Bellows Kit – Fits OMC Cobra & Volvo Penta SX/DP-Series (Replaces 911826, 3854127, 3841481)

$69.99

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Product Details

This U-joint Bellows Kit provides a direct replacement for OMC Cobra Sterndrive I/O models from 1986–1993 and equivalent Volvo Penta SX-series (SX-S, SX-C, SX-R, SX-M) and DP-series (DP-S, DP-S1, DP-SM) stern drives. It is designed to protect the critical U-joint connection between the transom and the drive unit from water intrusion and corrosion.

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

Engineered for direct OEM replacement to ensure a secure, leak-free fit.
Constructed from durable, marine-grade rubber to withstand harsh saltwater and freshwater environments.
Includes bellows with stainless steel clamps for a complete installation.

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket brands.

Brand	Part Number
OMC	911826
OMC	3841481
OMC	3850426
Volvo Penta	3854127
Volvo Penta	22197130

Engine & Model Compatibility

Confirm your engine model and year in the table below.

OMC Cobra: This bellows fits I/O sterndrive models manufactured between 1986 and 1993.

Volvo Penta: This bellows fits a range of SX and DP-S series drives. As year ranges vary, confirm your model and OEM part number before ordering.

Brand	Model	Rated HP	Stroke	Years	OEM Part No.
OMC	Cobra Sterndrive I/O	Various	4-Stroke	1986–1993	911826/3841481/3850426
Volvo Penta	SX-S	Various	4-Stroke		3854127/22197130
Volvo Penta	SX-C	Various	4-Stroke		3854127/22197130
Volvo Penta	SX-R	Various	4-Stroke		3854127/22197130
Volvo Penta	SX-M	Various	4-Stroke		3854127/22197130
Volvo Penta	DP-S	Various	4-Stroke		3854127/22197130
Volvo Penta	DP-S1	Various	4-Stroke		3854127/22197130
Volvo Penta	DP-SM	Various	4-Stroke		3854127/22197130

Technical Specs

Product Type: U-Joint Bellows Kit
Installation: Direct OEM replacement
Connection: Transom to drive
Housing Material: Marine-grade rubber
Housing Color: Black
Fitting Type: Bellows with stainless steel clamps
Warranty: 1 Year
Other Technical Attributes: Protects U-joint connection at transom

What’s in the Box

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

Installation Notes

Ensure the vessel is safely out of the water and the sterndrive is tilted to the full "up" or "trailer" position.
Disconnect the battery and follow all manufacturer safety precautions before starting work.
Remove the sterndrive from the transom assembly according to your service manual's instructions. This is a complex step that may require a lifting hoist.
Once the drive is removed, locate the old U-joint bellows. Loosen and remove the clamps securing it to the gimbal housing and the drive.
Remove the old bellows, being careful not to damage the sealing surfaces. Clean both mounting surfaces thoroughly.
Install the new bellows, ensuring it is properly seated and aligned.
Secure the new bellows with the provided stainless steel clamps. Tighten them to the torque specified in your service manual to create a watertight seal.
Inspect other nearby components, such as the shift cable and exhaust bellows, for wear and consider replacing them at the same time.
Reinstall the sterndrive, ensuring the U-joint shaft aligns correctly with the engine coupler.
Once fully assembled, perform a leak check by lowering the drive into the water and inspecting the bellows area before starting the engine.

Troubleshooting & FAQ

How do I know if this bellows will fit my drive?

This kit is designed for OMC Cobra drives (1986–1993) and various Volvo Penta SX and DP-S series sterndrives. The most reliable method of confirmation is to match the part numbers listed (OMC 911826, 3841481; Volvo Penta 3854127) with your existing part or service manual. Visual comparison with your old part is also recommended.

What are the signs of a failing U-joint bellows?

Common signs include visible cracks, perishing, or splits in the rubber. A more serious symptom is water inside the bellows or gear lube leaking out, which indicates a complete failure and puts your U-joints and gimbal bearing at immediate risk of catastrophic damage.

Is this kit for the U-joint, exhaust, or shift cable?

This is the U-joint bellows, which is the largest and most critical of the three. It protects the driveshaft universal joints. Exhaust and shift cable bellows are different parts and are not included.

How often should a sterndrive bellows be replaced?

Preventative replacement is recommended every 1-2 seasons for boats stored in the water and every 3-5 years for trailered boats, regardless of visible condition. The marine environment degrades rubber over time, and proactive replacement prevents major failures.

Can I replace this myself?

Replacing the U-joint bellows is an advanced task that requires removing the entire sterndrive unit from the boat. It demands specialized tools and mechanical expertise. We strongly recommend professional installation to ensure a proper seal and prevent component damage.

OEM vs. Aftermarket?

This listing is an aftermarket replacement (not OEM). It is built to OEM-level specifications with comparable materials and manufactured in an ISO 9002 facility, where it is batch-inspected for consistency.

Shipping speed & cost

We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free; expedited options appear at checkout where available.

Warranty & returns

This product is covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact our support team with your order details. Returns are accepted within our standard window for unused items in their original condition. See our policy page or reach out for instructions.

Safety & Important Info

Verify images and specifications against your original part. If anything differs—even if your model appears compatible—do not purchase.
This is an aftermarket replacement, not an OEM component. Brand names and part numbers are used for reference purposes only.
Professional installation is recommended for safety and performance. Improper installation can lead to component failure and water damage.

About Sea Sierra

Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days, getting you back on the water sooner.
Manufacturer-Direct Value — By working directly with manufacturers, we offer fair pricing without compromising on materials or quality control.

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