Transom Seal Kit for MerCruiser Bravo I, II & III Sterndrives – Replaces 30-803100T1, 8M0095485
Transom Seal Kit for MerCruiser Bravo I, II & III Sterndrives – Replaces 30-803100T1, 8M0095485 is backordered and will ship as soon as it is back in stock.
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Transom Seal Kit for MerCruiser Bravo I, II & III Sterndrives –...
Transom Seal Kit for MerCruiser Bravo I, II & III Sterndrives – Replaces 30-803100T1, 8M0095485 is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket Transom Seal Kit is designed for MerCruiser Bravo I, Bravo II and Bravo III sterndrives. The catalog application is listed as all Bravo drives from 1982 onward. It replaces Mercury Marine OEM part numbers 30-803100T1 and 8M0095485.
The kit is intended for service of the sterndrive-to-transom assembly, including replacement of sealing and bellows components during an overhaul. A greasable gimbal bearing is included as part of the kit configuration.
- For MerCruiser Bravo I, Bravo II and Bravo III sterndrives.
- Catalog application: all Bravo drives, 1982 and newer.
- Includes a greasable gimbal bearing.
- Aftermarket replacement kit; not a Mercury Marine OEM assembly.
Part Number Matrix
Use the verified OEM references below when comparing the original part and replacement application.
| Brand | Part Number | Role |
|---|---|---|
| Mercury Marine | 30-803100T1 | OEM replacement reference |
| Mercury Marine | 8M0095485 | OEM replacement reference |
| Sierra | 18-8212-1 | Aftermarket transom seal kit reference |
Engine & Model Compatibility
Fitment is determined by sterndrive family and service application rather than engine horsepower or stroke. Confirm the drive model and compare the original part before ordering.
| Brand | Drive Model | Years | Stroke / Rated HP | OEM Reference | Application Notes |
|---|---|---|---|---|---|
| MerCruiser | Bravo I | 1982 and newer | Not applicable to sterndrive fitment | 30-803100T1 / 8M0095485 | Verify drive model and original component before installation. |
| MerCruiser | Bravo II | 1982 and newer | Not applicable to sterndrive fitment | 30-803100T1 / 8M0095485 | Verify drive model and original component before installation. |
| MerCruiser | Bravo III | 1982 and newer | Not applicable to sterndrive fitment | 30-803100T1 / 8M0095485 | Verify drive model and original component before installation. |
Technical Specifications
- Product Type
- Transom Seal Kit
- Installation Location
- MerCruiser sterndrive transom and bell-housing assembly
- Compatible Drive Family
- MerCruiser Bravo I, Bravo II and Bravo III
- Catalog Application
- All Bravo drives, 1982 and newer
- Gimbal Bearing
- Greasable gimbal bearing included
- OEM Replacement References
- 30-803100T1 and 8M0095485
- Product Status
- Aftermarket replacement; not an OEM component
What’s in the Box
This is a complete transom seal kit configuration for the listed Bravo application.
- 1 x Greasable gimbal bearing
- Transom seal and bellows service components supplied for the Bravo application
Component packaging and small hardware may vary by production batch. Compare the supplied parts with the original assembly and service-manual requirements before installation.
Installation Notes
- Disconnect the boat battery and place the sterndrive in a safe service position.
- Remove the sterndrive from the bell housing according to the manufacturer’s service manual.
- Remove the existing bellows, seals and related hardware, noting clamp positions and component orientation.
- Inspect the transom assembly, bell housing, gimbal housing and mating surfaces for corrosion, damage or wear.
- Clean all mating surfaces and remove old sealant and debris.
- Remove the old gimbal bearing with a suitable bearing puller.
- Install the replacement greasable gimbal bearing squarely with the correct installation driver.
- Install the supplied seals, bellows and clamps in accordance with the service manual and confirm proper seating.
- Reinstall the sterndrive, align the driveshaft and torque fasteners to the manufacturer’s specifications.
- After assembly, inspect the installation for leaks and confirm normal drive operation before regular use.
Troubleshooting & FAQ
How do I know if this kit fits my Bravo drive?
The catalog application is all MerCruiser Bravo drives from 1982 onward, including Bravo I, Bravo II and Bravo III. Confirm the drive model and compare the original part number, component layout and bearing configuration before ordering.
What are common signs that the transom seals or bellows need replacement?
Common signs include water entering the bilge near the transom, visible cracking or deterioration of the bellows, corrosion around the transom assembly, or abnormal gimbal-bearing noise during operation.
Is a special tool needed to install the gimbal bearing?
Professional installation is recommended. A suitable bearing puller is normally required for removal, and a proper bearing installation driver should be used to install the new bearing straight without damaging it.
How often should the bellows and transom seals be inspected?
Inspect them at least annually and whenever the sterndrive is removed. Replace components at the first sign of cracks, hardening, abrasion, water intrusion or other deterioration.
Is this an OEM kit?
No. This is an aftermarket replacement kit for the listed Mercury Marine OEM references. It should be compared with the original parts and installed according to the applicable service manual.
What should I do if the supplied components differ from my original parts?
Do not force installation or substitute unrelated components. Stop and confirm the sterndrive model, original part number and service-manual requirements before proceeding.
Safety & Important Information
- Verify the Bravo drive model and OEM reference before purchase.
- This product is an aftermarket replacement, not a Mercury Marine OEM component.
- Use the manufacturer’s service manual for removal, installation, torque values and sealant requirements.
- Professional marine-service installation is recommended.
About Sea Sierra
- Marine Replacement Parts — We supply replacement components for common marine service applications.
- Fitment-Focused Support — Compare your original component, drive model and OEM reference before ordering.
- Global Fulfillment — Standard and expedited shipping options are shown at checkout when available for your region.
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