SKU: 80386256688

27-804908A00 Gasket Set Lower Unit Kit for Mercury 8HP 9.9HP 4-Stroke | JLM Marine

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Description

27-804908A00 Gasket Set Lower Unit Kit for Mercury 8HP 9.9HP 4-Stroke | JLM Marine27 804908A00 Gasket Set Lower Unit Kit for Mercury 8HP 9. 9HP 4 Stroke JLM Marine This Lower Unit Gasket Set is engineered to deliver a perfect fit and reliable performance for Mercury 8HP and 9. 9HP 4 stroke outboard engines. Designed as a direct replacement for OEM seal kits, it ensures a seamless installation and leak free operation for your lower unit assembly. This kit directly replaces Mercury part numbers 27 804908A00, 27 8M0082883, 27

27-804908A00 Gasket Set Lower Unit Kit for Mercury 8HP 9.9HP 4-Stroke | JLM Marine

This Lower Unit Gasket Set is engineered to deliver a perfect fit and reliable performance for Mercury 8HP and 9.9HP 4-stroke outboard engines. Designed as a direct replacement for OEM seal kits, it ensures a seamless installation and leak-free operation for your lower unit assembly.

This kit directly replaces Mercury part numbers 27-804908A00, 27-8M0082883, 27-8M0065830, 27-804908A02, and 27-8M0060176, providing broad compatibility across multiple Mercury lower unit configurations.

  • Comprehensive gasket and seal kit for complete lower unit service
  • Precision-engineered to OE specifications for reliable sealing
  • Fits Mercury 8/9.9 HP 4-stroke outboards (serial R042475 & up)

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket applications:

Brand Part Number Notes
Mercury 27-804908A00 Primary OEM reference
Mercury 27-8M0082883 Alternate OEM number
Mercury 27-8M0065830 Cross-reference
Mercury 27-804908A02 Cross-reference
Mercury 27-8M0060176 Cross-reference

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 Serial Range
Mercury Mariner 8 / 9.9 HP 4-Stroke R042475 & Up

Technical Specifications

Specification Value
Product Type Lower Unit Gasket & Seal Kit
Application Lower Unit Assembly
Compatibility Mercury 8HP / 9.9HP 4-Stroke Outboards
OEM Replacement Numbers 27-804908A00, 27-8M0082883, 27-8M0065830, 27-804908A02, 27-8M0060176

Package Contents

This kit includes:

  • 1× Lower Unit Seal Gasket Kit
  • The package contains all the parts shown in the product picture

Installation Guide

  1. Disconnect the outboard motor from the power source and allow it to cool completely.
  2. Drain all gear oil from the lower unit into an appropriate container.
  3. Remove the propeller, then unbolt and separate the lower unit from the mid-section housing.
  4. Carefully disassemble the lower unit components, noting the position of each seal and gasket.
  5. Clean all mating surfaces thoroughly, removing old gasket material and debris with a scraper and solvent.
  6. Inspect all surfaces for corrosion, warping, or damage that may prevent proper sealing.
  7. Install new gaskets and seals from this kit in the exact positions of the originals, ensuring correct orientation.
  8. Apply a thin coat of marine-grade grease to seals to aid installation and prevent damage during assembly.
  9. Reassemble the lower unit components, following your service manual's torque specifications for all fasteners.
  10. Reattach the lower unit to the mid-section, ensuring proper alignment and torquing all mounting bolts to spec.
  11. Refill the lower unit with the manufacturer-recommended gear oil through the fill port until it reaches the vent hole.
  12. Reinstall the propeller, run the engine briefly, then recheck the gear oil level and inspect for leaks.

Troubleshooting & FAQ

Q: How do I confirm this gasket set fits my Mercury outboard?
A: Check your engine's serial number (located on the mounting bracket) and confirm it is R042475 or higher for 8HP/9.9HP 4-stroke models. Cross-reference your current part number against the five OEM numbers listed above to ensure compatibility.

Q: How often should I replace the lower unit gaskets and seals?
A: Replace gaskets and seals whenever you perform lower unit service, disassembly for propeller shaft work, or if you notice gear oil leaks or milky oil indicating water intrusion. Most manufacturers recommend lower unit service every 100 hours or annually.

Q: What are the signs that my lower unit seals have failed?
A: Common symptoms include gear oil that appears milky (water contamination), visible oil leaks around the lower unit housing, difficulty shifting gears, unusual noise from the gearcase, or rapid gear oil loss between service intervals.

Q: Can I reuse the old gaskets if they look intact?
A: No, gaskets are designed for single use only. Even if they appear undamaged, they compress during initial installation and will not seal properly when reused, leading to leaks and potential water intrusion into the lower unit.

Q: Do I need any special tools to install this gasket set?
A: You'll need basic hand tools (sockets, wrenches, screwdrivers), a torque wrench, gasket scraper, marine-grade grease, and the appropriate gear oil. A service manual for your specific engine model is highly recommended for proper torque specifications and assembly procedures.

Q: What's the difference between OEM and aftermarket gasket sets?
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.
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: 80386256688

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This was a slow moving book. Lots of character pov chapters, lots of superfluous descriptions and endless courtly appearances stalled this book to start. Once you get into the heart of the story, it takes off. Before you know it the book is done. My favorite character is Reyna. She is so strong. She is true to herself. She gets into a lot of trouble with her headstrong ways but it's entertaining. I have high hopes for Lorcan. He is honorable to a fault. Thane had turned out to be better than I thought but i still don't like him. Eislin is useless. Great plot twists at the end. I'm looking forward too book 2.
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Reviewed in the United States on June 6, 2020
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Faifre6
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★★★★★ 5
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Isabelle
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★★★★★ 4
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This was a very captivating book once you got into it thoroughly. But the third person perspective was a bit hard to get used to. But as you got into it and followed the different characters, it was interesting and filled with intrigue, conflict and forbidden love. I can’t wait to read the next one and to complete the series.
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Reviewed in the United States on November 12, 2022
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Reviewed in the United States on April 1, 2024
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Luna Fae
Natrona Heights, US
★★★★★ 4
Right from the start, I was drawn in by the prologue!!!
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Queen of Roses (Blood of a Fae #1) by Briar Boleyn Genre General Fiction ( Adult), Romance, Sci-Fi & Fantasy, Dark Romance “More primordial than the stars. My name was on his lips as he promised unspeakable darkness to any who came between us.” Right from the start, I was drawn in by the prologue!!! I’m a big fan of “touch her, and you die” vibes, but I mean, what’s also not to love about a unique Arthurian retelling with gender twists, a treacherous royal court, a dangerous quest, magical Fae & mystical monsters, entwined with a bit of spice! Morgan, Princess of Pendrath and true heir to the throne has spent most of her life dimming her light to feel safe and to make others comfortable. She is treated as an outcast in the court and repressed by her family due to the blood of the Fae within her and forced to join the Temple of the Three as a priestess in training to one day replace Merlin. Her brother, King Arthur, who reminds me of Joffrey from Game of Thrones, later tells her that he has other plans and offers her a choice of the Temple or to marry her off for political gain, unless… that is, she can journey through the great unknown and return with a long-lost fae weapon with enchanted powers known as Excalibur. Her quest begins with a roguish crew that includes the mysterious, arrogant, and heart-tuggingly handsome Captain of the Royal Guard, Kairos Draven, whom she can’t decide if she wants to stab or indulge in pleasure with. Along the way are plenty of surprises, mystical creatures, and betrayal, all while Morgan uncovers more of the truth about herself and who she can trust. This book had intriguing storylines and lovable characters that kept me turning pages and wanting more. I can’t wait to see how it all unfolds and comes together in book 2, Court of Claws, which I just started reading!! Read if you’re into- Dark Fantasy/Romance Slow–Burn Question Everything Magic and Action Fae Arthurian Legend Stabby/Broken FFC Morally Gray MMC Forced Proximity Queen of Roses is perfect for Holly Black, Jennifer L. Armentrout, and Sarah J. Maas fans. Please check the trigger warnings page in the table of contents before reading this book.
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