SKU: 96997052841

Upper Driveshaft Housing Seal Kit – Fits MerCruiser Alpha One Gen II (Replaces 26-88397A1, 88397A1)

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Description

Upper Driveshaft Housing Seal Kit – Fits MerCruiser Alpha One Gen II (Replaces 26-88397A1, 88397A1)Upper Driveshaft Housing Seal Kit Fits MerCruiser Alpha One Gen II This upper driveshaft housing seal kit is designed for MerCruiser Alpha One Gen II stern drives (19912010 models, serial numbers 0M400412 and up). It provides the essential seals and gaskets needed to service the upper driveshaft housing, preventing water intrusion and gear lube leaks. It serves as a direct replacement for multiple OEM and aftermarket part numbers, ensuring broad

Upper Driveshaft Housing Seal Kit – Fits MerCruiser Alpha One Gen II

This upper driveshaft housing seal kit is designed for MerCruiser Alpha One Gen II stern drives (1991–2010 models, serial numbers 0M400412 and up). It provides the essential seals and gaskets needed to service the upper driveshaft housing, preventing water intrusion and gear lube leaks.

It serves as a direct replacement for multiple OEM and aftermarket part numbers, ensuring broad compatibility for a reliable repair.

  • Installation Location: Upper Driveshaft Housing
  • Compatible Models: MerCruiser Alpha One Gen II (1991+)
  • Kit Contents: Includes three oil seals and one gasket for a complete service.

Part Number Cross-Reference

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

Brand Part Number
Mercury / MerCruiser 26-88397A1
Mercury / MerCruiser 88397A1
Sierra 18-2644
GLM 87501
Mallory 9-74302

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 II All 4-Stroke 1991-1995 26-88397A1 Serial Number D469859-F679999
MerCruiser Alpha One Gen II All 4-Stroke 1996-1997 26-88397A1 Serial Number F680000-K999999
MerCruiser Alpha One Gen II All 4-Stroke 1998-2010 26-88397A1 Serial Number L100040 & Up
MerCruiser Alpha One Gen II (CR) All 4-Stroke 1991-1995 26-88397A1 Serial Number D469859-F679999
MerCruiser Alpha One Gen II (CR) All 4-Stroke 1996-2010 26-88397A1 Serial Number F680000 & Up

Technical Specifications

Specification Value
Product Type Driveshaft Housing Seal Kit
Installation Upper Driveshaft Housing
Dimensions Length: 102 mm (4.00"), Width: 95 mm (3.75"), Height: 25 mm (1.00")
Weight 0.059 kg (0.13 lbs)
Warranty 1 year (JLM Marine); OEM warranty for genuine MerCruiser parts
Other Technical Attributes Fits Alpha One Gen II stern drives from 1991 & newer

Package Contents

This kit includes the following components:

  • 2 x Oil Seal (Replaces 26-66302)
  • 1 x Oil Seal (Replaces 26-823894)
  • 1 x Gasket (Replaces 12-19183)

Installation Guide

Professional installation is recommended. The following are general steps for replacement:

  1. Drain Gear Lube: Completely drain the gear lube from the sterndrive into a suitable container.
  2. Separate Drive Halves: Separate the upper and lower units of the sterndrive.
  3. Access Housing: Remove the upper driveshaft housing cover to expose the seals.
  4. Remove Old Seals: Carefully remove the old seals and gasket. Note their orientation and order.
  5. Clean Surfaces: Thoroughly clean the housing and cover surfaces, removing any old sealant or corrosion.
  6. Install New Seals: Press the new seals into place using a proper seal driver, ensuring they are seated squarely without damage.
  7. Install Gasket & Reassemble: Place the new gasket on the clean housing surface and reinstall the cover, torquing bolts to manufacturer specifications.
  8. Rejoin Drive: Reconnect the upper and lower drive units.
  9. Refill & Check: Refill the sterndrive with fresh, high-quality marine gear lube. Check for any leaks before returning to service.

Troubleshooting & FAQ

How do I confirm this seal kit fits my Alpha One Gen II drive?
Check your drive's serial number. This kit is specified for 1991 and newer Alpha One Gen II models, starting from serial number 0M400412 and up. Our compatibility table provides a detailed breakdown of the applicable serial number ranges to help you verify the fit.

What are the signs that my upper driveshaft seals are failing?
Common symptoms include finding water in your gear lube (which gives it a milky, "peanut butter" appearance), noticing a persistent oil sheen on the water around your drive, or observing a visible gear lube leak from the upper housing or weep holes.

Does this kit include everything for the job?
This kit contains the three essential oil seals and one housing gasket required to service the upper driveshaft housing itself. Depending on the extent of your maintenance, additional O-rings or gaskets for other components (like shift shafts or water pumps) may be necessary and are sold separately.

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: 96997052841

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Susan M. Kitchings
Alexandria, US
★★★★★ 5
Good value
Size: Large
So far so good! Seems sturdy enough for my little guy. Good value for the price.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 2, 2026
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katie clenshaw
Los Angeles, US
★★★★★ 5
my dogs love these! their new constant companions!
When I first opened the box and saw these three octopuses, I thought they looked a little anemic, but looks can definitely be deceiving because my dogs love them. We try to be really careful about the toys we buy because one of my dogs swallowed a squeaker in the past and had to have surgery. Ever since then, we've been really mindful about what toys they have and making sure we're watching them when they play. I have to say these have been great. My dogs carry them everywhere. They take them outside, bring them back inside, and I've had to wash them multiple times because they are so loved and so well used. For some reason, my dog who is a constant chewer and destroyer of toys has not chewed through these. They feel relatively tough, especially considering how lightweight they are. They do have a squeaker inside, but they also have something crinkly in them that makes noise when the dogs are running around and playing with them. My dogs seem to love that. My dogs also look super cute running around with the octopus legs hanging out of their mouths. Fun product!
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Reviewed in the United States on June 9, 2026
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Sabrina P.
Lowell, US
★★★★★ 5
Great toys for dogs
I received these octopus toys for my dog because he destroys stuffed toys almost immediately, and I liked that these were no stuffing. They ended up being a big hit right away. The squeakers kept him interested longer than most toys do, and he loves shaking the octopus legs around while playing. Since there’s no stuffing inside, I don’t have to worry about coming home to fluff all over the house, which has honestly been a huge plus. The toys are lightweight and easy for him to carry around, and they work well for toss and fetch too. I have a medium sized dog, but I could see these being fun for smaller or even larger dogs depending on how aggressive of a chewer they are. They seem decently durable for plush toys. Mine have held up better than expected considering how rough my dog can be with his toys. The stitching has stayed together pretty well so far. I also like that the pack comes with three because one is always getting hidden somewhere in the house. It’s nice having extras ready to go. These have definitely helped keep my dog entertained and busy, especially on days when we can’t spend as much time outside.
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Reviewed in the United States on May 28, 2026
A
Amazon Customer
Louisville, US
★★★★★ 5
Durable Octopus Toys That Have Survived My Little Destroyer
Durable Octopus Toys That Have Survived My Little Destroyer These octopus dog toys have been a big hit with our Boston Terrier, who treats every toy like a personal mission to destroy it as quickly as possible. Surprisingly, these have held up really well so far. The toys arrived a little flattened and crinkled because they were packed into a fairly small box, but once opened they shaped up fine and still looked good. The material feels durable, and I like that there’s no stuffing inside to explode all over the house once the chewing begins. As expected, the squeakers only survived a few minutes, but honestly that’s normal in our house and not really a knock on the toy itself. The important part is the toys themselves have not been ripped apart yet, which is impressive for our aggressive little chewer. The colors are bright, the faces are funny, and the overall construction feels stronger than a lot of plush-style dog toys we’ve tried before. At the time of my review, these feel like a great value for a durable and entertaining 3-pack. Overall, a fun and surprisingly tough set of dog toys that have managed to survive longer than most in our house.
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Reviewed in the United States on May 21, 2026
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SLee
Grantham, US
★★★★★ 4
No Foam, No Stuffing, No Mess. Just a Dog Toy that the Dog Loves
I received this product at no cost through the Amazon Vine program in exchange for my review. Our dog took to this right away, which is the most important review criterion as far as we are concerned. The crinkly noise is a big hit with him, consistent with similar toys we have given him in the past that he has gravitated toward. The standout practical feature for anyone tired of cleaning up after destructive chewers is the absence of foam or stuffing. If you have spent any time finding bits of foam or clumps of stuffing scattered under your furniture you will immediately appreciate this design choice. Less mess without sacrificing the sensory experience the dog is after. The long legs are also worth mentioning as a functional design element. Our dog clearly enjoys the feedback from shaking his toys and the legs deliver exactly that kind of satisfying resistance and movement. A well thought out toy that works for the dog and makes life a little easier for the owner. I do have a nagging concern about a generic/no name brand, but I do recognize that many if not all of the dog toys we have are also made in the same region and maybe even the same factory.
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Reviewed in the United States on May 20, 2026

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