SKU: 93494890265

Complete MerCruiser Alpha One Gen II Bellows Kit 4-Piece Set (74639Q02 + 816431A1 + 18654A1 + 27-94996Q2) - Shift Cable/U-Joint/Exhaust Bellows + Bell Housing Gasket Kit - Fits 1991 & Newer Models

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Description

Complete MerCruiser Alpha One Gen II Bellows Kit 4-Piece Set (74639Q02 + 816431A1 + 18654A1 + 27-94996Q2) - Shift Cable/U-Joint/Exhaust Bellows + Bell Housing Gasket Kit - Fits 1991 & Newer ModelsComplete MerCruiser Alpha One Gen II Bellows Maintenance Kit This comprehensive bellows maintenance kit is engineered for MerCruiser Alpha One Generation II sterndrive systems (1991 and newer). It provides a complete 4 component sealing solution, with each part manufactured to meet or exceed OEM specifications. The kit includes replacements for shift cable, U joint, and exhaust bellows, plus a full bell housing gasket set. Constructed from marine

Complete MerCruiser Alpha One Gen II Bellows Maintenance Kit

This comprehensive bellows maintenance kit is engineered for MerCruiser Alpha One Generation II sterndrive systems (1991 and newer). It provides a complete 4-component sealing solution, with each part manufactured to meet or exceed OEM specifications. The kit includes replacements for shift cable, U-joint, and exhaust bellows, plus a full bell housing gasket set.

Constructed from marine-grade rubber compounds and stainless steel hardware, these components are designed to withstand harsh saltwater and freshwater environments. This kit offers a cost-effective solution for performing a complete sterndrive service, ensuring all parts are compatible and preventing water intrusion into critical engine systems.

  • Fits: MerCruiser Alpha One Gen II (1991-Present) and select R/MR Series (1983-1990).
  • Directly replaces part numbers: 74639Q02, 816431A1, 18654A1 / 8M0124227, and 27-94996Q2.
  • This is a complete 4-part kit containing one of each: Shift Bellows, U-Joint Bellows, Exhaust Bellows, and a Bell Housing Gasket Kit.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM andbrands.

Component Our Part # Replaces Sierra P/N Replaces GLM P/N Superseded OEM #s
Shift Cable Bellows 74639Q02 18-2753, 18-2753-2 89080 74639A2, 74369, 31659
U-Joint Bellows 816431A1 18-2747 89050 60932A1, 60932A4
Exhaust Bellows 18654A1 18-2750 89100 32734A3, 32734 (Now 8M0124227)
Gasket Kit 27-94996Q2 18-2619-1 Contact for P/N 27-94996A1, 27-94996T2, 27-64818A3

Compatible Engine Models

Confirm your engine model/year in the table below.

MerCruiser Alpha One Gen II (1991-Present)

Serial Number Ranges: 1991-1995 (0D469859-0F679999), 1996-1997 (0F680000-0K999999), 1998 & Up (0L100040+)

Engine Model Horsepower Displacement Cylinders Year Range Gear Ratio
3.0L 135 HP 3.0L 4-Cylinder 1999-2016 2.00:1
4.3L 190-220 HP 4.3L V6 1991-Present 1.81:1
5.0L 220-260 HP 5.0L V8 1991-Present 1.62:1
5.7L 250-300 HP 5.7L V8 1991-Present 1.47:1
350 Mag 300 HP 5.7L V8 1991-Present 1.47:1

MerCruiser R/MR Series (1983-1990)

Serial Number Requirement: 6225577 and higher

  • 165 HP (2.5L 4-Cylinder)
  • 170 HP (3.7L 4-Cylinder)
  • 190 HP (4.3L V6)
  • 260 HP (5.7L V8)

Additional Compatible Systems

  • Vazer Sterndrive Systems (U-Joint Bellows 816431A1 component only)
  • Bravo I, II, III & Blackhawk (Selected components may be compatible - consult technical support)

Technical Specifications

Specification Value
Maximum Supported Horsepower 300 HP (Gasoline Engines)
Maximum Boat Speed 65 mph
Gear Ratio Range 1.47:1 - 2.00:1
Operating Environment Saltwater and Freshwater
Kit Gross Weight 1100g (2.43 lbs)

Package Contents

  • 1x 74639Q02 - Shift Cable Bellows Assembly with 2 Stainless Steel Hose Clamps
  • 1x 816431A1 - U-Joint Bellows Assembly with Grounding Straps and Clamps
  • 1x 18654A1 / 8M0124227 - Exhaust Bellows Assembly with 2 Stainless Steel Hose Clamps
  • 1x 27-94996Q2 - Bell Housing Installation Gasket Kit (6-piece set)

Installation Guide

  1. Preparation: Cool the engine completely. Place the shift control in the forward gear position.
  2. Sterndrive Removal: Disconnect the trim cylinders and remove the six 5/8" nuts securing the sterndrive to the bell housing. Carefully pull the sterndrive unit away. Always use a new mounting gasket upon reassembly.
  3. Bell Housing Removal: Disconnect the shift cable inside the boat. A specialized hinge pin tool is required to remove the two hinge pins. Preserve the fiber washers.
  4. Component Removal: Remove the old exhaust bellows, water hose, shift cable bellows, and U-joint bellows.
  5. Surface Cleaning: Thoroughly clean all gimbal and bell housing flange surfaces where the new bellows will be seated.
  6. Adhesive Application: Apply a marine-grade bellows adhesive (mandatory for the U-joint bellows) to the inner lips of the new bellows and the housing flanges.
  7. Bellows Installation: Install the grounding straps on the U-joint bellows. Install the bell housing end first, then the gimbal housing end for each bellows.
  8. Clamp Installation: Secure all new bellows with new stainless steel hose clamps and tighten to specification.
  9. Gasket Installation: Ensure surfaces are clean and oil-free. Install the correct gaskets from the kit in the proper sequence as per your service manual.
  10. Reassembly: Carefully guide the bell housing and sterndrive back into position, securing with hinge pins and all mounting nuts.
  11. Final Connections: Reinstall the trim cylinders and all other disconnected components.
  12. Final Testing: Once assembled, check for any water or oil leaks. Verify smooth shifting through all gears before operating the vessel.

Troubleshooting & FAQ

How do I confirm this kit fits my MerCruiser sterndrive?

This kit is specifically for MerCruiser Alpha One Gen II drives manufactured from 1991 to the present. You should verify your drive's serial number falls within the ranges listed in our compatibility chart (e.g., 0D469859 and up). It also fits some older R/MR series drives (1983-1990) with a serial number of 6225577 or higher. When in doubt, compare the part numbers to your service manual.

Is bellows adhesive required for installation?

Yes. Applying a suitable marine bellows adhesive is absolutely mandatory for the U-joint bellows (816431A1). This step is critical to creating a durable, watertight seal. Failure to use adhesive on this component will likely lead to water intrusion and severe damage to the gimbal bearing and U-joints.

How often should I replace the bellows in this kit?

Under normal freshwater or intermittent saltwater use, a replacement interval of 3-5 years is recommended. For boats used heavily in saltwater or kept in the water year-round, a more conservative interval of 2-3 years is advised for preventive maintenance. Replace the entire kit immediately if you discover any cracks, tears, or signs of water leakage.

What are the common signs of a failing bellows?

The most critical sign is finding water in your bilge, which could indicate a failed U-joint bellows. Other symptoms include difficulty or grinding when shifting gears (failed shift cable bellows), or abnormal exhaust sounds and potential water backflow (failed exhaust bellows).

OEM vs. Aftermarket?

This listing is anreplacement 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 anreplacement 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: 93494890265

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Gabrila
Charlottesville, US
★★★★★ 5
Highly Recommend – Amazing Results on My Honda Accords!
Size: 1 Count (Pack of 1), Size: 1 Count (Pack of 1)
I recently used the Cerakote Headlight Restoration Kit on both my 2008 and 2014 Honda Accords, and I’m genuinely impressed. The headlights on both cars were badly oxidized, hazy, and yellowed from years of sun exposure. After following the kit’s instructions, they look crystal clear and almost like new again. The process is pretty straightforward and beginner-friendly. It does take roughly an hour per headlight set if you follow all the steps carefully and allow proper air drying time before the final clear coat. There’s a bit of elbow grease involved with the sanding and polishing stages, but nothing overly difficult. The kit provides everything you need, and the instructions are clear. The results are excellent! Both cars now have headlights that look factory-fresh. I’m really happy with how bright and clear they are at night. Best part? I saved a ton of money by restoring them instead of buying expensive OEM replacements. The only minor uncertainty is long-term durability (how well the clear coat holds up after a couple years of sun, weather, and car washes), but for the price and the dramatic improvement I saw, it’s absolutely worth it. I’d definitely buy this kit again if needed. Highly recommended for anyone dealing with cloudy headlights. Great product that delivers professional-looking results at a fraction of the cost!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 3, 2026
C
Verified Purchase
Cleaver
Pawtucket, US
★★★★★ 4
Best product I've tried so far but still temporary. YMMV.
Size: 1 Count (Pack of 1)
This product really does work. It is the best I've used. I purchased in September 2024 and am writing this review in May of 2026, roughly one year and 8 months later. I noticed product failure a little after a year after application and it has been degrading slowly since. Currently the product is visible like a layer of clear paint flaking off and you can physically scratch some off. Here are the pros and cons. Pros: Clarity, relative ease of use, value Cons: Taping and sanding, doesn't last for as long as you own your car as claimed Best used as a temporary fix. Bottom line, would I use it again? Yes. What am I doing today? Replacing the headlights completely. Why? I plan on keeping my car for longer than a year.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 8, 2026
S
Verified Purchase
Sahiti
Birmingham, US
★★★★★ 5
Review After Using on 3 Different Cars over 3 years
Size: 1 Count (Pack of 1)
Cerakote Headlight Restoration Kit : After Using on 3 Different Cars over 3 years This is my second time purchasing the Cerakote Headlight Restoration Kit, and I’ve now used it across three different vehicles. At this point, I feel comfortable saying this product genuinely works when used correctly. Before trying this kit, I considered replacing my headlights entirely. The cheapest replacement set I found was around $150 just for the parts. Installation would have required removing the grille, bumper, and other components, which adds time and complexity. For an older vehicle, that didn’t make financial sense. Instead, I chose to restore the original headlights. Cost and Value My first package cost me $17, and I restored two cars with that single kit ( about 9$ per pair). That alone made it worth it. For under $20: I restored two separate vehicles Avoided buying new headlight assemblies Avoided removing the bumper and grille Compared to a $150+ replacement plus labor, the savings are significant. Durability 1 year+ under direct Cali sunlight (currently on year 2 and still good) First Car – Learning the Process The first time I used the kit, my results were decent but not perfect. That was mainly because I didn’t fully understand how sanding and polishing actually work. ( this reoxidized fastest under 8 months, but it was mostly my fault) I didn’t initially realize: The headlight needs to stay wet during sanding Oxidation must be completely removed before applying clear coat Even pressure matters/ 50% overlap coverage when appling ceramic Once I understood that sanding is the most important step, everything improved. Second Car (beater) Major Improvement The second vehicle was heavily oxidized and yellowed. I used the remaining material from that same $17 kit and restored it completely. The clarity difference was dramatic. It looked close to factory condition, and night visibility noticeably improved. That was when I realized the product itself is solid; the key is proper technique. Third Car ; Recent purchase By the third car, the process felt straightforward. I followed the instructions carefully, kept the surface wet while sanding, and applied the clear coat evenly in one smooth pass. The final result was clear, glossy, and uniform. No haze, no streaking. Durability On my first vehicle, the restoration lasted close to a year perfectly( I sold that car this year and it still had clear headlights), and that car was parked outside in direct sun most days. For a DIY kit at this price point, that level of durability is impressive. Final Thoughts I seriously considered spending $150 on replacement headlights( this was cheapest ) and dealing with removing body panels. Instead, I spent $17 and restored two cars. Now having used it on three vehicles, I can say this kit is effective, cost-efficient, and worth the time if you follow the process properly. It does require effort and patience, but the results justify it. I would purchase it again.
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Reviewed in the United States on February 18, 2026
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Verified Purchase
YetAnotherITGuy
Draper, US
★★★★★ 5
works as advertised!
Size: 1 Count (Pack of 1)
I purchased this kit to renew the headlights on my 2016 Nissan Frontier pick-up. The headlights had become slightly oxidized and dull -- not that bad but it was bothering me and for the price of the kit I figured it was worth the effort to attempt to renew them. All I can say is -- WOW, what a difference. The end result looked like new -- clean, brilliant and bright. Read the directions (2 or 3 times) and follow them EXACTLY. Total time for me from opening the kit to being done was about 2 hours and I was taking my time. This kit is different in that the final step applies a UV resistant coating which really makes the glass super transparent. Great investment in the time and money. I can't stop admiring my new (old) headlights!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 14, 2026
A
Verified Purchase
Alex
San Leandro, US
★★★★★ 5
Incredible Results! The "Z-Line" is Back!
Size: 1 Count (Pack of 1), Size: 1 Count (Pack of 1)
I’ve tried a few "wipe-on" fixes in the past, but the CERAKOTE® Ceramic Headlight Restoration Kit is in a completely different league. If you are tired of hazy, yellowed lenses and weak nighttime visibility, look no further. 📖 Instructions & Ease of Use The first thing that stood out was the clarity of the instructions. The kit breaks everything down into a simple, step-by-step process. Even if you aren't a "car person," the directions are foolproof. They don't just tell you what to do; they explain why each step matters, which gave me the confidence to get the job done right the first time. ✨ Restoration Effectiveness As you can see in my Before and After photos, the transformation is night and day. My headlights went from a dull, oxidized yellow to a factory-fresh, crystal-clear finish. It didn't just "clean" them—it completely rejuvenated the plastic. 🔦 The Real Test: Light Output & Beam Pattern The most impressive part isn't just how the car looks, but how it performs at night. I’ve included a photo of my car parked against a wall in the dark to show the comparison: Passenger Side (Restored): You can see a sharp, distinct cutoff line and the perfect "Z-line" pattern. The light is focused exactly where it needs to be on the road. Driver Side (Not Restored yet): The light is completely distorted. There is no cutoff, just a messy blob of light that scatters everywhere, likely blinding oncoming traffic while providing less actual visibility for me. Final Verdict This kit doesn't just make your car look better; it’s a genuine safety upgrade. Seeing that crisp Z-line back on the wall proves that the clarity is internal as well as external. Highly recommended!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 15, 2026

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