SKU: 30654898789

Lower Unit Seal Kit – Fits Johnson Evinrude 85-125 HP (Replaces 18-2691, GLM 87611, Mallory 9-74114)

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Description

Lower Unit Seal Kit – Fits Johnson Evinrude 85-125 HP (Replaces 18-2691, GLM 87611, Mallory 9-74114)Lower Unit Seal Kit Fits Johnson Evinrude 85 125 HP This lower unit gearcase seal kit is designed for Johnson Evinrude 85, 100, and 125 HP outboard models (19711972) equipped with a large prop shaft. It provides the necessary components to restore seal integrity and prevent water intrusion or oil leaks in the gearcase. This kit is a direct replacement for several OEM and aftermarket part numbers, including Sierra 18 2691, GLM 87611, and Mallory 9

Lower Unit Seal Kit – Fits Johnson Evinrude 85-125 HP

This lower unit gearcase seal kit is designed for Johnson/Evinrude 85, 100, and 125 HP outboard models (1971–1972) equipped with a large prop shaft. It provides the necessary components to restore seal integrity and prevent water intrusion or oil leaks in the gearcase.

This kit is a direct replacement for several OEM and aftermarket part numbers, including Sierra 18-2691, GLM 87611, and Mallory 9-74114.

  • Complete Kit: Includes all necessary oil seals, O-rings, and gaskets for a lower unit overhaul.
  • Direct Replacement: Engineered to match OEM specifications for a precise fit and reliable function.
  • Application: Specifically designed for select 1971–1972 Johnson/Evinrude outboard motors.

Part Number Cross-Reference

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

Brand Part Number
Sierra 18-2691
GLM 87611
Mallory 9-74114
QuickMarine 18-2691
UanofCn 18-2691

Compatible Engine Models

Confirm your engine model/year in the table below. For Johnson/Evinrude owners, here’s a guide to help you identify your engine’s serial/model: Johnson/Evinrude Serial Number Guide.

Brand Model Rated HP Prop Shaft Years OEM Part No.
Johnson/Evinrude Johnson/Evinrude 85 Large Prop Shaft 1971-1972 18-2691
Johnson/Evinrude Johnson/Evinrude 100 Large Prop Shaft 1971-1972 18-2691
Johnson/Evinrude Johnson/Evinrude 125 Large Prop Shaft 1971-1972 18-2691

Technical Specifications

Specification Value
Product Type Lower Unit Gearcase Seal Kit
Installation Direct replacement
Package Contents Oil seals, O-rings, Gaskets
Dimensions 150 × 100 × 30 mm (5.91 × 3.94 × 1.18 inches) [package dimensions]
Weight 0.08 kg (2.82 ounces)
Position Lower unit
Application Marine outboard motors
Warranty Manufacturer warranty (details vary by brand)

Package Contents

  • Oil Seals (Various sizes)
  • O-rings (Various sizes)
  • Gaskets (Various types)

Installation Guide

  1. Ensure the engine is off and securely positioned in a stand or on the vessel.
  2. Drain the gearcase oil completely by removing the drain and vent plugs.
  3. Remove the propeller assembly from the propshaft.
  4. Unbolt and carefully separate the entire gearcase (lower unit) from the outboard's midsection.
  5. Disassemble the lower unit to access the propeller shaft bearing housing, driveshaft, and shift shaft seals. Keep parts organized.
  6. Carefully remove all old seals, O-rings, and gaskets. Clean the component surfaces of any sealant, corrosion, or debris.
  7. Compare the new seals from the kit to the old parts to confirm correct sizing and placement.
  8. Lightly lubricate the new seals with marine grease before carefully pressing them into place. Ensure they are seated correctly.
  9. Install the new gaskets and O-rings during reassembly.
  10. Reassemble the lower unit, torquing all bolts to the manufacturer's specified values.
  11. Refill the gearcase with the correct grade and amount of fresh marine gear lube.
  12. Check for any leaks around the drain plugs, shafts, and seams before operating the engine under load.

Troubleshooting & FAQ

Q: How do I confirm this seal kit fits my Johnson/Evinrude engine?
A: This kit is specifically for 85-125 HP models from 1971-1972 with a large prop shaft. The best way to confirm fitment is to cross-reference your original part number with the ones listed, such as Sierra 18-2691, GLM 87611, or Mallory 9-74114.

Q: What are the signs that my lower unit seals are failing?
A: The most common symptoms are milky or water-contaminated gear oil (which looks like coffee with cream), visible oil leaks from the propeller shaft area, or a distinct burning smell coming from the gearcase after operation.

Q: How often should I replace the lower unit seals?
A: There is no fixed replacement interval. Seals should be replaced whenever the lower unit is serviced, if you notice any signs of leaks or water intrusion, or as a part of preventative maintenance on older engines.

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: 30654898789

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Lowell, US
★★★★★ 5
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Format: Kindle
There were so many great excerpts throughout the book that my highlights filled 16 pages in MS Word. This is a must read for all Pentagon personnel, those in operational commands, the acquisition community, and defense industry. Chris' insights as McCain's advisor were invaluable to understand the nuances and competing incentives of the DoD, industry, and Congressional perspectives. "The problem is that America is playing a losing game. Over many decades we have built our military around small numbers of large, expensive, exquisite, heavily manned, and hard to replace platforms that struggle to close the kill chain as one battle network. China, meanwhile, has built large numbers of multi million dollar weapons to find and attack America’s small numbers of exponentially more expensive military platforms." "It requires a sweeping redesign of the American military: from a military built around small numbers of large, expensive, exquisite, heavily manned, and hard to replace platforms to a military built around large numbers of smaller, lower cost, expendable, and highly autonomous machines." "New technologies alone will not save us. We need new thinking — an ambitious effort to reimagine the ends, ways, and means of US military power, as well as the role of our allies in this effort — to succeed in a future world where America’s military superiority will likely erode further if China’s military technological development continues."
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Reviewed in the United States on May 9, 2020
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Dick Martin
Los Angeles, US
★★★★★ 5
The Real Arms Race
Format: Kindle
I am a life-long Democrat, supposed to bristle at the very idea of military spending. Brose's book convinced me the problem is not how much we spend, but what we're spending it on. "Kill chain" is military-speak for the three phases of combat -- figuring out what's going on, deciding what to do about it, and taking effective action. Brose spells out how technology changed all three phases while the Defense Department and its minders in Congress weren't paying attention. The result has been to significantly undermine our military preparedness and, more importantly, the ultimate goal of deterrence. For all the money we're spending, Brose shows how it's mostly on the wrong things, i.e., large, expensive platforms that are only incremental improvements over prior systems designed for different times. He shows how the military-industrial complex, abetted by a Congress invested in the status quo, is arming our military with technology inferior to what you'd find in a modern automobile. The development of the Internet may have been kick-started by the defense department back in the 1960s, but the information revolution that followed largely left the U.S. military behind. Meanwhile, potential adversaries are compensating for relatively lower defense budgets by exploiting emerging technologies that could change the character of war, raising multiple ethical, geo-political, and governance issues. The Kill Chain is compelling, scary, and must-reading for our political leaders and all intelligent voters.
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Peter A. Scala
Chelsea, US
★★★★★ 5
Well written and thought-out approach to change DoD acquisition
Format: Hardcover
I'm a Navy acquisition manager and former Navy officer. I very strongly recommend this book as required reading for Pentagon (especially flag officers and SESs), congressional staffs, defense contractors and those who would be defense contractors, Silicon Valley companies, and everyone who cares about the future of the United States. The author expertly characterizes the current world situation and the issues with DoD acquisition practices. He is not brutal about it, but fair. He explains the background and history behind how we got to where we are, and identifies a path forward. I believe that following the approach recommended is very hard, but very worth while. The author worked for Senator McCain for almost ten years, and it is clear that this book benefits from his experience. My only gripe (and it is a minor one) is that very occasionally the author allows his feelings about Trump to manifest in a negative way. This is often justified, but it shouldn't be so one-sided. Nevertheless, this book is must-read, and deserves five stars.
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Reviewed in the United States on January 2, 2021
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Craig Hart
Carnegie, US
★★★★★ 4
Very Educational
Format: Paperback
I enjoyed the book. I wish the average American would take more of an interest in these kinds of issues facing the U S in the China sea region of the world.
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A sobering review of how to efficiently kill one another.
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