Transom Seal Rebuild Kit – Fits Volvo Penta SX Stern Drives
Transom Seal Rebuild Kit – Fits Volvo Penta SX Stern Drives is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Transom Seal Rebuild Kit – Fits Volvo Penta SX Stern Drives
Product Details
This Transom Seal Rebuild Kit – Fits Volvo Penta SX Stern Drives provides the essential components for servicing Volvo Penta SX series stern drives, including SX, SX-C, SX-M, and SX-R models. It is specifically not compatible with SX-A drives.
It serves as a direct interchange for Sierra 18-2772-1, Mallory 9-72931, and JLM Marine 17400-87L00.
- Direct replacement installation simplifies maintenance.
- Bellows are constructed from durable, marine-grade rubber/neoprene.
- Engineered to meet or exceed original equipment manufacturer (OEM) specifications.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket suppliers.
| Brand | Part Number | Notes |
|---|---|---|
| Volvo Penta | 3853807 / 3841481 / 3850426 / 3852560 | OEM part numbers for individual components in the kit. |
| Sierra | 18-2772-1 | Aftermarket Cross-Reference |
| Mallory | 9-72931 | Aftermarket Cross-Reference |
| JLM Marine | 17400-87L00 | Aftermarket Cross-Reference |
Engine & Model Compatibility
Confirm your engine model in the table below.
For Volvo Penta engines, this kit fits the SX series models listed. Please verify that your drive is not an SX-A model, as this kit is not compatible.
| Brand | Model | Associated Kit PN | Notes |
|---|---|---|---|
| Volvo Penta | SX | 3853807 | Gimbal bearing; Not compatible with SX-A drives |
| Volvo Penta | SX-C | 3841481 | U-joint bellow |
| Volvo Penta | SX-M | 3850426 | Exhaust bellow |
| Volvo Penta | SX-R | 3852560 | Sealing kit |
Technical Specs
- Product Type
- Transom Seal Kit / Bellows Kit
- Installation
- Direct replacement
- Housing Material
- Rubber/Neoprene (bellows)
- Housing Color
- Black
- Warranty
- Varies by manufacturer (typically 1 year)
- Other Technical Attributes
- Meets or exceeds OEM specifications
What’s in the Box
- 1 x Gimbal bearing (Replaces OEM 3853807)
- 1 x U-joint bellow (Replaces OEM 3841481)
- 1 x Sealing kit (Replaces OEM 3852560)
- 1 x Exhaust bellow (Replaces OEM 3850426)
- 1 x Clamp
Installation Notes
- Ensure the engine is off and disconnect the battery for safety.
- Trim the stern drive to the full "up" or "trailer" position to access the bellows.
- Carefully remove the old exhaust bellow, U-joint bellow, and their associated clamps.
- Inspect the gimbal housing and remove the old gimbal bearing using an appropriate puller tool.
- Thoroughly clean all mating surfaces, removing any old sealant, corrosion, or debris.
- Install the new gimbal bearing squarely into the housing, ensuring it is properly seated.
- Fit the new U-joint and exhaust bellows, securing them with the new clamps provided.
- Confirm all components are securely fastened and properly aligned.
- Lower the drive and check for correct movement and ensure no components are binding.
- After launching the vessel, immediately check for any water leaks around the transom assembly.
- Professional installation is highly recommended for this component.
Troubleshooting & FAQ
Which Volvo Penta drives is this kit compatible with?
This kit is designed for Volvo Penta SX series stern drives, covering models SX, SX-C, SX-M, and SX-R.
Is this kit compatible with SX-A drives?
No, this kit is specifically not compatible with Volvo Penta SX-A drives. Ensure you have correctly identified your drive model before purchasing.
What are the signs my transom seal needs replacement?
Common signs of a failing transom seal include water leaking into the bilge area, visible cracks or dry rot on the rubber bellows, or a grinding noise from the gimbal bearing when turning the helm.
What are the main components included in this kit?
This kit includes the critical wear items for a transom service: one gimbal bearing, one U-joint bellow, one exhaust bellow, a sealing kit, and a clamp.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
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.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
Payment & Security
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