SKU: 40311012085

Transom Seal Bellows Kit – Fits MerCruiser Alpha One Gen 2 Stern Drives (Replaces 803099T1)

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Description

Transom Seal Bellows Kit – Fits MerCruiser Alpha One Gen 2 Stern Drives (Replaces 803099T1)Transom Seal Bellows Kit Fits MerCruiser Alpha One Gen 2 Stern Drives This comprehensive transom seal and bellows kit is designed for MerCruiser Alpha One Generation 2 stern drives manufactured from 1991 and up, specifically for serial numbers 0D469859 and higher. It provides all the essential components to replace worn or damaged seals, bellows, and the gimbal bearing, restoring the integrity of your transom assembly. This kit serves as a direct

Transom Seal Bellows Kit – Fits MerCruiser Alpha One Gen 2 Stern Drives

This comprehensive transom seal and bellows kit is designed for MerCruiser Alpha One Generation 2 stern drives manufactured from 1991 and up, specifically for serial numbers 0D469859 and higher. It provides all the essential components to replace worn or damaged seals, bellows, and the gimbal bearing, restoring the integrity of your transom assembly.

This kit serves as a direct replacement for a range of OEM and aftermarket part numbers, ensuring wide compatibility for the specified MerCruiser models. It addresses the most common failure points, including bellows cracks and bearing wear, which can lead to water intrusion and drive damage.

  • Complete Kit: Includes drive shaft bellows, exhaust bellows, shift cable bellows, gimbal bearing, gaskets, seals, and a water hose.
  • Application: Specifically fits MerCruiser Alpha One Gen 2 stern drives (1991+).
  • Material: Components are made from high-quality neoprene rubber and durable metals to meet or exceed OEM specifications.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Brand Part Number
Mercury / MerCruiser 30-803099T1 / 803099T1
Sierra 18-8206-1 / 18-8218
Mallory 9-72900 / 9-72904 / 9-72906
Red Rhino MR-907

Compatible Engine Models

Confirm your engine model/year in the table below. For Mercury owners, here’s a guide to help you identify your engine’s serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.

Brand Model Rated HP Stroke Years OEM Part No. Notes
MerCruiser Alpha One Gen 2 Various 4-Stroke 1991 and up 803099T1/30-803099T1 Serial numbers 0D469859 and up

Technical Specifications

Specification Value
Product Type Transom Seal/Bellows Kit
Installation External/Transom Mounted
Connection Direct Mount to Transom/Gimbal Housing
Housing Material Neoprene (Rubber)
Housing Color Black
Dimensions 12.32 × 7.44 × 6.18 inches (312.9 × 189 × 157 mm)
Weight 4.4 pounds (2 kg)
Fitting Type Mechanical Clamp
Warranty Standard Manufacturer Warranty
Other Technical Attributes Seals the transom opening between the boat and stern drive

Package Contents

  • 1 × Drive Shaft Bellows (Replaces 816431A1)
  • 1 × Exhaust Bellows Assembly (Replaces 18654A1 / 8M0124227)
  • 1 × Shift Cable Bellows Assembly (Replaces 74639A2)
  • 1 × Gimbal Bearing (Replaces 879194A02 / 30-879194A01 / 30-862540A3)
  • 1 × Water Hose 3/4" (Replaces 32-41725 / 32-8M0062309 / 8M0215001)
  • 2 × Bell Housing Gasket Kit (Replaces 27-94996T2 / 27-94996Q2 / 8M0091545)
  • 1 × Gimbal Housing Oil Seal (Replaces 26-88416)
  • 1 × Gimbal Housing Seal (Replaces 41802)
  • 1 × Bell Housing Shaft Lever (Replaces 45518A3)
  • 1 × Shift Cable Guide (Replaces 43433)
  • 1 × Shift Cable Insert (Replaces 14705)
  • 1 × Shift Cable Wrapping (Replaces 38473)

Installation Guide

  1. Safety First: Disconnect the boat's battery. Place the stern drive in the full "trailer" trim position to access the components.
  2. Remove Stern Drive: Unbolt and carefully remove the entire stern drive assembly from the gimbal housing to expose the transom assembly.
  3. Remove Old Bellows: Using a utility knife, carefully cut the old drive, exhaust, and shift cable bellows. Remove the old clamps and bellows material.
  4. Extract Gimbal Bearing: Use a slide hammer with a bearing puller attachment to extract the old gimbal bearing from the housing.
  5. Clean Surfaces: Thoroughly clean the gimbal housing and transom assembly, removing any old sealant, gasket material, or debris.
  6. Install New Bearing: Align and install the new gimbal bearing using a bearing installation tool. Ensure it is fully seated and the grease hole is correctly aligned if applicable.
  7. Install Bellows: Install the new shift cable, drive shaft, and exhaust bellows. Apply a suitable marine adhesive sealant to the mounting flanges.
  8. Secure Clamps: Secure all three bellows with the provided clamps, ensuring they are tight enough to create a waterproof seal.
  9. Replace Seals & Gaskets: Install the new gaskets and seals on the bell housing before reinstalling the drive.
  10. Reinstall Drive: Carefully reinstall the stern drive assembly, ensuring correct alignment of the drive shaft and shift cable. Torque bolts to manufacturer specifications.
  11. Final Checks: Reconnect the battery. Test the trim and steering functions. Finally, check for any water leaks around the transom assembly after launching the boat.

Troubleshooting & FAQ

How do I confirm this fits my engine?
This kit is designed specifically for MerCruiser Alpha One Gen 2 stern drives from 1991 and newer with a serial number of 0D469859 or higher. The most reliable method is to cross-reference your existing part numbers with those listed in our cross-reference table.

What are the signs my transom seal kit needs replacing?
Common signs of failure include visible cracks, tears, or dry rot in the rubber bellows. Other indicators are water entering your bilge, a grinding or rumbling noise from the gimbal bearing (especially when turning), or difficulty shifting, which could point to a worn shift cable bellows.

What is the difference between kits with greasable and non-greasable gimbal bearings?
This kit includes a greasable gimbal bearing (similar to Sierra 18-8206-1). This design allows for periodic lubrication via a zerk fitting, which can extend the bearing's service life compared to permanently sealed bearings.

OEM vs. Aftermarket?
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.

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

What is your warranty and return policy?
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.
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 40311012085

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I.Spearman
West Palm Beach, US
★★★★★ 4
Quick plot twist
Format: Kindle
Ok so for starters I was obsessed with Crux from the start. An underworld boss? Sign me up. The obsession of love and protection he has for Alyx is a dream. Dark, protective, possessive, and obsessed ? Yes yes and yes. Love the character development from Our FMC. Alyx the Assassin that doesn’t back down and oozes confidence. Yes please again! I loved the slow cracks in her armor letting her feel love from all sides , everyone of her men gave her someone thing she needed. Joha kinda grew in to the king he needed to be but let’s be fareal he would have died tripping up the stairs if it wasn’t for Orion, Crux , and Alyx. Orions passion and dominance wooo. I love a good hard love making with a softy. Letting himself finally love Alyx but still be that rock of protection was very cute. WHAT I DIDNT like was the random plot twist with the atlas being alive?!? And then dying 5 minutes later. Spareeeeee me! That could have been a great story of the thrown being over taking , Alyx finding her way back. Her men bonding more and Joha finally being a badass and leading the riot/ rebellion to take his thrown back. I didn’t like the fast forward quick ending. Like oh yeah I was saved by sailor and poof here I am back from the dead and oh yeah brother take this slow stabbing in your chest. Nope . But overall this was a nice read . MMFM my fav.
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Reviewed in the United States on October 5, 2024
C
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Chelsea
Phoenix, US
★★★★★ 5
Another win for this writing duo!
Format: Kindle
I loved this book. I love everything about this book and these characters. Alyx was such a strong female lead. She took no crap from anyone and was such a badass. I also loved that even though she was strong and independent, she allowed herself to be vulnerable when the tines were right, and i enjoyed seeing her growth throughout the story. Joha had me obsessed from the very second he appeared on page. I adore his loving nature but appreciate that he did what he had to do in the long run. His innocent personality often had me swoonig for him. He is such a romantic and probably my favorite of the three. Orion was a character i grew to love. At first, I wasn't crazy about him at all, but as the story progressed, so did my love for him. His sense of duty to protect his king and best friend made me respect him, and his character was well written. And then there is Crux, another character that i was instantly intreagued in. I knew instantly i would love him, and i was correct. His possesivness, his willingness to do anything for Alyx, and his filthy mouth had me in a chokehold. The plot of this book had me guessing what was going to happen all the way to the end. I didn't see some of the twists, which is hard as im very good at predicting outcomes. Im glad it was able to end the way it did. I was worried there for a little bit. But i adore the ending, and i would love to see more of these characters.
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Reviewed in the United States on September 16, 2024
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Lisa M
Dallas, US
★★★★★ 3
3.0
Format: Kindle
I enjoyed the story but found the rotation of chapters by characters broke the flow of the story. Choppy! Choppy!
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Reviewed in the United States on September 17, 2024
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CH
Cuba, US
★★★★★ 4
A bit disappointed
Format: Kindle
I'm a huge fan of romantasy and I'm thrilled to see more RH romantasy books coming out. I also enjoy a good standalone and these are two of my favorite authors. Everything seemed like it should have added up to make a perfect book here...but I ended up feeling a bit disappointed. The world is interesting and Alyx is the kind of FMC that I love. It's the lack of background on the male leads and, well, everything else that left me disappointed. Joha has a bit of a background story as it's central to the main plot..but Orion and Crux seem to have just popped into existence as full formed characters. I have no idea if they had families or friends before. Orion's entire personality is centered around protecting Joha and Crux's life is centered around Alyx. That's all I know about them. Then there were some glaring inconsistencies. Atlas was Atticus earlier in the book. His backstory and how he planned everything is never explained. He just appears as the mastermind. There were no hints or lead ups that he might appear. It felt like the authors needed a villain to be the mastermind and he fit. There were several other issues, but I won't drone on. Basically, it was a good book that missed the mark on being great. I think if it has been a trilogy or even a duet then the authors could have spent more time delving into the back stories of the characters and making everything feel believable. As it stands, it's good and I'll probably buy a hardcopy for my library but I don't think it'll be a book that I reread frequently.
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Reviewed in the United States on October 9, 2024
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L&S
Phoenix, US
★★★★★ 5
Not my typical read, but it was really good
Format: Kindle
This is not my typical type of genre, but I found it to be really good. I really enjoyed the female assassin and king romance with the time and storyline. The intricate relationship was not one I expected but also good and added spice to the storyline. Now, the only thing that would have made it sweeter would have been an epilogue on the Mother Queen. Call me vengeful, but she needed more than what was done to her. I wanted to see a snipit of her life in misery. 🤣
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Reviewed in the United States on March 2, 2025

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