Bellows Kit – Fits OMC Cobra Sterndrive & Volvo Penta SX (Replaces 911826, 3854127, 3841481, 3850426)

Bellows Kit – Fits OMC Cobra Sterndrive & Volvo Penta SX

This U-joint bellows kit is designed for OMC Cobra Sterndrive I/O models from 1986-1993. It is also a direct fit for equivalent Volvo Penta stern drives, including the SX-S, SX-C, SX-R, SX-M, and DP-S, DP-S1, DP-SM series.

This kit directly replaces OMC part numbers 911826, 3841481, and 3850426, as well as Volvo Penta part numbers 3854127 and 22197130.

• Installation Type: Direct OEM replacement that connects the transom to the drive.
• Function: Protects the U-joint assembly from water intrusion and corrosion.
• Kit Includes: Marine-grade rubber bellows with stainless steel clamps.

Part Number Cross-Reference

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

Compatible Engine Models

Confirm your engine model/year in the table below.

OMC Cobra Sterndrive

Volvo Penta

Technical Specifications

Package Contents

• 1 x Bellows Kit (Replaces 911826, 3854127, 3841481, 3850426)

Installation Guide

1. Safety First: Before starting, disconnect the battery and ensure the sterndrive is trimmed up for access.
2. Remove the Drive: Unbolt and carefully detach the sterndrive from the transom assembly.
3. Access the Bellows: Locate the old U-joint bellows connected between the bell housing and the transom plate.
4. Remove Old Bellows: Loosen and remove the stainless-steel clamps securing the old bellows at both ends.
5. Clean Surfaces: Thoroughly clean the mounting surfaces on the bell housing and transom to ensure a proper seal.
6. Install New Bellows: Position the new bellows, ensuring it is correctly oriented and seated.
7. Secure Clamps: Install and tighten the new stainless-steel clamps to create a watertight seal. Do not overtighten.
8. Reinstall Drive: Carefully reinstall the sterndrive, ensuring all connections are properly aligned and torqued to manufacturer specifications.
9. Final Check: Lower the drive and check for leaks or binding before reconnecting the battery.

Troubleshooting & FAQ

How do I know if this bellows kit will fit my sterndrive?
This kit fits OMC Cobra Sterndrive models from 1986-1993 and a range of Volvo Penta SX and DP series drives. The best way to confirm fitment is to match your existing part number to one of the OEM cross-references listed: OMC (911826, 3841481, 3850426) or Volvo Penta (3854127, 22197130).

What are the signs that my U-joint bellows needs to be replaced?
Common signs of failure include visible cracks, tears, or perishing of the rubber. The most critical symptom is water entering the bellows, which can lead to catastrophic U-joint and gimbal bearing failure. Regular inspection during maintenance is crucial.

How often should a sterndrive bellows be replaced?
As a preventative maintenance item, U-joint bellows are typically replaced every 1-2 seasons, especially for boats used in saltwater. Always replace them if you notice any signs of wear, damage, or water intrusion, regardless of age.

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.