Transom Bellows Seal Kit for OMC Cobra 1986 & Later and Volvo Penta SX/DP Stern Drives
Transom Bellows Seal Kit for OMC Cobra 1986 & Later and Volvo Penta SX/DP Stern Drives is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
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Transom Bellows Seal Kit for OMC Cobra 1986 & Later and Volvo P...
Transom Bellows Seal Kit for OMC Cobra 1986 & Later and Volvo Penta SX/DP Stern Drives is backordered and will ship as soon as it is back in stock.
Product Details
This Transom Bellows Seal Kit is listed for most OMC Cobra sterndrives from 1986 and later, as well as Volvo Penta SX and DP models. The kit is intended for transom and sterndrive bellows service, helping seal the drive assembly and protect connected components from water intrusion.
This listing identifies the kit with several component and cross-reference numbers. These references cover the u-joint bellows, shaved exhaust bellows, shift cable bellows, gimbal bearing, and outdrive mounting gasket kit listed below. Always compare the original part and sterndrive configuration before ordering.
- Transom bellows service kit for selected OMC Cobra and Volvo Penta sterndrives.
- Includes bellows-service components identified.
- Includes a u-joint bellows with clamp as part of the listed service components.
- Aftermarket replacement; not manufactured by OMC or Volvo Penta.
Component and Reference Matrix
The following numbers are manufacturer or aftermarket references associated with the components listed for this kit. They are not all interchangeable with one another.
| Component | Reference Numbers |
|---|---|
| U-joint bellows with clamp | 3854127, 3841481, 18-2765, 22197130 |
| Shaved exhaust bellows with clamp | 914036, 3850426, 0767724, 18-1074, 9-72711 |
| Shift cable bellows | 911826, 89210, 18-2763 |
| Gimbal bearing | 3853807, 18-2100, 9-72410, 21905, 0983937, 30-60794A4 |
| Outdrive mounting gasket kit | 508105 |
Engine & Model Compatibility
Confirm the exact sterndrive model and existing component numbers before installation. This listing covers the following applications:
| Brand | Model or Series | Year or Condition | Application Notes |
|---|---|---|---|
| OMC | Cobra | Most models, 1986 and later | Verify the specific Cobra sterndrive configuration and existing bellows references. |
| Volvo Penta | SX-S | Verify for your engine | Transom bellows application listed. |
| Volvo Penta | SX-C | Verify for your engine | Transom bellows application listed. |
| Volvo Penta | SX-R | Verify for your engine | Transom bellows application listed. |
| Volvo Penta | SX-M | Verify for your engine | Transom bellows application listed. |
| Volvo Penta | DP-S | Verify for your engine | Transom bellows application listed. |
| Volvo Penta | DP-S1 | Verify for your engine | Transom bellows application listed. |
| Volvo Penta | DP-SM | Verify for your engine | Transom bellows application listed. |
Technical Specifications
- Product Type
- Transom bellows seal kit
- Application
- Selected OMC Cobra and Volvo Penta SX/DP stern drives
- Primary Service
- Transom bellows and related sterndrive service
- U-Joint Bellows Reference
- 3854127, 3841481, 18-2765, 22197130
- Installation
- Replacement installation; follow the sterndrive manufacturer’s service procedure
What’s in the Box
- Transom bellows seal kit
- U-joint bellows with clamp
- Shaved exhaust bellows with clamp
- Shift cable bellows
- Gimbal bearing
- Outdrive mounting gasket kit
Individual quantities and the exact contents supplied with the current package are not specified. Confirm the package contents shown for your order before installation.
Installation Notes
- Disconnect the boat battery and observe all applicable marine-service safety procedures.
- Place the sterndrive in the appropriate raised or service position and support it safely.
- Remove the old bellows, clamps, and related service components as required by the sterndrive manufacturer’s procedure.
- Inspect the transom assembly, sterndrive, gimbal area, shift cable, and mating surfaces for corrosion, damage, or water intrusion.
- Clean the mounting surfaces and compare each replacement component with the part being removed.
- Install each bellows and seal in the correct location, ensuring that it is fully seated and not twisted or pinched.
- Install and tighten clamps according to the applicable service-manual specifications. Do not overtighten.
- Before launching, operate the sterndrive through its normal range of movement and check that the bellows flex correctly.
- After launching, inspect the installation for leaks before operating the boat at speed.
Troubleshooting & FAQ
How do I confirm this kit fits my sterndrive?
Match your sterndrive brand, model, year or configuration, and existing component numbers with the compatibility information and reference matrix above. OMC Cobra applications are listed as most 1986-and-later models, while Volvo Penta applications are listed for SX-S, SX-C, SX-R, SX-M, DP-S, DP-S1, and DP-SM. If the configuration is uncertain, consult a qualified marine technician.
Is this an exhaust bellows or a u-joint bellows?
This listing is a transom bellows seal kit with multiple service components identified. The u-joint bellows and the shaved exhaust bellows are separate components with different functions and reference numbers.
What does the u-joint bellows do?
The u-joint bellows seals the driveshaft area between the transom assembly and sterndrive, helping keep water away from the u-joints and related drive components.
Can I reuse the old clamps?
Reuse is not recommended unless the applicable service procedure specifically permits it and the clamps are undamaged. Use the supplied replacement clamps where provided, and tighten them to the correct service specification.
How often should bellows be inspected?
Inspect bellows during regular annual maintenance and whenever the sterndrive is serviced. Replace any bellows showing cracks, splitting, hardening, distortion, or other deterioration.
Is this an OEM component?
No. This is an aftermarket replacement kit. The reference numbers are provided for identification and compatibility checking only.
Are all reference numbers interchangeable?
No. The reference numbers correspond to different components and applications within the service kit. Match the specific component and sterndrive configuration before ordering or installing.
Safety & Important Information
- Verify the sterndrive model, configuration, and component references before purchase.
- Do not rely on a model name alone when different bellows or clutch configurations may be used.
- Inspect for corrosion, water intrusion, or damaged mating surfaces before installing replacement components.
- Professional installation is recommended because incorrect bellows installation can cause water intrusion and drive damage.
- This is an aftermarket replacement product and is not an OEM component.
About Sea Sierra
- Marine Replacement Parts — Parts selected for common service and repair applications.
- Fitment-Focused Information — Product references and model coverage are provided to support accurate part matching.
- Service Support — Compare your original component and consult a marine professional when configuration details are uncertain.
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