L 8. 1L V4 V6 V8 Engines This OEM quality exhaust bellow is designed for direct replacement on Volvo Penta and OMC Cobra sterndrive units. It is manufactured from durable, marine grade rubber to ensure a reliable, leak free seal and long service life in harsh marine environments. This component is compatible with a wide range of Volvo Penta 2. 3L8. 1L engines (19861991) and OMC Cobra 2. 3L5. 8L engines

Exhaust Bellow – Fits Volvo Penta & OMC Cobra 2.3L-8.1L V4/V6/V8 Engines

This OEM-quality exhaust bellow is designed for direct replacement on Volvo Penta and OMC Cobra sterndrive units. It is manufactured from durable, marine-grade rubber to ensure a reliable, leak-free seal and long service life in harsh marine environments.

This component is compatible with a wide range of Volvo Penta 2.3L–8.1L engines (1986–1991) and OMC Cobra 2.3L–5.8L engines (1987–1991), serving as a direct replacement for multiple original part numbers.

  • Installation Type: Direct OEM-Style Replacement
  • Material: High-Grade Marine Rubber
  • Manufacturing Standard: Produced in an ISO9002 certified facility

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Brand Part Number
Volvo Penta 3863450
Volvo Penta 3852742
OMC 3852741
OMC 3852742
OMC 0778066
OMC 0912376
OMC 0913592
Sierra 18-2780-1
GLM 89222
Mallory 9-72800

Compatible Engine Models

Confirm your engine model/year in the table below.

Volvo Penta

Brand Model Years OEM Part No.
Volvo Penta 2.3L 1987-1988 3863450
Volvo Penta 4.3L 1987-1989 3863450
Volvo Penta 5.7L 1986, 1987-1991 3863450

OMC Cobra

Brand Model Years OEM Part No.
OMC Cobra 2.3L 1989-1991 3852741
OMC Cobra 4.3L 1987-1989 3852741
OMC Cobra 5.7L 1989-1991 3852741

Technical Specifications

Specification Value
Product Type Exhaust Bellow/Hose
Installation Direct OEM Replacement
Connection Hose Coupler/Bellow
Housing Material Marine-Grade Rubber
Housing Color Black
Fitting Type Exhaust Coupler
Other Technical Attributes ISO9002 Certified Manufacturing

Package Contents

  • 1 x Exhaust Bellow (Replaces 3863450/3852741)

Installation Guide

  1. Safety First: Disconnect the boat's battery before beginning work.
  2. Access the Drive Unit: Trim the sterndrive to the full "up" or "trailer" position for better access.
  3. Remove Old Clamps: Locate the old exhaust bellow and loosen or cut the hose clamps at both ends.
  4. Remove Old Bellow: Carefully pry the old bellow off the transom and the drive unit. This may require some force if it has aged and hardened.
  5. Clean Mating Surfaces: Thoroughly clean the mounting surfaces on both the transom and drive unit. Remove all old adhesive, rubber residue, and corrosion.
  6. Position New Bellow: Apply a suitable marine-grade adhesive to the mounting surfaces if recommended for your model.
  7. Install and Secure: Slide the new bellow into place and secure it with new, high-quality stainless steel hose clamps.
  8. Check Alignment: Ensure the bellow is not twisted or kinked.
  9. Tighten Clamps: Tighten the clamps securely to create a watertight seal. Do not overtighten, which could damage the bellow.
  10. Final Check: Lower the drive unit, reconnect the battery, and start the engine. Check carefully for any signs of exhaust or water leaks around the new bellow.

Troubleshooting & FAQ

How do I confirm this bellow fits my specific engine?
Verify your engine brand, model, and year against the compatibility tables above. It is also critical to cross-reference the OEM part number (e.g., 3863450 for Volvo Penta, 3852741 for OMC) listed for your engine to ensure a correct match.

What are the signs that my exhaust bellow needs replacing?
Common signs of a failing exhaust bellow include visible cracks, splits, or perishing of the rubber, water leaking into the bilge area from the transom assembly, or an unusually loud or different-sounding exhaust noise.

How often should I replace the exhaust bellow?
Exhaust bellows should be inspected annually as part of regular sterndrive maintenance. We recommend replacement every 3-5 years, or immediately if any signs of wear or damage are found. Usage in saltwater environments may require more frequent replacement.

OEM vs. Aftermarket?
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.

How fast do you ship and how much does it cost?
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.

What is your warranty and return policy?
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.
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 35780372011

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Clara
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★★★★★ 3
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Color: White, Number Of Shelves: 2, Size: 15.7in, Color: White, Number Of Shelves: 2, Size: 15.7in
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Reviewed in the United States on May 27, 2026
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Mo
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★★★★★ 5
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Love these shelves so easy to put up so beautifully made and really enjoy the way they set on my wall very sturdy also!
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Reviewed in the United States on May 21, 2026
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Jason
Boise, US
★★★★★ 5
Looks nice, easy to install
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This shelf is lightweight, looks nice, and was easy to install. It comes with a little level to help you install it properly. There are plenty of mounting holes to choose from, so it is easy to screw it directly into a stud, or to just use holes that are convenient for you. It comes with a plethora of mounting hardware. I mounted mine a bit high up and chose to mount it upside down so that I wouldn't see the three screws that hold the shelf to the mounting bracket.
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Reviewed in the United States on April 8, 2026
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Miah
Phoenix, US
★★★★★ 5
Solid Floating Shelves 🛠️🏠
Color: Black, Number Of Shelves: 4, Size: 15.7in
I have installed four sets of the black floating shelves in my office. They are made of high quality materials, featuring a sophisticated black woodgrain finish with a natural texture. Supposedly, each unit can handle up to 22 pounds, though I would not recommend testing that limit with your vintage bowling ball collection if you value your flooring. They are awesome. The value is good for a set of two. Each shelf measures 22x7x1 (56x17x3 cm) inches, providing a decent amount of storage for books or decor. The installation was straightforward since the hardware for multiple wall types was included. They work well in the kitchen for spices or in the bedroom for personal belongings. One tip for a secure fit: use a level during installation and make sure the bracket is flush against the wall before sliding the shelf on, or your photos might look like they are sliding off a mountain 📐 These shelves offer a clean, modern look and stay stable once mounted correctly. They are a practical choice for adding functional display space to any room 🖼️
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Reviewed in the United States on May 4, 2026
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Tyler Kline
Chelsea, US
★★★★★ 5
Good looking shelves and easy install - skip the included drywall anchors
Color: Black, Number Of Shelves: 2, Size: 22in
I installed these shelves in a bedroom to get things off my dresser and some decor. Once mounted they look really nice. The black finish looks clean and modern and they blend in well with the room. Installation was pretty straightforward. The metal bracket mounts to the wall first and then the shelf slides over the bracket. As long as you take your time lining things up it’s a simple project. One thing I strongly recommend is not using the white plastic self-drilling drywall anchors that come with the kit. I’ve used that style before on other projects and they tend to strip out easily and leave larger holes in drywall. I used better anchors instead and the shelves mounted much more securely. The rest of the hardware worked fine and once installed the shelves feel solid and hold items well. Pros - Clean modern look - Easy installation - Feels solid once mounted - Good size for books or decor Cons - The small level included isn’t very accurate — use your own level - One of the metal brackets was slightly bent out of the box but straightened out easily Helpful tip: Use your own level and better drywall anchors if you have them. It makes installation easier and the shelves will mount much more securely. Final thoughts: For the price these are nice looking floating shelves that install easily and work well for light storage and decor.
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