Transom Bellows Service Kit for OMC Cobra & Volvo Penta SX/DP Drives – Includes U-Joint, Exhaust & Shift Bellows
Transom Bellows Service Kit for OMC Cobra & Volvo Penta SX/DP Drives – Includes U-Joint, Exhaust & Shift Bellows is backordered and will ship as soon as it is back in stock.
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Transom Bellows Service Kit for OMC Cobra & Volvo Penta SX/DP D...
Transom Bellows Service Kit for OMC Cobra & Volvo Penta SX/DP Drives – Includes U-Joint, Exhaust & Shift Bellows is backordered and will ship as soon as it is back in stock.
Product Details
This complete transom bellows service kit is designed for OMC Cobra stern drives and Volvo Penta SX and DP-series drives. It replaces the major transom and sterndrive sealing components that protect the universal-joint area, exhaust passage, shift cable, gimbal bearing, and water-inlet connection from water intrusion and related damage.
The kit includes a U-joint bellows with clamp, an exhaust bellows with clamp, a shift cable bellows, a gimbal bearing, a water inlet hose, an outdrive mounting gasket kit, and hose clamps. It is an aftermarket replacement kit; verify the existing component numbers and drive configuration before ordering.
- Complete service solution for the transom bellows and related mounting components.
- Includes separate U-joint, exhaust, and shift cable bellows rather than a single bellows only.
- Includes the gimbal bearing, water inlet hose, mounting gasket kit, and hose clamps listed below.
- Designed for marine stern-drive service applications on the listed OMC Cobra and Volvo Penta drives.
Component and Part Number Matrix
Reference numbers identify the individual components included in this kit. They are not all interchangeable with one another.
| Included Component | Reference Brand | Replacement or Reference Numbers | Quantity |
|---|---|---|---|
| U-joint bellows with clamp | Volvo Penta / Sierra | 3854127, 3841481, 18-2765, 22197130 | 1 |
| Exhaust bellows with clamp | Volvo Penta / Sierra | 3850426, 0767724, 18-1074, 9-72711 | 1 |
| Shift cable bellows | OMC / Sierra | 911826, 89210, 18-2763 | 1 |
| Gimbal bearing | OMC / Sierra | 3853807, 18-2100, 9-72410, 21905, 0983937, 30-60794A4 | 1 |
| Water inlet hose | OMC | 911830, 778188 | 1 |
| Outdrive mounting gasket kit | — | Included service component | 1 kit |
| Hose clamps | — | Included service hardware | As supplied |
Drive Compatibility
Match your stern-drive model and the component numbers on your existing parts or service documentation before purchase.
| Brand | Drive Family or Model | Fitment Information | Important Note |
|---|---|---|---|
| OMC | Cobra stern drive | Fits most OMC Cobra drives from 1986 and later. | Confirm the drive configuration and component numbers. |
| Volvo Penta | SX-S | Listed Volvo Penta SX-series application. | Confirm the existing bellows and drive references. |
| Volvo Penta | SX-C | Listed Volvo Penta SX-series application. | Confirm the existing bellows and drive references. |
| Volvo Penta | SX-R | Listed Volvo Penta SX-series application. | Confirm the existing bellows and drive references. |
| Volvo Penta | SX-M | Listed Volvo Penta SX-series application. | Confirm the existing bellows and drive references. |
| Volvo Penta | DP-S | Listed Volvo Penta DP-series application. | Confirm the existing bellows and drive references. |
| Volvo Penta | DP-S1 | Listed Volvo Penta DP-series application. | Confirm the existing bellows and drive references. |
| Volvo Penta | DP-SM | Listed Volvo Penta DP-series application. | Confirm the existing bellows and drive references. |
Technical Specifications
- Product Type
- Transom bellows service kit
- Included Bellows
- U-joint bellows with clamp, exhaust bellows with clamp, and shift cable bellows
- Additional Components
- Gimbal bearing, water inlet hose, outdrive mounting gasket kit, and hose clamps
- Application
- OMC Cobra and Volvo Penta SX/DP stern drives
- Installation
- Transom-mounted sterndrive service; follow the applicable service manual
- Product Status
- Aftermarket replacement kit; not an OEM-branded assembly
What's in the Box
- 1 x U-joint bellows with clamp
- 1 x Exhaust bellows with clamp
- 1 x Shift cable bellows
- 1 x Gimbal bearing
- 1 x Water inlet hose
- 1 x Outdrive mounting gasket kit
- Hose clamps as supplied with the kit
Installation Notes
- Remove the boat from the water and secure it safely on a trailer, lift, or suitable work stand.
- Disconnect the battery and follow all applicable manufacturer safety procedures.
- Remove the sterndrive according to the service manual. This work may require a lifting hoist and specialized tools.
- Remove the existing bellows, gimbal bearing, water inlet hose, and mounting gasket components as applicable. Clean and inspect all sealing and mounting surfaces.
- Install the replacement components in the correct positions. Do not interchange the U-joint, exhaust, and shift cable bellows.
- Fit the supplied clamps and tighten all fasteners to the torque and sequence specified by the service manual.
- Inspect the shift cable, gimbal housing, engine coupler, and nearby exhaust components for wear before reassembly.
- Reinstall and align the sterndrive, then perform a thorough leak inspection before returning the boat to service.
Professional installation is recommended because bellows replacement requires sterndrive removal and correct sealing of several critical components.
Troubleshooting & FAQ
Is this a single bellows or a complete kit?
This is a complete transom bellows service kit. It includes three different bellows, a gimbal bearing, a water inlet hose, an outdrive mounting gasket kit, and hose clamps.
Does the kit include the shift cable bellows?
Yes. One shift cable bellows is included. Its listed reference numbers are 911826, 89210, and 18-2763.
Which component replaces 3854127?
The U-joint bellows included in the kit is listed as replacing 3854127, 3841481, 18-2765, and 22197130. The exhaust bellows is a separate component with separate reference numbers.
Which Volvo Penta drives are listed?
The listed applications are SX-S, SX-C, SX-R, SX-M, DP-S, DP-S1, and DP-SM. Confirm the component numbers and drive configuration before ordering.
What are common signs that bellows service is needed?
Cracks, splits, hardening, visible deterioration, water inside the bellows area, or signs of corrosion around the protected components can indicate that inspection or replacement is needed.
Can I install this kit myself?
Installation is an advanced sterndrive service procedure. It requires drive removal, careful surface preparation, correct clamp placement, and service-manual torque specifications. Professional installation is recommended.
Safety & Important Information
- Verify your drive model, configuration, existing component numbers, and mounting arrangement before ordering.
- Do not treat a component reference as proof that every drive variant fits; model and configuration must be checked together.
- This is an aftermarket replacement kit. OMC and Volvo Penta names and reference numbers are used only to identify intended applications and replacement relationships.
- Never operate the boat after bellows service until the drive has been correctly reinstalled and the area has been checked for leaks.
About Sea Sierra
- Marine-Focused Parts — We supply replacement components for common sterndrive and marine service applications.
- Clear Fitment Information — Component descriptions and reference numbers are provided to help you verify the correct application.
- Service-Ready Solutions — Our kits are organized around practical maintenance and repair needs for getting your vessel back on the water.
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