SKU: 5378978664

8M0057716 Gearcase Seal Kit for Mercury 135HP 150HP EFI | JLM Marine

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Description

8M0057716 Gearcase Seal Kit for Mercury 135HP 150HP EFI | JLM Marine8M0057716 Gearcase Seal Kit for Mercury 135HP 150HP EFI JLM Marine This gearcase seal kit is engineered to fit Mercury 135HP and 150HP EFI outboard engines, providing comprehensive sealing components for the gear housing and driveshaft assembly. Designed for both standard and counter rotation applications, this kit ensures reliable performance across multiple Mercury models and serial number ranges. This aftermarket replacement directly cross

8M0057716 Gearcase Seal Kit for Mercury 135HP 150HP EFI | JLM Marine

This gearcase seal kit is engineered to fit Mercury 135HP and 150HP EFI outboard engines, providing comprehensive sealing components for the gear housing and driveshaft assembly. Designed for both standard and counter rotation applications, this kit ensures reliable performance across multiple Mercury models and serial number ranges.

This aftermarket replacement directly cross-references to OEM part number 8M0057716, offering a cost-effective solution for maintaining your lower unit's integrity and preventing water intrusion.

  • Complete seal kit for Mercury EFI gearcase assemblies
  • Fits both standard and counter rotation configurations
  • Suitable for gear housing and driveshaft maintenance

Part Number Cross-Reference

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

Brand Part Number
Mercury 8M0057716

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 Serial Number Range Component Notes
Mercury 135HP EFI 135HP 2B131942 & Up Gear Housing, Driveshaft Standard/Counter Rotation
Mercury 150HP EFI 150HP 1B905505 & Up Gear Housing, Driveshaft Standard/Counter Rotation
Mercury 150HP EFI Sea Pro 150HP 2B139139 & Up Gear Housing, Driveshaft Standard/Counter Rotation

Technical Specifications

Specification Value
OEM Part Number 8M0057716
Application Gearcase Seal Kit
Compatible Brand Mercury
Compatible Models 135HP EFI, 150HP EFI, 150HP EFI Sea Pro
Configuration Standard and Counter Rotation
Component Coverage Gear Housing, Driveshaft

Package Contents

This gearcase seal kit includes all necessary sealing components required for servicing the gear housing and driveshaft assembly on compatible Mercury EFI outboards.

Installation Guide

  1. Preparation: Disconnect the battery and remove the lower unit from the outboard motor following your service manual's instructions.
  2. Disassembly: Drain the gear oil completely and remove the propeller shaft assembly. Carefully extract the driveshaft and note the orientation of all components.
  3. Seal Removal: Remove all old seals, O-rings, and gaskets from the gear housing and driveshaft using appropriate seal removal tools. Clean all sealing surfaces thoroughly with solvent and inspect for damage.
  4. Surface Preparation: Ensure all mating surfaces are free of debris, corrosion, and old seal material. Use a plastic scraper to avoid damaging aluminum surfaces.
  5. New Seal Installation: Lubricate new seals with marine-grade grease before installation. Install seals carefully using the appropriate driver or socket to avoid cocking or damage.
  6. Reassembly: Reinstall the driveshaft, propeller shaft, and all components in reverse order. Torque all fasteners to manufacturer specifications.
  7. Refill & Test: Refill the lower unit with the correct grade and quantity of gear oil. Reinstall the lower unit, check for leaks, and perform a water test to verify proper operation.

Troubleshooting & FAQ

Q: How do I confirm this seal kit fits my Mercury outboard?
A: Verify your engine's serial number against the compatibility table above. Mercury 135HP and 150HP EFI models with serial numbers 2B131942 & up (135HP), 1B905505 & up (150HP), and 2B139139 & up (150HP Sea Pro) are compatible. Cross-check with your parts diagram to ensure the component matches.

Q: How often should I replace the gearcase seals?
A: Replace gearcase seals whenever the lower unit is disassembled for service, or immediately if you notice milky gear oil (indicating water intrusion), oil leaks around the propeller shaft, or loss of gear oil level. Regular inspection during seasonal maintenance is recommended.

Q: What tools do I need to install this seal kit?
A: You'll need seal drivers or appropriately sized sockets, a seal puller or pick set, torque wrench, gear oil pump, marine-grade grease, and basic hand tools. A service manual for your specific model is highly recommended for torque specifications and assembly sequences.

Q: Can I use this kit on both standard and counter rotation lower units?
A: Yes, this seal kit is designed for both standard and counter rotation configurations on the compatible Mercury EFI models listed. The sealing components are identical for both rotation types.

Q: What are signs of failing gearcase seals?
A: Common symptoms include milky or contaminated gear oil, visible oil leaks near the propeller or driveshaft, loss of gear oil between services, overheating of the lower unit, or unusual noise during operation. Address these issues immediately to prevent bearing and gear damage.

Q: Is this an OEM part or 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: 5378978664

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A regular Joe
Cuba, US
★★★★★ 5
Nice Filter Wrench for my Volvo V70XC!
Size: 86mm x 16
I was needing a filter wrench for my 2001 Volvo V70XC and couldn't find anything that fit from the local auto parts stores. Not knowing what to expect, I took a chance on this one since most of the reviews were 5 star and the price was exceptional. When I received it, I was quite pleased with the construction and finish. I have a brand new oil filter housing for my Volvo (since the one currently on my car is chewed up from the former owner using slip-jaw pliers or something on it) and the fit is perfect! I have worked as a mechanic my whole life (aircraft & automotive), and spent a couple of years as a technician at an automotive dealership and I can say that the tool looks like it is designed for heavy-duty use. The stamped steel housing is thicker than those found in local auto parts stores and the drive adapter has a thick arc welded bead along the inside of the tool. So, it appears to be made to hold up to some fairly heavy torque. Although the product description states that it is 1/2", the drive adapter is actually made for direct attachment to a 3/8" drive. Perhaps this error stems from the fact that they offer a much larger wrench (118-131mm) and this is a more accurate description of their other offerings. The 3/8" drive adapter works perfectly and a 21mm socket fits nicely on the external hex. Fits with SAE sizes are a mixed bag, though. I was able to attach a 13/16" 12-pt. box-end wrench, but not the opposing open-end. A similarly sized 13/16" 6-pt. socket was extremely tight, so I wouldn't recommend this size and would just go with the 21mm if you had to use the external hex. Otherwise, just use the 3/8" drive adapter for easiest use of this tool. The adapter also incorporates ball detents on all four sides of the internal 3/8" drive, so your ratchet or extension won't easily fall off while in use. Since this tool is made for oil filter removal & installation, I'm sure that it will deliver as promised. I'll post an update after my next oil change and I get a chance to use it and install the new filter housing I have.
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Reviewed in the United States on January 25, 2014
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Charles Szatkowski
Massapequa, US
★★★★★ 5
Makes the job easy
Size: 88.5mm x 16
Worked well for removing and installing the oil filter housing.
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Reviewed in the United States on April 17, 2026
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Lynn Carbin
Waukegan, US
★★★★★ 5
Great tool
Size: 88.5mm x 16
Fit perfectly. Great tool. Made changing oil fast and easy .
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Reviewed in the United States on November 28, 2025
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Humble Servant
Chelsea, US
★★★★★ 4
very good tool fits PL14006 just right
Size: 76mm x 14
This fit my PL14006 oil filter.
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Reviewed in the United States on February 7, 2026
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Person of Knowledge
San Leandro, US
★★★★★ 5
The Perfect Tool - Life is Short So Just Buy It.
Size: 88mm x 15
So. Life is too short to struggle with little demons and other inconveniences. I change oil in all my cars, trucks, and SUVs. One of my cars is a V6 Hyundai and the filter cartridge is inside a housing that is sometimes more than a tad inconvenient to loosen and screw back in place. My regular filter removal tools including strap style as well as a three arm gripper type just did not perform very well. I saw this thing, ordered it, and man...it is perfect. The metal top allows a wrench ( spanner) or a socket wrench to be used. I have a fancy Snapon torque wrench which I can also use just to be fancy. In any case removing and re-securing the filter housing on the Hyundai V6 is now a breeze. The cap wrench itself is solid and very well constructed Five stars and count me in as impressed. Well done CTA Tools !!!
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Reviewed in the United States on February 6, 2026

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