SKU: 46918730919

Lower Gearcase Seal Kit – Fits MerCruiser Alpha One Gen 2 Sterndrives (Replaces 26-816575A3, 26-816575A1)

Sale price$31.49 Regular price$34.99
Save 10%

Pay in installments of $8.75 with ShopPay, AfterPay and Klarna

Shipping Estimate
USA
  • USA
  • CAN

Ships within 48 hours · Estimated delivery Aug 24 - Aug 29

Promo Codes Available:

For Your Every Summer RSVP, with Code: SUMMER15

Description

Lower Gearcase Seal Kit – Fits MerCruiser Alpha One Gen 2 Sterndrives (Replaces 26-816575A3, 26-816575A1)Lower Gearcase Seal Kit Fits MerCruiser Alpha One Gen 2 Sterndrives (Replaces 26 816575A3, 26 816575A1) This lower gearcase seal kit is designed for MerCruiser Alpha One Gen 2 sterndrives (1991present) with serial numbers 0D469859 and later. It provides a comprehensive solution for servicing and resealing the lower drive unit to prevent water intrusion and oil leaks. This kit serves as a direct replacement for MerCruiser OEM part numbers 26 816575A3

Lower Gearcase Seal Kit – Fits MerCruiser Alpha One Gen 2 Sterndrives (Replaces 26-816575A3, 26-816575A1)

This lower gearcase seal kit is designed for MerCruiser Alpha One Gen 2 sterndrives (1991–present) with serial numbers 0D469859 and later. It provides a comprehensive solution for servicing and resealing the lower drive unit to prevent water intrusion and oil leaks.

This kit serves as a direct replacement for MerCruiser OEM part numbers 26-816575A3 and 26-816575A1. It also cross-references with Sierra 18-2646-1, GLM 87511, and Mallory 9-74206.

  • Engineered as a direct replacement for a perfect fit and reliable function.
  • Prevents water from entering and oil from leaking out of the gearcase.
  • Includes all the necessary gaskets, seals, and O-rings for a complete lower unit service.

Part Number Cross-Reference

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

Brand Part Number
MerCruiser 26-816575A3
MerCruiser 26-816575A1
Sierra 18-2646-1
GLM 87511
Mallory 9-74206

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 Alpha One Gen 2 Sterndrives Various 4-Stroke 1991–present 26-816575A3, 26-816575A1 Fits serial # 0D469859 and later

Technical Specifications

Specification Value
Product Type Lower Gearcase Seal Kit
Installation Direct replacement
Dimensions As per OEM specifications
Warranty Varies by manufacturer (typically 1 year)
Other Technical Attributes Prevents leakage of the gearcase; ensures normal operation of drive unit

Package Contents

  • 1 x Carrier Seal (821759A2)
  • 1 x Impeller Gasket (27-43033-1)
  • 1 x Seal Ring (26-45577)
  • 1 x Impeller Gasket (27-817277)
  • 1 x Oil Seal (26-8164641)
  • 1 x Oil Seal (26-12224)
  • 1 x Face Seal (8M2014338)
  • 2 x Drain Screw Gasket (26-830749)
  • Various O-Rings

Installation Guide

  1. Position the sterndrive in the full-down position and place a drain pan under the lower unit. Remove the upper and lower drain/fill screws and drain the gear lube completely.
  2. Remove the propeller assembly.
  3. Unbolt and carefully separate the lower gearcase unit from the upper housing. Be prepared to support its weight.
  4. With the lower unit on a workbench, remove the water pump housing and impeller assembly to access the upper seals.
  5. Remove the bearing carrier to access the propeller shaft seals. This may require a specialized puller tool.
  6. Carefully remove all old seals, O-rings, and gaskets from the housing, driveshaft, and bearing carrier. Clean all sealing surfaces thoroughly, removing any old sealant or corrosion.
  7. Install the new seals and O-rings into their respective locations. Ensure seals are seated correctly and facing the proper direction to prevent leaks.
  8. Reinstall the bearing carrier and water pump assembly, using the new gaskets provided in the kit.
  9. Reattach the lower gearcase unit to the upper housing, ensuring the driveshaft, shift shaft, and water tube align correctly. Torque bolts to manufacturer specifications.
  10. Reinstall the propeller.
  11. Refill the gearcase with new, high-quality marine gear lube through the bottom hole until it flows from the top hole. Reinstall the vent and fill screw gaskets and screws.

Troubleshooting & FAQ

How do I confirm this kit fits my engine?
This kit is specifically for MerCruiser Alpha One Gen 2 sterndrives manufactured from 1991 to the present. The most important check is your serial number; it must be 0D469859 or later. Do not use this kit if your drive is a Gen 1 or has a lower serial number.

What are the signs my gearcase seals are failing?
The most common sign is milky, light-colored gear lube, which indicates water has mixed with the oil. You may also notice gear oil leaking from the propeller shaft area or from the drain screw seals.

How often should I replace the lower unit seals?
It is recommended to inspect your gear lube for water after every season. Seals should be replaced as part of regular maintenance every few years, or immediately if you detect a leak or water intrusion. Many technicians replace the water pump impeller and lower unit seals at the same time.

OEM vs. Aftermarket?
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.

How fast do you ship and how much does it cost?
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.

What is your warranty and return policy?
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: 46918730919

Discover Niche Categories That Outsell

Top-Converting Item to Boost Your Average Order

4.7 ★★★★★
Based on 13 reviews
Sort
Highest Rating
Newest First
Oldest First
Product Reviews
J
Verified Purchase
Jaime Colombani
Grantham, US
★★★★★ 5
Good product, needs double hinges for versatility.
Size: 6 Panel, Color: Brown
Blocks out all the light, looks good, good color. Only con is that it is not double hinged so it is hard to position the extra panels because I bout 6 panels instead of the 4 I usually get. Good deal, very decent price with the free delivery. Very clean packaging, came in great shape, no smell or odor from the factory.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on September 9, 2025
A
Verified Purchase
Anne
Lake Worth, US
★★★★★ 5
Very Pleased with Room Divider
Size: 4 Panel, Color: Brown
This room divider is even better than I expected. It's sturdy but is lightweight enough that I could get the box up a flight of stairs with no problem whatsoever. It folds and unfolds easily and is very easy to move. And there's no assembly required! It really is woven and is quite attractive. The main reason I chose this item was price (although I did like the way it looked) and I got more for my money than I thought I would.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 13, 2025
T
Verified Purchase
The Maschmo
Lexington, US
★★★★★ 5
Works well
Size: 4 Panel, Color: Coal Black
i bought this for 3 reasons. 1. Privacy when changing so I don't have to lock dog out of room. 2. In case MIL comes over and wants to snoop. She won't be able to see my bedroom. 3. A nice backdrop to use when taking photos of the clothing I make. This is perfect for me. My only "complaint" is that it is not the most sturdy thing. I have to finagle it in a way that keeps it from falling over. But for the price, it can't be beat!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 18, 2026
S
Verified Purchase
Sebastian Monte
Draper, US
★★★★★ 3
Cheap and unstable
Size: 4 Panel, Color: Black, Size: 4 Panel, Color: Black
Although this has nothing to do with the product, it arrived a day later than previously stated. Making me have to create a makeshift room divider the day it was actually needed. When the product arrived it arrived in a box that showed no evidence of damage. Once opened, divider was found inside a plastic cover. Great protector for dust or scratching. The divider was fully assembled so there was nothing for me to do but remove it from packaging and use it where needed. After further inspection the divider was not only cheap and flimsy looking it was absolutely unstable. It would wobble and appears to have been assembled in a rush making some panels crooked. I noted significant damage to the bottom portion of some of the panels both front and back. It does not feel like an item worth the price. The color is as advertised and the product had no smell. The sizing was accurate.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 17, 2025
D
Verified Purchase
D
Houston, US
★★★★★ 5
Quality Product Easy to Use Awesome Privacy Great Price
Size: 4 Panel, Color: Black
I have Purchased 2 of these Room Dividers. One for my Nephew and One for my Son. They Both Say they are Sturdy and easy to setup and use. The Quality and Price are Great! Easy to setup already assembled and Very well made. I would recommend this Product
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 1, 2025

recommand products