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Description
Bellows Transom Repair Kit for Volvo Penta SX-C SX-M & OMC Cobra 1986–1998 (Replaces 3854127, 3852352, 3850426)Professional Marine Bellows Replacement Kit This is a complete transom seal bellows replacement kit designed for Volvo Penta SX series sterndrives (1994 1998) and OMC Cobra models (1986 1993). It provides all necessary components to restore the integrity of the transom seal, preventing water from entering the vessel and protecting critical driveline components. The bellows are constructed from a EPDM Neoprene rubber compound for durability against UV,
Professional Marine Bellows Replacement Kit
This is a complete transom seal bellows replacement kit designed for Volvo Penta SX series sterndrives (1994-1998) and OMC Cobra models (1986-1993). It provides all necessary components to restore the integrity of the transom seal, preventing water from entering the vessel and protecting critical driveline components. The bellows are constructed from a EPDM/Neoprene rubber compound for durability against UV, ozone, and saltwater exposure.
This kit serves as a direct replacement for multiple OEM andpart numbers, ensuring a precise fit for the specified engine models. It is engineered to meet or exceed original equipment specifications for sealing and performance.
- Complete Kit: Includes U-Joint bellows, exhaust bellows, water inlet hose, and a full sealing kit.
- Durable Construction: Made from high-grade EPDM/Neoprene rubber with stainless steel clamping hardware.
- Wide Compatibility: Fits a broad range of Volvo Penta SX, DP-S, DP-SM, and OMC Cobra/King Cobra sterndrives.
Part Number Cross-Reference
Use this table to confirm equivalent part numbers across OEM andbrands.
| Brand | Part Number |
|---|---|
| OMC | 3854127 / 983973 / 987467 |
| OMC | 3852352 / 911830 |
| OMC | 3850426 / 914036 / 767724 |
| Sierra | 18-2765 / 18-1074 |
| Volvo Penta | 22197130 / 23075752 / 3841481 |
| GLM | 89200 / 89190 |
Compatible Engine Models
Confirm your engine model/year in the table below.
OMC Cobra Series (1986–1993)
| Brand | Model | Rated HP | Configuration | Years | OEM Part Numbers | Application Notes |
|---|---|---|---|---|---|---|
| OMC | Cobra 3.0L | 140 | 4-Stroke Inline-4 | 1986–1993 | 3854127, 3852352, 3850426 | All clutch dog models |
| OMC | Cobra 4.3L V6 | 175-205 | 4-Stroke V6 | 1986–1993 | 3854127, 3852352, 3850426 | Standard and High Output |
| OMC | Cobra 5.0L V8 | 230-260 | 4-Stroke V8 | 1986–1993 | 3854127, 3852352, 3850426 | Ford and GM engine blocks |
| OMC | Cobra 5.7L V8 | 260-300 | 4-Stroke V8 | 1986–1993 | 3854127, 3852352, 3850426 | Standard and High Output |
| OMC | Cobra 5.8L V8 | 280-320 | 4-Stroke V8 | 1986–1993 | 3854127, 3852352, 3850426 | Ford 351W based engine |
| OMC | King Cobra 7.4L V8 | 330-370 | 4-Stroke Big Block V8 | 1987–1993 | 3854127, 3850426 | Verify water hose compatibility |
Volvo Penta SX Series (1994-1998)
| Brand | Model | Rated HP | Configuration | Years | OEM Part Numbers | Application Notes |
|---|---|---|---|---|---|---|
| Volvo Penta | SX-C 3.0L | 135 | 4-Stroke Inline-4 | 1994–1998 | 3854127, 3852352, 3850426 | Single propeller drive |
| Volvo Penta | SX-C 4.3L | 190 | 4-Stroke V6 | 1994–1998 | 3854127, 3852352, 3850426 | V6 configuration |
| Volvo Penta | SX-M 5.0L | 220 | 4-Stroke V8 | 1994–1998 | 3854127, 3852352, 3850426 | V8 standard output |
| Volvo Penta | SX-R 5.7L | 250 | 4-Stroke V8 | 1994–1998 | 3854127, 3852352, 3850426 | High performance V8 |
| Volvo Penta | SX-S 5.8L | 275 | 4-Stroke V8 | 1994–1998 | 3854127, 3852352, 3850426 | Ford-based V8 engine |
| Volvo Penta | DP-S 7.4L | 310 | 4-Stroke Big Block V8 | 1997–1998 | 3854127, 3850426 | Large displacement V8 |
| Volvo Penta | DP-SM 8.2L | 350 | 4-Stroke Big Block V8 | 1997–1998 | 3854127, 3850426 | Marine-specific big block |
Technical Specifications
| Specification | Value |
|---|---|
| Product Type | Marine Transom Bellows Repair Kit |
| Application | Complete transom seal replacement |
| Installation Type | Clamp-on with stainless steel hardware |
| Fuel Compatibility | All marine fuel types |
| Connection Method | Heavy-duty stainless steel clamps |
| Housing Material | EPDM/Neoprene rubber compound |
| Housing Color | Marine-grade black |
| Kit Dimensions | U-Joint: 5.5" x 5.13" x 5.5", Exhaust: 7" L x 3" large end x 2.5" small end |
| Complete Kit Weight | Approximately 3.8 lbs (1000g) |
| Fitting Configuration | Flexible rubber bellows with clamp connections |
| Working Pressure | Up to 57 PSI (component dependent) |
| Burst Pressure Rating | 3x working pressure minimum |
| Operating Temperature | -65°F to +350°F (-54°C to +177°C) |
| Warranty Coverage | 12 months manufacturer warranty |
| Marine Certifications | UV resistant, ozone resistant, saltwater compatible |
Package Contents
This professional transom bellows repair kit is sold as a combination of one of each main component, and includes:
- ✅ 1x U-Joint Bellows Assembly (Replaces 3854127)
- EPDM construction and stainless steel clamps included to protect the universal joint from water intrusion.
- ✅ 1x Water Inlet Hose (Replaces 3852352)
- 1-inch diameter flexible hose made from high-temperature rated rubber with stainless steel clamps included.
- ✅ 1x Exhaust Bellows Assembly (Replaces 3850426)
- Heavy-duty exhaust-rated material, 7-inch length with tapered ends, and corrosion-resistant clamp hardware.
- ✅ 1x Complete Sealing Kit
- Includes marine-grade gaskets, O-rings, installation hardware, and bellows adhesive/sealant.
- ✅ 1x Installation Hardware Set
- Includes all necessary stainless steel clamps (various sizes) and mounting hardware.
Installation Guide
Professional installation is highly recommended for safety and to ensure a proper seal. These are general steps and may vary based on your specific engine model.
- Safety First: Disconnect the battery and ensure the sterndrive unit is securely supported before beginning work.
- Remove Sterndrive: Detach the sterndrive unit from the transom assembly to gain access to the bellows.
- Remove Old Bellows: Carefully cut and remove the old U-joint bellows, exhaust bellows, and water inlet hose. Note the orientation of each component.
- Clean Surfaces: Thoroughly clean the mounting surfaces on both the transom and the sterndrive. Remove all old sealant, rubber, and corrosion.
- Apply Adhesive: Apply a thin, even layer of bellows adhesive to the cleaned mounting surfaces where the new bellows will be seated.
- Install New Bellows: Install the new bellows and hoses in the reverse order of removal. Ensure they are correctly seated and not twisted.
- Secure Clamps: Position the stainless steel clamps correctly and tighten them securely to the manufacturer's torque specifications. This step is critical for a watertight seal.
- Reinstall Sterndrive: Reattach the sterndrive, ensuring all connections are correct and secure. Install the new gaskets from the sealing kit as required.
- Leak Check: Once assembled, lower the drive into the water and check carefully for any signs of leaks before starting the engine.
Troubleshooting & FAQ
Q: How can I confirm this kit will fit my specific engine?
A: The surest method is to match your existing part numbers to those listed in our cross-reference table. You can also use the "Compatible Engine Models" table to find your model and year. For final verification, contact us with your engine serial number.
Q: What are the signs that my bellows need to be replaced?
A: Common signs of failure include visible cracks or splits in the rubber, water in your bilge area, or a stiff or grinding noise when turning the sterndrive, which could indicate water has damaged the gimbal bearing or U-joints.
Q: How often should transom bellows be replaced?
A: Bellows are a routine maintenance item. The replacement interval can vary based on usage and water conditions (saltwater vs. freshwater), but a general recommendation is to inspect them annually and replace them every 3-5 years or at the first sign of wear.
Q: What is the difference between the U-joint bellows and the exhaust bellows?
A: The U-joint (or universal joint) bellows is the most critical, as it keeps water out of the gimbal housing and protects the U-joints and gimbal bearing. The exhaust bellows simply funnels engine exhaust through the sterndrive and into the water.
Q: OEM vs. Aftermarket?
A: This listing is anreplacement 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 anreplacement 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:
- 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
4.4 ★★★★★
Based on 17 reviews
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Product Reviews
★★★★★ 1
Dont wait! Assemble right away! Just in case you need to return it.
Color: Black, Size: 22" - 4 Panel
Ok, I like the idea of this but the assembly is frustrating. One side lined up perfectly with the holes however, the small bars that connect the screen to base is not lining up. I think it's do the fabric the screen or divider is made of. It's not stretchy. I brought this months ago and just opened it today. I'm upset and don't even think returning it is possible. If the material was a bit longer or stretchy to give a little room to work with this divider would be great. However, I'm not sure what I can use it for since I'm unable to attach it to the bottom. Beware! Don't wait like me. Tip for the manufacturer. Next time invest in Velcro dividers so the fabric can be adjusted with ease. Literally if I take the screen off the frame aligns perfectly. However, it defeats its purpose of privacy. I might buy some material myself and create a more flexible divider. Or I'll buy Velcro myself and attach to the bottom. I don't know yet.
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Reviewed in the United States on December 15, 2025
★★★★★ 5
Versatile Room Divider With Easy Assembly and Strong Coverage
Size: 3 Panel 12FT W
I picked up this Siebwin 3-panel folding room divider mainly for privacy and room separation, and overall it works very well.
Assembly is very straightforward, and the divider can be set up, taken apart, and stored without much effort. The fabric quality feels good, and the frame construction is stronger and more stable than expected. The support tubes especially feel well built and help keep the divider standing securely.
One feature I really liked is the flexibility of the design. The panels can be used together as a complete divider or separated depending on the setup and available space. That makes it much more versatile for different room layouts or temporary privacy needs.
The coverage is also very good, and the size matches the manufacturer’s description accurately. The fabric blocks light and background visibility well enough to provide solid privacy without feeling overly heavy. The wider feet also help improve stability compared to thinner folding dividers.
Another positive detail is that everything arrived complete with no missing parts or damaged pieces, which made assembly much easier and faster.
Compared to cheaper privacy screens, this one feels more durable and easier to customize depending on the situation. In terms of value for the money, it feels like a very practical and worthwhile purchase considering the size, flexibility, and build quality.
Overall, a versatile and well-built room divider with easy assembly, strong privacy coverage, stable construction, complete included parts, flexible panel configuration, and excellent everyday functionality.
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Reviewed in the United States on May 27, 2026
★★★★★ 5
Stable, flexible in deployment configuration, creates true privacy and looks great.
Size: 3 Panel 12FT W
This is the second room divider panel I have installed, and there are several features about this one that I like much better than my older one.
The fact that there are no gaps and that the material is thicker means you get more privacy or more hiding power, if you wish. My older divider has vertical spaces between each of the panels and the panels are half as wide as the Siebwin panels, so there are many vertical spaces. The Siebwin divider really creates privacy.
Another feature that I really appreciate is that the legs are wider and stand off from the floor. On my older one the legs are flat and they're rather awkward to adjust because they create more drag on the floor. The feet on the older one also loosen if you turn them counter clockwise, so adjustments of configuration that require the feet to be moved are more complex.
The older divider also must be deployed in a zig-zag fashion because he feet are not as wide, but this new one can be deployed and stable in a straight, an "N" shape or an arc. They are both the same length, but because the older one must be use in a zig-zag deployment it doesn't reach to the length of the new one.
The Siebwin divider definitely costs more at $103.48, but it sports several features and advantages over the other brand, so it does a better job and is worth the extra cost.
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Reviewed in the United States on May 25, 2026
★★★★★ 4
Easy to assemble, does the job, material is shiny nylon and shows creases, minor defects, sloppy
Size: 3 Panel 12FT W, Size: 3 Panel 12FT W
The Siebwin room divider is a good idea, and for the price, it mostly delivers on the intended functionality. I ordered the 12 foot, 3-panel version mainly to hide an unfinished basement storage area that had become an eyesore. It works well for that purpose and gives the space a cleaner appearance without spending the kind of money that more decorative dividers or custom partitions cost. If you need something temporary, portable, or mainly functional, this is a viable option.
There are a few limitations that became obvious during setup and use. The first thing I noticed was that the weld quality on some of the metal poles is fairly sloppy. Once the cover is installed, you do not really see it, but up close, it does not look especially refined or professional. The blackout material also is not a matte canvas style fabric as I expected. It has more of a shiny nylon appearance, and the creases are fairly visible. Being that it’s more of a nylon, I’d be hesitant to try steaming it to remove the creases. However, the creases do not matter if you are using it in a basement, dorm, or shared room, but for photography, video work, or a professional office setting, the appearance could be disappointing. The fabric is thick enough, though. It blocks visibility well enough, but strong light behind it still shows through to some extent, nothing deal-breaking. Also, my fabric appeared to be slightly defective. The hook and loop strip on one of the bottom sections was off-center and couldn't be totally attached because it was lined up with one of the legs. I originally hoped to use this as a video backdrop, but I will probably end up replacing the fabric with a proper green screen or canvas material while continuing to use the frame itself. For now, it does a good job of covering my basement junk.
Assembly was actually easier than I expected and took roughly 15 to 20 minutes. The longer vertical poles are tethered together similarly to tent poles, which made setup straightforward and fairly intuitive. The shorter horizontal pieces slide and snap together to the top and bottom of the vertical assembly. After each section is assembled, the divider panels connect together with metal plates and two knurled screws (at the top and bottom), so no tools are really required. A few screws were difficult to start because paint had gotten into the threads, but once they caught, they tightened down normally. The feet install with similar knurled fasteners and help keep the divider reasonably stable. One thing to watch for during setup is the fabric orientation. There is one arrow indicator in the middle of the fabric to indicate up. However, if you need another indicator, the smaller hook and loop strip goes on the bottom while the longer strip goes on top. I realized mine was upside down right before finishing and had to redo it. I wasn't difficult to redo, despite the defect in mine.
The overall design is practical and easy to move around. I do like that the panels can fold and bend into different shapes depending on the space. The widened feet help stability, although when trying to stretch the fabric tight, I noticed the poles sometimes wanted to overlap slightly at the joints. Tightening everything helped somewhat, but it still happened occasionally. The divider feels adequate for normal indoor use, though I would not expect premium durability or luxury-level fit and finish at this price point. The entire device can also be easily disabled and stored in a tote if you need it completely out of the way. It comes with assembly instructions, but even if you didn’t have them, it’s easy to build without them (save a mistake or two).
In terms of value, I think the Siebwin divider mostly matches its price. Around $100 gets you a large freestanding partition with decent usability and easy assembly, but there are compromises in materials, appearance, and refinement. The defects are also off-putting, but hopefully you won't have them. Higher-end room dividers can easily cost two or three times more, so some of the tradeoffs are expected. I also noticed cheaper alternatives online, but based on the quality here, I suspect those would probably have even more issues. For practical home use, temporary privacy, hiding storage areas, or separating shared spaces, this is a good option as long as expectations stay realistic.
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Reviewed in the United States on May 18, 2026
★★★★★ 3
Works well but takes up more space than expected
Size: 2 Panel 8FT W, Size: 2 Panel 8FT W
This room divider does the job for creating a little extra privacy and was easy enough to set up. The panels feel decent quality and the wider feet help keep it more stable than some cheaper screens I’ve tried. My only issue is that it takes up a bit more room than I expected, especially with the feet sticking out. It’s still portable and folds away nicely, but definitely measure your space first. Overall it works well for separating a room or blocking off an area temporarily. i wish it came in other colors
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Reviewed in the United States on May 26, 2026
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