Transom Seal Service Kit – Fits Volvo Penta SX/DP & OMC Cobra (Replaces 3854127, 914036, 3850426)
Transom Seal Service Kit – Fits Volvo Penta SX/DP & OMC Cobra (Replaces 3854127, 914036, 3850426) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Transom Seal Service Kit – Fits Volvo Penta SX/DP & OMC Cobra (...
Product Details
This complete Transom Seal Service Kit provides all the necessary components to repair and reseal the transom assembly on compatible Volvo Penta and OMC stern drives. It is designed for Volvo Penta SX and DP series drives manufactured from 1986 to the present, as well as OMC Cobra stern drives produced between 1986 and 1993 (excluding cone clutch models). Proper replacement prevents seawater from entering the vessel and corroding critical drive components.
The kit serves as a direct replacement for multiple OEM and aftermarket part numbers, including Volvo Penta 3854127, 22197130, and 3850426; OMC 914036 and 911826; and Sierra 18-2772-1.
- Engineered with marine-grade neoprene rubber bellows to meet or exceed original equipment specifications.
- Features a clamp-on design for a secure, direct-fit installation on the transom housing.
- Prevents common issues like water intrusion, gimbal bearing failure, and corrosion of the U-joint assembly.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Volvo Penta | 3854127 | U-Joint Bellows |
| Volvo Penta | 22197130 | U-Joint Bellows |
| Volvo Penta | 23075752 | U-Joint Bellows |
| Volvo Penta | 3850426 | Exhaust Bellows |
| OMC | 914036 | Exhaust Bellows |
| OMC | 0914036 | Exhaust Bellows |
| OMC | 911826 | Shift Cable Bellow |
| OMC | 0911826 | Shift Cable Bellow |
| Sierra | 18-2772-1 | Full Kit Reference |
| Sierra | 18-2765 | U-joint bellows only |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Volvo Penta, this kit is compatible with SX and DP series stern drives (SX-S, SX-C, SX-R, SX-M, DP-S, DP-S1, DP-SM) from 1986 to present.
For OMC, this kit fits Cobra stern drives from 1986–1993. It is not compatible with models that use a cone clutch.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Volvo Penta | SX | Various | 4-Stroke | 1986–Present | 22197130/23075752/3841481 | |
| Volvo Penta | SX-S | Various | 4-Stroke | 1986–Present | 22197130/23075752/3841481 | |
| Volvo Penta | SX-C | Various | 4-Stroke | 1986–Present | 22197130/23075752/3841481 | |
| Volvo Penta | SX-R | Various | 4-Stroke | 1986–Present | 22197130/23075752/3841481 | |
| Volvo Penta | SX-M | Various | 4-Stroke | 1986–Present | 22197130/23075752/3841481 | |
| Volvo Penta | DP-S | Various | 4-Stroke | 1986–Present | 22197130/23075752/3841481 | |
| Volvo Penta | DP-S1 | Various | 4-Stroke | 1986–Present | 22197130/23075752/3841481 | As listed by aftermarket sources |
| Volvo Penta | DP-SM | Various | 4-Stroke | 1986–Present | 22197130/23075752/3841481 | As listed by aftermarket sources |
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| OMC | Cobra | Various | 4-Stroke | 1986–1993 | 3854127/914036 | Not compatible with cone clutch models |
Technical Specs
- Product Type
- Transom Seal Bellows Kit
- Installation
- Direct replacement with clamp-on fitting
- Connection
- Clamp-on
- Housing Material
- Marine-grade neoprene rubber
- Housing Color
- Black
- Fitting Type
- Bellows with clamps
- Warranty
- 1 Year (aftermarket)
- Other Attributes
- Manufactured to OEM specifications using same materials as originals; prevents seawater corrosion and transom damage
What’s in the Box
- 1 x U-Joint Bellow (Replaces 3854127, 3841481, 22197130)
- 1 x Exhaust Bellow (Replaces 3850426, 914036)
- 1 x Shift Cable Bellow (Replaces 911826)
- 1 x Gimbal Bearing (Replaces 3853807)
- 1 x Water Inlet Hose (Replaces 911830)
- 1 x Outdrive Mounting Gasket Kit (Replaces 508105)
- 1 x Oil Seal (Replaces 3852548, 911823)
- 4 x Clamps
- 3 x Zip Ties
Installation Notes
- Disconnect the battery and ensure the outdrive is in the fully down (trimmed in) position.
- Remove the outdrive assembly by following the procedures in your official service manual.
- Carefully cut and remove the old U-joint, exhaust, and shift cable bellows. Inspect for any signs of water intrusion or damage in the transom assembly.
- Remove the old gimbal bearing using a slide hammer with a bearing puller attachment.
- Thoroughly clean all mating surfaces on the bell housing and transom assembly, removing any old sealant or debris.
- Install the new gimbal bearing using a dedicated bearing installation tool to prevent damage. Ensure it is seated correctly.
- Fit the new shift cable bellow, water inlet hose, and oil seal according to your manual's instructions.
- Apply a suitable marine bellows adhesive (e.g., Permatex Bellows Adhesive) to the mounting grooves.
- Install the new exhaust and U-joint bellows, ensuring they are properly seated and oriented. Secure them firmly with the new clamps.
- Reinstall the outdrive, carefully aligning the driveshaft splines and shift mechanism.
- Torque all fasteners to the manufacturer’s specified values and check for leaks in a controlled environment before open water use.
Troubleshooting & FAQ
How do I know if this kit fits my specific boat?
This kit's compatibility is based on the stern drive unit, not the boat hull. Verify that you have a Volvo Penta SX/DP series drive (1986–Present) or an OMC Cobra drive without a cone clutch (1986–1993). If you are unsure, cross-reference the part numbers on your existing bellows with those listed in our Part Number Matrix.
What are the signs of a failing transom seal or bellows?
The most common sign is water inside the boat at the transom area. You may also find water inside the U-joint bellows upon inspection, hear a grinding or roaring noise from a failed gimbal bearing, or find water mixed in with your drive lubricant.
How often should I replace my transom bellows?
For preventative maintenance, it is recommended to replace all transom bellows every 3-5 years, especially for boats stored in the water. They should be inspected for cracks, brittleness, or tears at least once per season.
Are special tools required for this installation?
Yes. A gimbal bearing puller (slide hammer type) and a bearing installation tool are essential for replacing the gimbal bearing correctly. A bellows expander tool can also make fitting the U-joint bellow much easier. We highly recommend professional installation if you do not have these tools.
Do I need to apply sealant to the bellows?
Yes, it is best practice to apply a marine-grade bellows adhesive to the channels on the transom and bell housing where the bellows seat. This ensures a watertight seal and helps hold the bellows in place.
What happens if a bellows fails?
A failed U-joint or shift cable bellow will allow water to enter the drive, quickly destroying the gimbal bearing, U-joints, and potentially causing catastrophic damage to the outdrive and transom. A failed exhaust bellow can allow water to enter the engine. Immediate replacement is critical.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). It is built to OEM-level specifications with comparable materials. Our parts are manufactured in an ISO 9002 certified facility and are batch-inspected for quality and consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free for most orders, and expedited options are available at checkout where applicable.
Warranty & returns
This product is covered by a 1-year warranty against manufacturing defects under normal use. If any issues arise, please contact our support team with your order details. Returns are accepted within our standard return 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 before ordering. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement part, not an original equipment manufacturer (OEM) component.
- Professional installation is highly recommended for safety, performance, and to prevent premature failure.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and rigorously tested for real-world reliability.
- Fast Global Fulfillment — With free standard delivery to most regions, you can expect your parts to arrive in 5–15 days.
- Manufacturer-Direct Value — By working directly with manufacturers, we offer fair pricing without compromising on materials or quality control.
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