SKU: 5378978664

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

Sale price$42.30 Regular price$47.00
Save 10%

Pay in installments of $11.75 with ShopPay, AfterPay and Klarna

Shipping Estimate
USA
  • USA
  • CAN

Ships within 48 hours · Estimated delivery Jul 27 - Aug 1

Promo Codes Available:

For Your Every Summer RSVP, with Code: SUMMER15

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

Discover Niche Categories That Outsell

Top-Converting Item to Boost Your Average Order

4.7 ★★★★★
Based on 8 reviews
Sort
Highest Rating
Newest First
Oldest First
Product Reviews
S
Verified Purchase
Sebastian
Alexandria, US
★★★★★ 5
Strong hold
Color: Multi-colored, Color: Multi-colored
Very good product. I’m definitely impressed. I have two German shepherds and this toy is definitely durable and does what it’s made to do. The suction is great. The company even gives you a clear plastic strip that you can actually put on the floor and then put the suction cup on it For better grip. I’ve had suction toys before which was absolutely horrible. This one definitely supersedes all others. The suction comes off once in a while but usually that’s because if my dogs are literally biting on the suction cup part lol. But with confidence. Great product
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 23, 2024
K
Verified Purchase
Kristina
Port Orchard, US
★★★★★ 5
Absolutely recommend for active dogs or puppies
Color: Multi-colored
Absolutely recommend! I have a 10 month old puppy and he has been obsessed with this since the day I bought it a few months ago.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 17, 2026
J
Verified Purchase
Jean
Los Angeles, US
★★★★★ 4
Base of you is very durable
Color: Blue
Overall this is a fun toy. My German Shepherd loves it. The ropes were chewed off within the first hour which was disappointing. Using it for treats did not work because the opening is so large. It has become only a chew toy and it is very durable. Since I bought this to enjoy the extra features, I am disappointed. I was able to buy three chew only toys for the same price. I still give it four stars because my dog likes it so much.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 15, 2023
T
Verified Purchase
Terri Bodker
Whiting, US
★★★★★ 1
The dog will destroy the ropes and eat them be careful with this
Color: Blue
The rubber part is very durable but the strings or ropes are not. Puppy is eating the strings and having a hard time pooping them out. Just cut them off close to the knots and watch for them to eat the strings they pull off.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 12, 2022
L
Verified Purchase
lildevil35
Boise, US
★★★★★ 3
Is not as durable as they say for large dogs
Color: Multi-colored
My dog loved the fact he got a new toy and he loved the toy itself. Carrying it around and shaking it, that is. The ropes are small and pop right back out of the ball. They are more for a small dog to tug on. The suction is strong but still not strong enough for a 100 lbs Rotti. He kept grabbing the eleasic ropes and pulling off the floor.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 20, 2023

recommand products