SKU: 97730515170

Transom Seal Kit – Fits MerCruiser R/MR/Alpha One Gen I Stern Drives (Replaces 30-803098T1)

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Description

Transom Seal Kit – Fits MerCruiser R/MR/Alpha One Gen I Stern Drives (Replaces 30-803098T1)Transom Seal Kit Fits MerCruiser R MR Alpha One Gen I Stern Drives (Replaces 30 803098T1) This transom seal kit provides the essential components needed to service MerCruiser R, MR, and Alpha One Generation I stern drives produced from 1983 to 1991 (serial numbers 6225577 through 0D469858). It is engineered to meet or exceed OEM specifications for a reliable, leak free seal. This kit is a direct replacement for multiple industry part numbers, ensuring

Transom Seal Kit – Fits MerCruiser R/MR/Alpha One Gen I Stern Drives (Replaces 30-803098T1)

This transom seal kit provides the essential components needed to service MerCruiser R, MR, and Alpha One Generation I stern drives produced from 1983 to 1991 (serial numbers 6225577 through 0D469858). It is engineered to meet or exceed OEM specifications for a reliable, leak-free seal.

This kit is a direct replacement for multiple industry part numbers, ensuring wide compatibility and a straightforward installation process for a complete transom reseal and gimbal bearing replacement job.

  • Complete Service Kit: Includes all necessary bellows, gimbal bearing, gaskets, seals, and clamps for a full transom service.
  • Direct Replacement: Designed to replace Mercury Marine P/N 30-803098T1 and other equivalent aftermarket parts without modification.
  • Durable Construction: Made with high-quality rubber, plastic, and metal components to withstand the harsh marine environment.

Part Number Cross-Reference

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

Brand Part Number
Mercury Marine 30-803098T1
Sierra 18-8205
Sierra 18-8217
GLM 21951
Mallory 9-72901
Redline RL8205

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 R/MR/Alpha One (Sterndrive) N/A 4-Stroke 1983-1991 30-803098T1 Serial #s: 6225577-0D469858
MerCruiser R/MR/Alpha One (Transom Assembly) N/A 4-Stroke 1983-1991 30-803098T1 Serial #s: 6216687-0D469858

Technical Specifications

Specification Value
Product Type Transom Seal Kit
Installation Direct replacement
Housing Material Rubber, metal, plastic
Housing Color Black
Other Technical Attributes For use with exhaust tube configuration

Package Contents

  • 1 x Heavy Duty Gimbal Bearing (Replaces 18-2100 / 30-60794A4)
  • 1 x U-Joint Bellows (Replaces 18-2751 / 60932A4)
  • 1 x Shift Cable Bellows (Replaces 18-2753-1 or 18-2753-2 / 74639)
  • 1 x Exhaust Tube (Replaces 18-2760 / 78458A1) Note: This exhaust tube uses a single hose clamp on the transom side, which may result in a louder exhaust sound than the OEM dual-clamp setup.
  • 1 x Water Intake Hose, 3/4" (Replaces 18-3601 / 32-32461)
  • 1 x Water Intake Hose, 5/8" (Replaces 18-3602 / 32-41725-33)
  • 1 x Outdrive Mounting Gasket Kit (Replaces 18-2743 / 27-94996-2)
  • 2 x Bell Housing Gasket (Replaces 18-2840 / 27-35982)
  • 1 x O-Ring (Replaces 18-7153 / 25-25439)
  • 1 x O-Ring (Replaces 18-7117 / 25-35027)
  • 1 x O-Ring (Replaces 18-7170 / 25-33504)
  • 2 x Hose Clamp (Replaces 18-7310)
  • 1 x Hose Clamp (Replaces 18-7312)
  • 1 x Bellows Clamp (Replaces 18-7321 / 54-38863)

Installation Guide

  1. Safety First: Disconnect the boat's battery before starting any work.
  2. Remove Drive: Carefully detach and remove the MerCruiser stern drive unit according to the manufacturer's service manual.
  3. Disassemble Transom Components: Remove the old bellows (U-joint, shift, and exhaust), gimbal bearing, and water hoses from the transom housing.
  4. Clean Surfaces: Thoroughly clean all mounting surfaces on the transom and bell housing, removing any old gasket material or sealant.
  5. Install Bearing: Use a gimbal bearing driver tool to properly install the new heavy-duty bearing into the gimbal housing.
  6. Install Bellows: Install the new U-joint, shift cable, and exhaust bellows. Ensure they are correctly seated and secure all connections with the provided clamps.
  7. Install Hoses and Gaskets: Fit the new water intake hoses and place the new gaskets and O-rings in their designated positions. Use appropriate marine-grade adhesive where required.
  8. Reinstall Drive: Carefully reinstall the stern drive unit, ensuring proper alignment of the driveshaft and shift cable.
  9. Final Checks: Reconnect the battery. Once in the water, check for any leaks around the transom assembly and test the drive for proper shifting and operation.

Troubleshooting & FAQ

How do I confirm this kit fits my MerCruiser stern drive?
This kit is compatible with MerCruiser R, MR, and Alpha One Generation I models from 1983 to 1991. To ensure a perfect match, verify your drive's serial number falls within the range of 6225577 to 0D469858 for sterndrives or 6216687 to 0D469858 for transom assemblies.

What is the difference between this kit's exhaust setup and the original OEM part?
The exhaust tube in this kit is designed for a single hose clamp on the transom side, which is a common aftermarket configuration. This may result in a slightly louder exhaust noise compared to the original dual-clamp OEM setup, but does not affect performance.

What are the signs that my transom seal kit needs to be replaced?
Common signs of failure include water leaking into the bilge area through the transom, a roaring or grinding noise from the gimbal bearing when turning the wheel, or visible cracks and deterioration in the U-joint or shift bellows.

Is everything I need for the job included in this kit?
This kit provides a comprehensive set of bellows, the gimbal bearing, gaskets, O-rings, and clamps needed for a typical transom service. You will still need appropriate marine-grade sealant/adhesive and standard mechanic's tools for installation.

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: 97730515170

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ynk
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★★★★★ 3
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I have one of these that has made it through 2 dogs but now the bungee is stretched out. It's been such a well loved toy I recently got another one. They've changed the plush fabric. The old one was indestructible. This new one is much thinner and easily torn. I wish they would go back to the old plush fabric.
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Reviewed in the United States on February 4, 2024
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Donna
Waukegan, US
★★★★★ 5
Great Toy!
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This has been a great toy for our 11 week old German Shepherd. She absolutely loves it. I can get out all of her toys and lay them out with the exception of her "Lizzy" and she will immediately go to her toy bin and get it herself. Needless to say it is her favorite toy. She has had it a week now and she plays with it a lot, chewing and squeaking. It's a pretty amazing toy to have held up this long already and to date shows no sign of wear or damage. Lizzy just keeps going and going.
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Reviewed in the United States on April 4, 2014
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Anna Rita
Bozeman, US
★★★★★ 1
This item came with plush missingand thread unraveling on one leg
Color: Blue
I bought this toy because my dog spent a week playing with the same toy from Zanies that belonged to a visiting dog. My dog was very gentle with this toy, which he loved, so we decided to find one for him. The toy that arrived had no Zanies label and missing plush on the bottom where the label should have been, plus other bare spots in the area that showed the white mesh beneath. It also had a long thread at the joint of a rear leg so I knotted it at the joint and clipped it to prevent my dog from pulling at it but it's apparent that the sewing is loose and wont last long. The color was also much lighter than the toy he'd been playing with that belonged to the guest dog but I figured it might just be from a different dye lot (it was not bought at Amazon but their local pet store.) I am not convinced this is a real Zanies toy. There were two labels in French and it said it was made in China. I am returning this toy and will get a replacement and see how it looks. If it seems like it will fall apart or is not the real thing I will return it immediately. If it has a label and is in good shape and sewn well at the seams I'll revise this review.
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Reviewed in the United States on August 4, 2020
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Neil Ginsberg
Los Angeles, US
★★★★★ 5
Fantastic Dog Toy!!!
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