SKU: 99893341358

Upper Gear Housing Seal Kit – Fits MerCruiser R, MR & Alpha One Gen I Drives (Replaces 26-32511A1, 18-2648)

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Description

Upper Gear Housing Seal Kit – Fits MerCruiser R, MR & Alpha One Gen I Drives (Replaces 26-32511A1, 18-2648)Upper Gear Housing Seal Kit Fits MerCruiser R, MR & Alpha One Gen I Drives This comprehensive seal kit is designed for MerCruiser #1, R, MR, and Alpha One Gen I sterndrives manufactured from 1964 through 1991 (serial numbers 1684188 to D469858). It contains all the necessary gaskets, o rings, and seals to service the upper gear housing unit, preventing water intrusion and oil leaks. This kit is a direct replacement for multiple OEM and aftermarket

Upper Gear Housing Seal Kit – Fits MerCruiser R, MR & Alpha One Gen I Drives

This comprehensive seal kit is designed for MerCruiser #1, R, MR, and Alpha One Gen I sterndrives manufactured from 1964 through 1991 (serial numbers 1684188 to D469858). It contains all the necessary gaskets, o-rings, and seals to service the upper gear housing unit, preventing water intrusion and oil leaks.

This kit is a direct replacement for multiple OEM and aftermarket part numbers, including Mercury 26-32511A1, 26-32511A3, 26-32511B1, Sierra 18-2648, GLM 87500, and Mallory 9-74303.

  • Provides a complete solution for resealing the upper gearcase.
  • Engineered as a direct, model-specific replacement for a reliable fit.
  • Some included seals feature stainless steel OD construction for enhanced durability.

Part Number Cross-Reference

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

Brand Part Number
Mercury 26-32511A1
Mercury 26-32511A3
Mercury 26-32511B1
Sierra 18-2648
GLM 87500
Mallory 9-74303

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 #1 / Model 1 Various 4-Stroke 1964-1966 26-32511A1 Serial #1684188-2065189
MerCruiser #1A, 1B, 1C & EZ Shift Various 4-Stroke 1964-1966 26-32511A1 Serial #1684188-2065189
MerCruiser 120 120 4-Stroke 1967-1982 26-32511A1 Serial #2062141-6225576
MerCruiser 140 140 4-Stroke 1967-1982 26-32511A1 Serial #2062141-6225576
MerCruiser 160/165 160/165 4-Stroke 1967-1977 26-32511A1 Serial #2065190 and up
MerCruiser 470 170/190 4-Stroke 1976-1982 26-32511A1 Serial #4208730-6225576
MerCruiser 485 185/200 4-Stroke 1976-1982 26-32511A1 Serial #4208730-6225576
MerCruiser 888 200/240 4-Stroke 1971-1977 26-32511A1 Serial #3106717 and up
MerCruiser 898/228/250/260 Various 4-Stroke 1977-1982 26-32511A1 Serial #4782330-4898729
MerCruiser R/MR Various 4-Stroke 1983-1991 26-32511A1 Serial #6225577 and up
MerCruiser Alpha One Various 4-Stroke 1983-1991 26-32511A1 Serial #6225577 and up
MerCruiser Alpha One SS Various 4-Stroke 1986-1989 26-32511A1 Serial #0A545004 and up
MerCruiser SSM II/III/IV/V Various 4-Stroke 1982-1995 26-32511A1

Technical Specifications

Specification Value
Product Type Upper Unit Gear Housing Seal Kit
Installation Direct replacement
Housing Material Rubber/Synthetic components
Housing Color Black
Other Technical Attributes Contains stainless steel OD seals in some aftermarket versions
Warranty Varies by manufacturer

Package Contents

1 x Upper Gear Housing Seal Kit containing:

  • 1 x Grommet (26-38970)
  • 1 x Gasket (27-55810-1)
  • 2 x Gasket (12-19183-3)
  • 1 x O-ring (25-55801)
  • 1 x O-ring (25-32546)
  • 1 x O-ring (25-25439)
  • 1 x O-ring (25-70937)
  • 1 x Oil Seal (26-32511)
  • 1 x Oil Seal (26-823894)
  • 1 x Oil Seal (26-96503-1)
  • 1 x Seal (26-45577-1)
  • 1 x Grommet (26-36557)

Installation Guide

  1. Drain the gear lube completely from the sterndrive.
  2. Separate the upper and lower units of the sterndrive assembly.
  3. Carefully remove the upper gear housing cover to access the internal components.
  4. Take photos of the old seals and their orientation before removal to use as a reference.
  5. Use appropriate seal pullers or tools to carefully extract the old seals, gaskets, and o-rings.
  6. Thoroughly clean all sealing surfaces, ensuring they are immaculate and free of old gasket material or corrosion.
  7. Compare the new components from the kit with the old ones to confirm an exact match.
  8. Install the new o-rings and gaskets onto the housing and cover.
  9. Lightly lubricate the new oil seals with clean gear lube and press them into place using a seal driver.
  10. Reassemble the gear housing, making sure to torque all fasteners to the manufacturer's specifications.
  11. Rejoin the upper and lower units and refill the sterndrive with fresh, manufacturer-recommended gear lube.
  12. After refilling, inspect carefully for any signs of leaks before operating the vessel.

Troubleshooting & FAQ

Q: How do I know if this seal kit will fit my sterndrive?

A: This kit is specifically designed for MerCruiser #1, R, MR, and Alpha One Gen I drives from 1964–1991. The most reliable way to confirm fitment is to check your drive's serial number; it should fall between 1684188 and D469858. You can also use the cross-reference table to match your existing part number.

Q: What are the signs that my upper gear housing seals are failing?

A: Common signs of seal failure include milky or water-contaminated gear lube (which looks like chocolate milk), a visible oil leak around the upper housing, or a persistent low gear lube level without an obvious external leak.

Q: Are these seals different from the original OEM ones?

A: Our seals are manufactured to meet or exceed OEM specifications for fit and function. Additionally, some versions in our kits feature upgrades like double-lip seals or stainless steel outer casings for improved durability and sealing performance compared to original single-lip designs.

Q: OEM vs. Aftermarket?

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: 99893341358

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Joe Rak
Massapequa, US
★★★★★ 4
Excellent Hard Sci-Fi… Until the Politics Pull You Out
Format: Kindle
I was really excited to dive into Project Hail Mary. As a longtime Isaac Asimov fan, I’ve been craving fresh, modern hard science fiction that actually respects the science. This book delivered — at least for a while. The author injects real science into the story in a way that’s both fun and fantastic. You don’t need to be an engineer to follow it; a solid high-school education is plenty. The concepts stretch your imagination without ever feeling impossible, and for the first chunk of the book I was hooked. I genuinely thought I’d found a new favorite author. Then the jarring interruptions started. Out of nowhere you get yanked out of the immersive sci-fi world by modern political pandering that feels completely unnecessary. A random parenthetical about Columbus “discovering an already inhabited world” when comparing something to the New World. Casual pronoun lectures. Characters selected or described by race and identity in ways that scream “check the boxes.” These moments don’t serve the story — they feel injected. Once you notice the author’s leanings, it becomes hard to unsee. Each time it happens, the fantasy evaporates. It takes several chapters to sink back into the story… only for the next micro-lecture to pull you right back out. Overall, I loved the writing, the hard science, and the imagination. It’s some of the best sci-fi I’ve read in years. I just wish the author had trusted the story instead of sneaking in real-world politics. It’s like eating the best meal of your life… and then finding a hair or two in it. Strongly recommended for the sci-fi, with the above caveat.
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Reviewed in the United States on May 17, 2026
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psusanh
Lake Worth, US
★★★★★ 5
Engrossing and Thought-Provoking
Format: Hardcover
This is an absolutely engrossing read in the first half of the book, especially--so much so that I actually canceled a social plan so that I could keep reading. The author shifts effortlessly across scenes and time--the play of past and present is very much part of the book's plot and insight--and I developed a fast curiosity and unsettling investment in understanding our anti-heroine/heroine Natalie. This surprised me, because had a friend not recommended the novel I never would have signed on to spend time in the head of a "tradwife." For me the novel was an imagined and imaginative provocation on American womanhood (and masculinity) in the 21st century, where no options or "performances" seem entirely satisfying or even real. I found it simultaneously disturbing and darkly humorous, especially in its depiction of young women's collegiate lives. However, readers should have some tolerance for caricature throughout. While I howled at the depictions of the miserable lives of aspiring "modern" women in the dorms and figuratively pounded my fists at the hypocrisy of the tradwife, I was also conscious of hyperbole and exaggeration--no, their lives aren't that bad; nor, I would guess, are the "tradwives" as bad as Natalie, who is a profoundly unlikable character. I did find that the novel bogged down in its middle and late-middle chapters--the mystery of what's happening to Natalie remains but the momentum seems to stall out into repetition. I also felt that the ending seemed too rushed and too tidy, given the nuance we see earlier in the novel. It ends with what feels like a reductive endorsement of modern (or post-modern) life for women when, earlier in the novel, we get to contemplate the flaws in ALL of the scripts and performances that women--and the hapless Caleb-- are asked to live by, or choose... Indeed, the characters that I would have loved to hear more from are the two who seemed more grounded and, ultimately, perhaps happier than the others: Natalie's sister and even her mother... The concluding exposition felt rushed, as did the analysis, in other words...Some of the religious scenes seemed tone-deaf to me... I'm not an evangelical, but Natalie's relationship to God strained credulity. **Highly recommend** this to anyone looking for a provocative and engrossing read on women's lives and constraints in the age of social media that engages in a fascinating thought experiment along the way...
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Reviewed in the United States on May 26, 2026
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Minifan
Grantham, US
★★★★★ 4
An unexpected reading experience!
Format: Hardcover
Very unexpected novel! I went into it without any knowledge or prior information of what it was going to be about. Main character is not a person you would want to be friends. So when calamities happen to her it was hard for me to muster up much sympathy or compassion. It was more of “you had this coming, you deserve every miserable minute”. And boy, there were many! Some harder to believe than others. As I was reading, I first thought- I don’t want to keep this book, it’s not worth saving. But it developed to be definitely the type of story that sticks in your mind, you find yourself revisiting parts and characters and wondering why that happened and why did that person react a certain way. And to me that’s a book worth reading and keeping on my limited bookshelf. So I changed my opinion as I read to the end of the novel. It is certainly a book worthy of a neighborhood book group discussion. I am recommending and sharing my copy to family members and reading friends.
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Reviewed in the United States on May 20, 2026
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Cheryl R💎
Charlottesville, US
★★★★★ 5
Beneath the perfect surface
Format: Kindle
Yesteryear completely caught me off guard in the best possible way. What begins as a fascinating look into social media influence, curated perfection, and historical living slowly unfolds into something far deeper and far more emotional than I expected. The storytelling was incredibly well done, especially the way the author balanced the polished modern influencer world against the harsh realities of 1800s frontier life. The transitions between timelines and perspectives were seamless, and by the end, every piece fit together in a way that completely redefined the story. What made this especially compelling for me was how layered Natalie’s character felt. Her upbringing, family expectations, faith, public image, and the pressure to maintain perfection all shaped the choices she made throughout the story. Rather than feeling one-dimensional, she felt like someone slowly buckling under the weight of everything she believed she was supposed to be. The emotional impact of this book surprised me. Beneath the historical elements and social media commentary is a story about identity, appearances, family, and the toll that constant performance can take on a person and those around them. This is one of those books where the less you know going in, the better the experience will be. I expected an entertaining premise, but I ended up with a story that lingered long after I finished the final page.
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Reviewed in the United States on May 28, 2026
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Lornwal
Cuba, US
★★★★★ 3
About that twist…
Format: Kindle
SPOILER ALERT! The thing about big, improbable twists in stories is that the less time you have to think about them, the better their effect. For fans of the classic TV show The Twilight Zone, it has always been clear that the half-hour shows were far better and far more punchy and memorable than their rather sad hour-long cousins. And a book has far, far more time to contemplate a twist than a TV show. Unfortunately, despite some pointed observations by the author (narcissistic people are pretty much unlikable, cruelty and brutality give power to weak men, abused children very often cling to their abusers), the big, improbable twist in Yesteryear almost completely sinks the story. The twist is the same one that sank M. Night Shyamalan’s 2004 movie The Village, and it fares no better here. Yes, people can and do live off the grid. But avoiding every single sign of civilization for years on end? Even if you’re not in a commercial flight path, there are such things as helicopters and small private planes, especially in remote areas. Perhaps people rarely stray onto private land in the wilderness, but once in a while, stray they do. And when that wilderness home was once widely publicized? Excuse me, but people are going to look for it. This is all not to say that Yesteryear was not entertaining - it was. I read it in one sitting. The characters, as unlikable and unreliable as they are, were well drawn. A couple of the children were also quite believable, but the author’s excuse for the rest of the kids being cyphers was that their mother saw them as cyphers as well. Okay, that’s fair, but knowing them better would have enhanced the story for the reader. This is certainly a promising book. It held my attention and was very well-written. But that twist - well, it sank M. Night Shyamalan, too.
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Reviewed in the United States on April 10, 2026

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