SKU: 27463330434

8M0088081 Gearcase Seal Kit for Mercury 65HP EFI JET 75HP EFI 75HP EFI Sea Pro 80HP EFI 80HP EFI JET 90HP EFI 90HP EFI Sea Pro 100HP EFI 115HP EFI 115HP EFI Sea Pro 115HP EFI Pro XS | JLM Marine

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Description

8M0088081 Gearcase Seal Kit for Mercury 65HP EFI JET 75HP EFI 75HP EFI Sea Pro 80HP EFI 80HP EFI JET 90HP EFI 90HP EFI Sea Pro 100HP EFI 115HP EFI 115HP EFI Sea Pro 115HP EFI Pro XS | JLM MarineGearcase Seal Kit Fits Mercury 65HP115HP EFI Outboards (OEM 8M0088081) This gearcase seal kit is engineered for Mercury EFI outboards ranging from 65HP to 115HP, including standard, Sea Pro, Pro XS, and JET models. Designed to service both driveshaft and propeller shaft housings with 2. 38: 1 gear ratios, it ensures reliable sealing and protection for your lower unit. Direct replacement for Mercury OEM part number 8M0088081. Compatible with serial

Gearcase Seal Kit – Fits Mercury 65HP–115HP EFI Outboards (OEM 8M0088081)

This gearcase seal kit is engineered for Mercury EFI outboards ranging from 65HP to 115HP, including standard, Sea Pro, Pro XS, and JET models. Designed to service both driveshaft and propeller shaft housings with 2.38:1 gear ratios, it ensures reliable sealing and protection for your lower unit.

Direct replacement for Mercury OEM part number 8M0088081. Compatible with serial numbers 2B095049 & Up for most models and 2B225488 & Up for 115HP EFI Pro XS engines.

  • Fits both standard and counter rotation gearcases
  • Suitable for gear housing, driveshaft, and propeller shaft sealing
  • Covers Mercury EFI outboards: 65HP JET, 75HP, 80HP, 90HP, 100HP, and 115HP models

Part Number Cross-Reference

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

Brand Part Number
Mercury 8M0088081

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 Serial Number Component Gear Ratio / Rotation
Mercury Outboard 115HP EFI Pro XS 2B225488 & Up Gear Housing, Driveshaft 2.38:1 Standard Rotation
Mercury Outboard 90HP EFI 2B095049 & Up Gear Housing, Driveshaft 2.38:1 Standard/Counter Rotation
Mercury Outboard 100HP EFI 2B095049 & Up Gear Housing, Driveshaft 2.38:1 Standard/Counter Rotation
Mercury Outboard 75HP EFI Sea Pro 2B095049 & Up Gear Housing, Driveshaft 2.38:1 Standard/Counter Rotation
Mercury Outboard 65HP EFI JET 2B095049 & Up Gear Housing, Driveshaft 2.38:1 Standard/Counter Rotation
Mercury Outboard 80HP EFI 2B095049 & Up Gear Housing, Driveshaft 2.38:1 Standard/Counter Rotation
Mercury Outboard 90HP EFI Sea Pro 2B095049 & Up Gear Housing, Driveshaft 2.38:1 Standard/Counter Rotation
Mercury Outboard 80HP EFI JET 2B095049 & Up Gear Housing, Driveshaft 2.38:1 Standard/Counter Rotation
Mercury Outboard 115HP EFI Sea Pro 2B095049 & Up Gear Housing, Driveshaft 2.38:1 Standard/Counter Rotation
Mercury Outboard 115HP EFI 2B095049 & Up Gear Housing, Driveshaft 2.38:1 Standard/Counter Rotation
Mercury Outboard 75HP EFI 2B095049 & Up Gear Housing, Driveshaft 2.38:1 Standard/Counter Rotation
Mercury Outboard 100HP EFI 2B095049 & Up Gear Housing, Propeller Shaft 2.38:1 Standard Rotation
Mercury Outboard 75HP EFI Sea Pro 2B095049 & Up Gear Housing, Propeller Shaft 2.38:1 Standard Rotation
Mercury Outboard 90HP EFI 2B095049 & Up Gear Housing, Propeller Shaft 2.38:1 Standard Rotation
Mercury Outboard 65HP EFI JET 2B095049 & Up Gear Housing, Propeller Shaft 2.38:1 Standard Rotation
Mercury Outboard 80HP EFI 2B095049 & Up Gear Housing, Propeller Shaft 2.38:1 Standard Rotation
Mercury Outboard 115HP EFI Pro XS 2B225488 & Up Gear Housing, Propeller Shaft 2.38:1 Standard Rotation
Mercury Outboard 80HP EFI JET 2B095049 & Up Gear Housing, Propeller Shaft 2.38:1 Standard Rotation
Mercury Outboard 115HP EFI Sea Pro 2B095049 & Up Gear Housing, Propeller Shaft 2.38:1 Standard Rotation
Mercury Outboard 90HP EFI Sea Pro 2B095049 & Up Gear Housing, Propeller Shaft 2.38:1 Standard Rotation
Mercury Outboard 115HP EFI 2B095049 & Up Gear Housing, Propeller Shaft 2.38:1 Standard Rotation
Mercury Outboard 75HP EFI 2B095049 & Up Gear Housing, Propeller Shaft 2.38:1 Standard Rotation

Technical Specifications

Specification Value
OEM Part Number 8M0088081
Application Gearcase sealing (driveshaft & propeller shaft)
Gear Ratio 2.38:1
Rotation Type Standard / Counter Rotation

Package Contents

This kit includes all seals required for servicing the gearcase assembly on compatible Mercury EFI outboards.

Installation Guide

  1. Disconnect the battery and remove the propeller. Drain all lower unit oil completely before beginning disassembly.
  2. Remove the lower unit from the outboard following your service manual's instructions. Clean all mating surfaces thoroughly.
  3. Carefully remove old seals from the driveshaft and propeller shaft housings using appropriate seal removal tools. Inspect shafts for scoring or damage.
  4. Clean seal grooves and apply a thin coat of marine-grade grease to new seals before installation.
  5. Install new driveshaft seals using a proper seal driver, ensuring they are seated evenly and fully into their housings.
  6. Install propeller shaft seals in the same manner, taking care not to damage seal lips during installation.
  7. Reassemble the lower unit, ensuring all O-rings and gaskets are properly positioned. Torque all fasteners to factory specifications.
  8. Refill the lower unit with the correct type and quantity of gear oil. Check for leaks before reinstalling the propeller and reconnecting the battery.

Troubleshooting & FAQ

Q: How do I confirm this seal kit fits my Mercury outboard?
A: Verify your engine's model, horsepower, and serial number against the compatibility table above. For 115HP Pro XS models, ensure your serial is 2B225488 or higher; for all other listed models, 2B095049 or higher. You can also cross-reference part number 8M0088081 in your engine's parts diagram.

Q: How often should I replace my gearcase seals?
A: Replace seals whenever you notice lower unit oil contamination (milky appearance), leaks around the gearcase, or during major lower unit service. Inspect seals annually if you operate in harsh saltwater or high-hour conditions.

Q: What are common signs of failing gearcase seals?
A: Watch for gear oil leaking from the lower unit, water mixing with gear oil (indicated by a milky color), decreased performance, or unusual noise from the lower unit. Address seal failure immediately to prevent bearing and gear damage.

Q: Can I install this kit myself or do I need a professional?
A: Installation requires lower unit disassembly, seal removal tools, and torque specifications. If you have mechanical experience and the proper tools, you can install it yourself following your service manual. Otherwise, professional installation is recommended to ensure proper sealing and avoid costly damage.

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: 27463330434

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4.5 ★★★★★
Based on 23 reviews
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Product Reviews
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Verified Purchase
L C
Grantham, US
★★★★★ 5
Will not be disappointed
Color: Black/Blue
Keeping in mind that I received this item yesterday (2/24/16), I absolutely love this watch. The reason I have so much confidence with this watch is because I've owned one other Timex similar to this one, and it served me extremely well and is still able to do so. First off, this watch is certainly aesthetically pleasing. The blue color around the face of the watch and outline in the band, goes really well with the black frame. It's just an overall nice looking watch. More importantly, the quality seems great. As I mentioned, I've owned a Timex expedition, which I've had for more than 2 years, and it's still working perfectly fine. The watch seems like it's put together very well and there's no loose or flimsy parts. One complaint that many people seem to have with Timex is the quality of their band. Unfortunately I'd have to agree, since the band on my other Timex that's still working like the first day I got it, cracked and broke and is only being held together by the nylon fabric on the other side of the band. You're not going to have that problem with this watch. It's a full nylon band with Velcro adjustment, for precise fitting. it feels extremely comfortable and you won't need to worry about the band cracking (although I'm sure there will be certain defects in a mass produced bunch). I will use this watch for work and running, and rarely plan on taking it off. Just to give you an idea, I also have a garmin gps watch that I love and obviously has more functions than this watch. However, the second I received this watch, I slapped it on and put my garmin to the side. This watch also looks amazing when you wear it. I'll update this feedback as needed, but I'm confident this watch will serve me for years to come, just as my other one has.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 25, 2016
T
Verified Purchase
TheGenuineBeavis
San Leandro, US
★★★★★ 5
Greatest watch I've ever had, but changing batteries is near impossible
Color: Black/Blue
This is the 3rd time I've bought this watch. Same brand, same or very similar model. It has a chronometer, timer, alarm, and of course the clock. It has something I think is for "occasions" but I don't know what it does and don't really care about it. The watch is durable. It uses battery power efficiently. The indiglo is second to none. I just really really like this watch. Having said all that, if you want to change the batteries, good luck, you'll need it. Once you manage to get the backing off of it and open it up (which is a little tricky in itself), it's like a comedy routine where you see some stooge open an electrical device and a buncha parts and springs go flying everywhere. And of course, they are so tiny, you'll never find them once they fly out. That was the exact scenario I found myself in the last time I tried to change the battery. It made me so mad I actually bought another brand of watch that I thoroughly researched. But that watch DIDN'T use battery power efficiently, and it had a host of other minor problems that added up to the conclusion that it was not nearly as great as this Timex. So, for the 3rd time, I found myself buying this Timex watch. So it's a wonderful watch in every way except longevity because changing the batteries has historically been a nightmare for me.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 4, 2019
S
Verified Purchase
Sand Man
Massapequa, US
★★★★★ 5
A better Ironman design
Color: Black/Blue
I've been a fan of Timex watches for most of my life, paying about $30 for one in the 1960s, and that hasn't changed at all in 2010 because I'm still paying about $30 for my Timex watches. It is a rare case indeed when the quality of a product continually improves over several decades while the price remains the same. And as John Cameron Swayze would say in those live ads during the early years of TV, "Timex takes a lickin and keeps on tickin". The MEGA deserves a good review after I have been using it for a while. You might also see it advertized as the "Oversize" because most distinctive about this design is its size, so tagging it with the name MEGA is entirely justified. It is massive in comparison to most of the other Ironman series of watches, and what seemed at first to be just another unnecessary Ironman 30 Lap design has turned out to be one of my favorites for all-around wearing. This new design keeps the clockworks of the standard size 30 Lap Ironman watches, it counts up and down, programs the same, has several alarms, and of course, it has the Indigo night light that works so well. This is one of five different versions of the Mega available in the USA, and the only one with a Fastwrap Velcro wristband with blue striping and a matching blue bezel. Velcro wristbands are a favorite among many athletes and when it wears out, it can be replaced with either an identical factory band or one that is made of urethane rubber. Overall, the Mega is a good choice for runners in need of a new 30 lap Ironman who can appreciate having a watch that is distinctively larger and what I would consider to be much better in appearances over the others of standard or mid size Ironman dimensions.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 17, 2010
T
Verified Purchase
Thomas T Sloan, jr
Lexington, US
★★★★★ 5
Love it
Color: Black/Blue
Have worn these watches for years.they are durable they can get wet take a beating but they keep on ticking. I’m just not a fan of watches you have to charge all the time
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Reviewed in the United States on May 11, 2026
P
Verified Purchase
@photobrow
Phoenix, US
★★★★★ 5
Compared to g-shock?
Color: Black/Yellow
Firstly random public reviews can be comical…”it’s has a battery, terrible, One star” or “I don’t like yellow, one star” omg peoples do better. I’ll review this while comparing to an older style of g-shock from the same era. I’ll start by saying this timex rocks, for me in my mid 50’s it’s so retro and nastalgic, brings back memories, I may have even owned this model back in the day. What’s great about it- the display, larger digits than the typical g-shock and they are super crisp, clear and easy to read. The indiglo is awesome. This is the most accurate quartz watch I have aside from the atomic g-shocks that adjust themselves daily. I prefer a chunky watch and the g-shocks do a better job in that department. i feel this watch is rugged, but I’d still give the nod to g-shock in this department. 200M water resistance is the gold standard and this watch has it which I love for peace of mind for any water based activities. This is a 5 star watch at a great price. I still love some aspects of a g-shock better but its just preference.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 11, 2026

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