SKU: 1472556773

27-8M0089639 Lower Unit Seal Kit for Mercury Mariner 25HP 30HP | JLM Marine

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Description

27-8M0089639 Lower Unit Seal Kit for Mercury Mariner 25HP 30HP | JLM MarineLower Unit Seal Kit Fits Mercury Mariner 25 30HP 2 Stroke Outboards This lower unit seal kit is designed for Mercury Mariner 2 cylinder, 2 stroke outboards rated at 25HP and 30HP, including Jet models. It provides a complete sealing solution for lower unit maintenance and rebuilds on international models from serial number 0N055505 and up. This aftermarket replacement directly crosses to OEM part numbers 27 8M0089639, 27 8M0089636, 95220A1, and

Lower Unit Seal Kit – Fits Mercury Mariner 25-30HP 2-Stroke Outboards

This lower unit seal kit is designed for Mercury Mariner 2-cylinder, 2-stroke outboards rated at 25HP and 30HP, including Jet models. It provides a complete sealing solution for lower unit maintenance and rebuilds on international models from serial number 0N055505 and up.

This aftermarket replacement directly crosses to OEM part numbers 27-8M0089639, 27-8M0089636, 95220A1, and 804908A01, ensuring compatibility across multiple Mercury Mariner service part references.

  • Complete seal kit with gasket for lower unit service
  • Fits 2-cylinder, 2-stroke 25HP and 30HP models (including Jet configurations)
  • Direct replacement for multiple OEM part numbers

Part Number Cross-Reference

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

Brand Part Number
Mercury Mariner 27-8M0089639
Mercury Mariner 27-8M0089636
Mercury Mariner 95220A1
Mercury Mariner 804908A01

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 Notes
Mercury Mariner 25 (2 CYL.)(International) 25HP 2-Stroke Serial 0N055505 & Up
Mercury Mariner 25 Jet (2 CYL.)(International) 25HP 2-Stroke Serial 0N088578 & Up
Mercury Mariner 30 (2 CYL.)(International) 30HP 2-Stroke Serial 0N055505 & Up

Technical Specifications

Specification Value
Product Type Lower Unit Seal Kit
Engine Type 2-Cylinder, 2-Stroke
Compatible HP 25HP, 30HP
Application Mercury Mariner Outboard Lower Unit

Package Contents

This kit includes the following components:

  • 1 x Lower Unit Seal Kit with Gasket

Installation Guide

  1. Disconnect the outboard from the power source and secure the motor in a stable position. Remove the lower unit from the gear housing following your service manual.
  2. Drain all gear oil completely and inspect for contamination or metal debris. Clean all mating surfaces thoroughly with a suitable solvent.
  3. Remove the old seals, gaskets, and O-rings from the lower unit housing. Inspect bearing surfaces and shift components for wear or damage.
  4. Install new seals from the kit using a seal driver or appropriately sized socket. Ensure each seal seats squarely without cocking or distortion.
  5. Apply a thin layer of marine-grade grease to seal lips before assembly. Position the new gasket carefully, ensuring all bolt holes align.
  6. Reassemble the lower unit to the gear housing, torquing all fasteners to manufacturer specifications. Refill with the correct grade and quantity of gear oil.
  7. Check for proper shift engagement and smooth operation before returning the outboard to service. Test run and inspect for leaks.

Troubleshooting & FAQ

Q: How do I confirm this seal kit fits my Mercury Mariner outboard?
A: Verify your engine model, HP rating, and serial number against the compatibility table above. Models must be 2-cylinder, 2-stroke, 25HP or 30HP (including Jet) with serial numbers 0N055505 and up (0N088578 for Jet models). Cross-reference your current seal kit part number with 27-8M0089639, 27-8M0089636, 95220A1, or 804908A01.

Q: What are the signs that my lower unit seals need replacement?
A: Common symptoms include gear oil leaking from the lower unit, water contamination in the gear oil (milky appearance), difficulty shifting gears, or unusual noise from the lower unit during operation. Regular inspection during seasonal maintenance is recommended.

Q: How often should I replace lower unit seals?
A: Replace seals during lower unit rebuilds, whenever the lower unit is disassembled for service, or if you observe leaks or water intrusion. Many mechanics recommend inspecting seals annually and replacing them every 2-3 years or 200-300 hours of operation, depending on usage conditions.

Q: Can I use this aftermarket seal kit instead of the OEM Mercury part?
A: Yes, this aftermarket seal kit is manufactured to OEM specifications and provides equivalent sealing performance. It directly replaces OEM part numbers 27-8M0089639, 27-8M0089636, 95220A1, and 804908A01. Many marine technicians use quality aftermarket seals for routine maintenance and rebuilds.

Q: OEM vs. Aftermarket?
A: 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.

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

Q: What is your warranty and return policy?
A: 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: 1472556773

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4.3 ★★★★★
Based on 19 reviews
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Product Reviews
R
Reviewer
Carnegie, US
★★★★★ 5
21 Microneedling Pen Cartridges for Dr Pen. Well Made; Sanitary; Perform Well; Good Value
Aiscool 21 Pcs Microneedling Pen Cartridges for Dr Pen A6/N2/M5/M7 Replacement Tips 0.25mm by Aiscool I sampled this 21-piece cartridge set to use with my compatible Dr. Pen device, and I was impressed by the variety included for the price. Having a mix of 36-pin, 12-pin, and round nano cartridges makes this kit much more versatile than single-style refill packs. I liked being able to switch between gentler skincare applications and more focused microneedling sessions without needing separate orders for different cartridge types. The cartridges were individually sealed, which added reassurance about cleanliness and storage. The fit with my compatible device was secure and consistent. Each cartridge locked firmly into place without wobbling or shifting during use, which is something I pay close attention to with replacement tips. The needles moved smoothly across my skin without snagging or dragging, and I did not notice bending or dullness during normal use. The 0.25mm depth is also a comfortable option for lighter at-home treatments with minimal downtime afterward. I also appreciated how convenient this set is for maintaining a regular skincare routine. The nano cartridges worked well for serum application and gentler sessions, while the higher pin counts covered larger areas efficiently. The cartridges themselves are lightweight, and while the plastic housing does not feel especially premium, the actual performance was dependable. I made sure to inspect each sealed cartridge carefully before use, which I would recommend with any microneedling accessory product. For the price, this set delivers strong value if you already own a compatible Dr. Pen model and go through cartridges regularly. The combination of variety, compatibility, and individually sealed packaging makes it a practical refill kit for routine personal skincare use at home. Pros: ✅ Includes 36-pin, 12-pin, and nano cartridge options ✅ Compatible fit with supported Dr. Pen models ✅ Individually sealed for cleanliness and convenience ✅ Needles glide smoothly without dragging ✅ 0.25mm depth works well for lighter at-home treatments ✅ Good value for a 21-piece mixed set Cons: ❌ Plastic housing feels somewhat lightweight ❌ No protective caps over the needle openings ❌ Compatibility limited to certain Dr. Pen models ❌ Requires careful sanitation and inspection before use
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 21, 2026
B
Beebo
Natrona Heights, US
★★★★★ 5
Fit my Dr. Pen perfectly!
I picked up this 21-piece microneedling cartridge set for my Dr. Pen device, and overall it’s a very solid value for at-home use. For the price (around the low $30 range), you’re getting a useful mix of 7 nano, 7 12-pin, and 7 36-pin cartridges, which makes it easy to switch between lighter skincare treatments, product infusion, and more intensive microneedling sessions without buying separate packs. Compatibility was exactly as expected. The cartridges fit my Dr. Pen M7 securely with no looseness or alignment issues. They clicked into place properly and stayed stable during use, with no wobbling or skipping, which is important for a consistent treatment experience. In actual use, the performance was reliable. The needles worked smoothly on the skin, and I didn’t notice any bending or breakage. Each cartridge comes individually packaged, which helps maintain sterility and makes them convenient for single-use sessions. The different tip types also give good flexibility depending on whether you want gentler nano-needling or deeper penetration with the 36-pin option. That said, the build quality is a bit on the simpler side. The cartridges have a slightly plasticky feel and a blue-purple tint, so they don’t look as refined as some higher-end alternatives I’ve used. However, since these are disposable, that cosmetic difference doesn’t really affect performance. Pros Great value for a 21-piece mixed cartridge set Includes nano, 12-pin, and 36-pin options for different treatments Secure fit with Dr. Pen devices, no wobbling during use Individually packaged and sterile for hygiene and convenience Needles perform smoothly without bending or breaking Cons Build quality feels a bit lightweight and less premium Plastic housing looks and feels cheaper than higher-end brands Single-use design means ongoing repurchase required Not much differentiation in “feel” compared to more expensive cartridges during use Overall This is a practical and cost-effective cartridge set for anyone doing regular at-home microneedling. While it doesn’t have the premium finish of higher-end options, it delivers where it matters—fit, sterility, and consistent performance. For the price, it’s a very reasonable and useful refill pack for routine skincare use.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 17, 2026
N
NJ
Lowell, US
★★★★★ 4
Good Variety Pack With Solid Compatibility, But No Protective Caps
This is a review for this 21-piece variety pack of Dr. Pen microneedling cartridges. For around $32, this actually feels like a pretty solid value overall. You’re getting seven nano cartridges, seven 12-pin, and seven 36-pin, so it’s a nice mix depending on whether you’re doing product infusion, lighter treatments, or more intensive microneedling sessions. I always appreciate a variety pack because otherwise you end up buying giant boxes of one type and suddenly becoming emotionally committed to 36-pin needles for the next six years. These fit my Dr. Pen M7/M7S perfectly with no issues clicking into place or staying secure during use. I didn’t have any wobbling, uneven dragging, or weird skipping while microneedling. Functionally, they performed just as well as other replacement cartridges I’ve used. That said, they do look and feel a little cheaper than some other cartridges I’ve purchased before. Not necessarily unusable, just not quite as sturdy or polished-looking. Since these are single-use anyway, that may not matter to everyone, but it was noticeable. My biggest hesitation is that these do not come with protective caps over the needles. To be fair, the listing photos actually do show them packaged this way, so it’s not misleading — they were honest about it — but personally I’m just more comfortable when cartridges have caps for an added sense of sterility and protection. They are individually vacuum sealed with expiration dates, which I do appreciate, but I’ll probably use my capped cartridges first before reaching for these. Because of that, I’d feel a little more comfortable initially using these on areas like the chest or neck rather than jumping straight into facial treatments, at least until I’ve tested them more thoroughly. I’d also definitely be extra cautious about sanitizing everything beforehand. Overall though, for the quantity and variety included, this still feels like a decent buy if you go through cartridges regularly.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 8, 2026
R
Riabiaaa
Waukegan, US
★★★★★ 5
Awesome versatility, affordable, easy to use micro needles for compatible Dr. Pen devices 🫶🏽💉🤩⭐️
This microneedling cartridge refill set is a pretty great value with a convenient mix of multiple needle options. It’s super versatile and should easily meet all your microneedling skincare needs. The cartridges fit securely with compatible Dr. Pen models (mine is 7). MAKE SURE YOURS FITS!! Some devices THREAD, others DO NOT!! This is super important b/c if you don’t have the correct type, there’s nothing you can do to make them work! These refills allow for easy and effective operation without causing skin snagging, tears, or injury (other than ‘micro injury,’ which is what’s intended by the whole concept of Microneedling!). The individually sealed cartridges are sanitary, convenient for travel, and are an excellent choice for any microneedling skincare regimen. While the plastic housing/casing feels somewhat lightweight, the kit’s performance is actually top notch. I do wish they had protective caps for even more superior protection, but it’s a great deal and I can’t complain for the price. It’s a total no-brainer if you have a compatible Dr. Pen Microneedling device.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 3, 2026
M
MJ
Port Orchard, US
★★★★★ 3
Fit My Dr Pen M7 Correctly, But Check Packaging Carefully Before Use
I purchased these replacement cartridges for my Dr Pen M7, and the fit was fine with no compatibility issues. They attached properly and worked as expected during use, so at least from a fit/function standpoint, they seem pretty standard. I also appreciate that the pack includes a variety of cartridge types and needle/pin counts instead of only one style. Having different options is useful depending on the area being treated and personal preference. One thing I did notice though is that the cartridges arrived in Dr Pen branded packaging, and I honestly wasn’t completely sure about the legitimacy/authenticity of them. They may very well be genuine, but it did make me pause a little since there wasn’t much additional verification information included. My biggest concern was that although the packages are labeled sterile, I noticed some type of brown residue/spotting inside one of the sealed cartridge packages. It appeared in multiple spots inside that particular package, so I immediately decided to throw that cartridge away rather than risk using it. Because of that, I would strongly recommend inspecting each cartridge carefully before use and sterilizing again yourself for extra precaution. With microneedling products especially, cleanliness and safety matter a lot. Overall, the cartridges themselves fit and functioned properly with my device, and I like the variety included, but quality control/sterility is something I’d advise paying close attention to before using them.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 19, 2026

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