SKU: 46918730919

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

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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

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4.2 ★★★★★
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Reviewed in the United States on May 31, 2026
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Adarius Carr Prime
Carnegie, US
★★★★★ 5
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Reviewed in the United States on May 7, 2026
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Kimmi Bear
Bozeman, US
★★★★★ 3
This version is ok, but NOT for my boy-The 24in Jumbo version is the perfect toy for Kota-Ghost.
Style: White, Size: 24" Jumbo, Style: White, Size: 24" Jumbo
Adorable & nice but... I hate writing adverse reviews but I had to for this one. It lasted exactly 1 minute. 30 seconds of that was Ghost pulling the rest of the stuffing out to completely gut this Lambie. I know what happened-The material on the chest and the little red buttons were the issue. Cute as it may be, that material is terrible. My Great Pyrenees/AmStaff/Golden Retriever Mix boy, Kota-Ghost, very rarely tears his stuffy squeaky toys up. He is only 7 months old and has only shown interest in tearing something up if it was already broken(had an existing rip or tear)This is only the 2nd or 3 toy he has torn up in his whole life(and he literally has at least 30 stuffy toys(some left by my sweet Bella--she passed away in March but most are brand new because when I saw he wasn't a Destructo-Dog, I went a bit overboard buyin him stuffies-So much that my Hubs was not happy with me but he was secretly glad I did it😈.) See my review for the Jumbo Lambchop toy-That toy was and IS quite possibly the best stuffed squeaky toy available for bigger dogs. Only the MultiPet brand Jumbo tho-There are other brands that arent great. You can tell by the materials used on the face of the real Jumbo 24 inch ones from MultiPet. The Jumbo was a much better experience for us! I have also ordered the smaller one for him becuz he really wants the cat's lambie toy too. They have the 6 inch, not the "cat toy" version and they(and Ghost)love it. No one tears it up. I'll review it once his is delivered because while I know he doesnt rip the 6 inch one apart it is technically the cat's toy(not his) and we usually make him give it back to them pretty quickly. Ill review it when he gets his own & is allowed to do whatever he chooses. Hopefully he will treat it like Jumbo Lambie...Ok well, maybe not exactly that way cuz...Well, Lets just say he gets very, erhmm, frisky with his Jumbo Lambie. He doesnt like when we wash her but we do. Unfortunately he tries to take her outside in the dirt and/or in the pool with him. I will mention that more in my review for Jumbo Lambie. As for this standing up version-It MIGHT be fine for your dog or cat but it definitely was not durable for my Ghostie. It is a good size for a smaller/medium sized dog but definitely not good for puppies & especially those that still have their deciduous(milk/needle)teeth and not for even light to moderate chewers due to the material on the chest. That's what made Ghost tear his up. He nicked it with his teeth, a hole formed and that was apparently his cue to rip the squeaker out & tear the poor toy to shreds-He did have fun doing it tho. Haha. For some dogs this toy might be great fun. It is definitely a great brand and the jumbo version is Ghost's fave toy of all time. Pricing on all of MultiPet's dog toys are amazing and I hope they stay that way! We keep several of the Jumbo Lambies here in case one "goes swimming" so we can wash it and he has one to carry/cuddle or in case one gets temporarily left behind somewhere cuz he wants to take it everywhere he goes. We let him bring her along except for on walks
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Reviewed in the United States on October 24, 2025
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dcp
San Leandro, US
★★★★★ 5
Very cute, good quality
Style: Lambchop, Size: 10", Style: Lambchop, Size: 10"
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