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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4.9 ★★★★★
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Comms Guru
Omaha, US
★★★★★ 5
Small pump works as advertised. Needs longer hose
Color: Orange, Number of Items: 1, Color: Orange, Number of Items: 1
This is a physically small, light pump which matches my light duty application. I have a Solterra EV. While all cars need the tire pressure set properly, it is more important on an EV. I need to change the pressure by 2 or 3 pounds at a time on 4 tires to maintain 38psi. The pump performs beautifully. It pumps up to the 38psi I set on the pump and stops right on the button. I verified the pressure with my pressure gauge which agrees with the tire pressure monitor in the car. The pump performs accurately. The 5 button control on the device is implemented quite well making it easy to operate. It only took a minute to figure it out. My only complaint is the hose is too short. All the battery operated pumps I see have a hose that is too short. I purchased a longer hose from Amazon: https://www.amazon.com/dp/B0D2X52HY8?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_2&th=1 The longer hose allows me to stand instead of bend over if I am holding the pump. I can set the pump down on the garage floor even if the schrader valve is at the 12 o’clock position on my 19 inch tires. The hose is quite flexible and easy to use. I understand some rims have tight quarters around the valve. Make sure there is room around the valve for this chuck. Overall, this does what I need and consumes only a small space in my cargo area. Quite pleased.
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Reviewed in the United States on March 30, 2026
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annita fejeran
Cuba, US
★★★★★ 5
Works great!
Color: Orange, Number of Items: 1
This works great! It is kind of bulky and big but I guess that's for the air. I use it for everything and it's portable to take on the go. Love all the attachments that it comes with. Very versatile. Display reads perfectly and correct and the inflation is super fast. Will definitely buy again!
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Reviewed in the United States on May 27, 2026
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Parashar K.
Fort Morgan, US
★★★★★ 4
Works reasonably well, though with an Achilles' Heel.
Color: Orange, Number of Items: 1
I've had to use this on tires that were very low, both on cars and on bicycles. It works exactly as you'd expect and absolutely has no trouble handling the much higher pressures of bike tires as well as the much larger volumes of typical car tires. I kind of wish it came with some sort of pouch or something because the box it comes in is the only means to store it with all of its attachments,; Because of how tightly it's all packed in the box, it's a bit of a pain getting it all arranged neatly in the box each time, but that's a minor quibble. If Amazon reviews allowed fractional star earnings, I'd probably rate this more accurately a 3.75 or 3.875. It still has two little flaws. One is the accuracy of its pressure gauge. It always seems to fall just a little short. For example, on my car, recommended cold pressure is 36 psi in front and 39 in the back. I tried pumping to those levels, and everything looked fine. But immediately afterwards, the TPMS sensors would tell me I'm at 35 and 37. Likewise, I like to keep my bike tires at around 42 psi for my commuter bike and around 70 psi for a road bike. After using this little guy, and double checking with a separate gauge, I was getting closer to 40 psi and 67.5 psi respectively. I'm inclined to believe it's a calibration/QC problem and there might be examples that overinflate, too. So while I got one that was overestimating the actual pressure, you might get one that has the opposite issue. Still, close enough that I'm not docking it a full point for this, but a faction of a point. The biggest weakness of this device is really a double-edged sword -- its compactness. The fact that it is compact means that it fits very nicely in the under-trunk storage or even a glovebox in some cars. Problem is that when the device is small, so too is the battery. There's just no escaping this. I had a moment with all 4 tires on my car being on the low side in terms of tire pressure. They were all underinflated by about 6-7 psi below spec and so I just used this pump to get them all up to that target pressure. Even with a full charge, I could not get all 4 tires all the way up to target pressures. I could get the 4th tire about halfway there, but that was where the battery died. That's just a reality you will probably have to live with. Given that it is such a small device, this is basically inevitable, so there's no sense complaining about it, but it is a reality you should be aware of.
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Reviewed in the United States on November 6, 2025
D
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David C. Olson
Draper, US
★★★★★ 5
An Easy DIY Headlight Restoration Kit with Strong Appeal
Size: 1 Count (Pack of 1)
This restoration kit is appealing because it offers a way to improve cloudy or oxidized headlights without needing power tools. That makes it accessible for people who want to do the job themselves without investing in extra equipment. Cerakote also has a strong reputation in protective coatings, which gives this kit added credibility compared with generic restoration products. The biggest selling point is the promise of restoring clarity while adding a protective finish to help maintain the results. If the process is easy to follow and the wipes are effective, this can be a worthwhile DIY option for improving both appearance and nighttime visibility. For vehicle owners with faded headlights, this seems like one of the more convenient restoration approaches available.
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Reviewed in the United States on May 18, 2026
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Tural Farziev
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★★★★★ 5
Perfect
Size: 1 Count (Pack of 1), Size: 1 Count (Pack of 1)
Honestly one of the best headlight restoration kits I’ve used. The instructions were simple, the process was easy to follow, and the results were way better than expected. My headlights were heavily oxidized and yellow, and after using the 2000/3000 grit sanding steps with the ceramic coating, they looked almost brand new again. The ceramic finish made them crystal clear and glossy. Definitely worth the money and much better than cheap polish-only kits.
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