30-803099T1 Transom Bellows Repair Reseal Kit for MerCruiser Alpha 1 Gen 2 | JLM Marine

30-803099T1 Transom Bellows Repair Reseal Kit for MerCruiser Alpha 1 Gen 2

This comprehensive transom bellows repair reseal kit is designed for MerCruiser Alpha 1 Generation 2 stern drives, fitting units from approximately 1991 and up. It provides a complete solution for replacing all rubber parts and the gimbal bearing in the gimbal housing on the transom, ensuring proper sealing and reliable operation of your outdrive system.

This kit directly replaces OEM part number 30-803099T1 and aftermarket equivalent 18-8206-1, delivering all critical components needed for a thorough transom service in one package.

• Complete replacement of all transom rubber components and gimbal bearing
• Includes drive shaft bellows, exhaust bellows assembly, shift cable bellows, and gimbal bearing
• Fits MerCruiser #1 drives and Alpha One Generation 2 (1991+)

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.

Technical Specifications

Package Contents

This complete transom repair reseal kit includes the following components:

• Drive Shaft Bellows – Part # 816431A1
• Exhaust Bellows Assembly – Part # 18654A1
• Bearing Assembly (Gimbal Bearing) – Part # 30-862540A3 (superseded to 30-879194A01)
• Shift Cable Bellows Assembly – Part # 74639A2
• Water Hose – Part # 32-4172533 (superseded to 32-8M0062309)
• Alpha Outdrive Mounting Gasket Kit – Part # 27-94996Q2

Installation Guide

1. Disconnect the battery and remove the outdrive from the transom assembly following your engine's service manual.
2. Remove the old gimbal bearing from the gimbal housing using a bearing puller or press. Clean the housing thoroughly.
3. Install the new gimbal bearing (30-879194A01) using a bearing driver or press, ensuring it seats fully and squarely.
4. Remove the old shift cable bellows, exhaust bellows, and drive shaft bellows from the transom and outdrive components.
5. Inspect all mounting surfaces for corrosion, damage, or debris and clean thoroughly before installation.
6. Install the new shift cable bellows assembly (74639A2) onto the shift cable and secure with the provided clamps.
7. Install the new exhaust bellows assembly (18654A1) between the exhaust housing and gimbal housing, tightening clamps securely.
8. Install the new drive shaft bellows (816431A1) onto the drive shaft housing and gimbal ring, ensuring proper alignment.
9. Replace the water hose (32-8M0062309) connecting the outdrive to the cooling system.
10. Apply the new outdrive mounting gasket kit (27-94996Q2) to ensure a watertight seal between the outdrive and transom.
11. Reinstall the outdrive to the transom assembly, torquing all fasteners to manufacturer specifications.
12. Reconnect the battery, perform a function test of the trim and shift systems, and inspect for leaks during initial operation.

Troubleshooting & FAQ

Q: How do I know if this kit fits my MerCruiser stern drive?
A: This kit is designed for MerCruiser Alpha 1 Generation 2 drives, typically from 1991 and up. Verify your drive model and year, and compare the part numbers listed (30-803099T1 or 18-8206-1) with your original components to ensure compatibility.

Q: How often should I replace the bellows and gimbal bearing?
A: It's recommended to inspect bellows annually for cracks, tears, or leaks, and replace them every 2–3 years or sooner if damage is found. The gimbal bearing should be replaced whenever bellows are serviced or if roughness, noise, or play is detected.

Q: What are the signs that my transom bellows need replacement?
A: Common symptoms include water in the bilge, visible cracks or tears in the rubber bellows, corrosion around the gimbal housing, difficulty steering, or unusual noises during operation. Inspect bellows regularly to prevent water intrusion and costly damage.

Q: Can I install this kit myself or do I need a professional?
A: Installation requires removing the outdrive, pressing out the old gimbal bearing, and installing new bellows with proper alignment and torque specs. If you have mechanical experience and the right tools, it's manageable; otherwise, professional installation is recommended for safety and reliability.

Q: What's the difference between OEM and aftermarket bellows kits?
A: 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.

Q: How fast do you ship and how much does it cost?
A: 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.

Q: What is your warranty and return policy?
A: 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.