Mercury Mariner Lower Unit Seal Kit 26-76868 8M0204670 for 30-125 HP 3 4 Cylinder
Mercury Mariner Lower Unit Seal Kit 26-76868 8M0204670 for 30-125 HP 3 4 Cylinder
Product Overview
Lower unit seal kit for Mercury and Mariner outboards, supplied as two oil seals, one O-ring seal and two drain gaskets. It replaces Mercury 26-76868 and 8M0204670. Fits 30 HP to 125 HP three-cylinder and four-cylinder two-stroke and four-stroke models. The kit covers the seals that fail first on a gearcase that has been run in salt water: a weeping propshaft seal lets water into the oil and the oil turns milky, and by the time it shows at the drain plug the gears have already run on contaminated oil.
Specifications & Attributes
| Specification | Detail |
|---|---|
| Condition | New / New with tags |
| Type | Lower Unit Seal Kit |
| Engine Type | Mercury and Mariner outboard |
| Horsepower Covered | 30 HP to 125 HP, 3-cylinder and 4-cylinder |
| Engine Stroke | 2-stroke and 4-stroke |
| Seal Sizes | Oil seal 30.2 x 44.6 x 8.6 mm; O-ring 98 mm outer diameter x 3.5 mm |
| Components | 5 pieces |
| Country of Origin | Taiwan |
| Packaging | 15 x 18 x 4 cm (5.9 x 7.1 x 1.6 in) |
OEM Cross Reference
| Brand | OEM Part Numbers |
|---|---|
| Mercury / Mariner — Lower Unit Seal Kit | 26-76868, 8M0204670 |
The seals inside this kit are supplied as a matched set and are not sold separately.
Compatible Engines
Fits the following Mercury and Mariner outboards:
| Horsepower | Cylinders | Notes |
|---|---|---|
| 30 HP – 60 HP | 3-cylinder | Fits the 2.33:1 Bigfoot gearcase only |
| 75 HP – 125 HP | 4-cylinder | All gear ratios |
Both 2-stroke and 4-stroke models are covered. On the 30 HP to 60 HP range this kit suits the 2.33:1 gear ratio, commonly known as Bigfoot, and will not fit the standard-ratio gearcase.
What's Included
| Component | Qty |
|---|---|
| Oil Seal — upper | 1 |
| Oil Seal — lower | 1 |
| O-Ring Seal | 1 |
| Drain Fill Washer Gasket | 2 |
Condition & Warranty
| Item | Detail |
|---|---|
| Condition | New / New with tags |
| Warranty | Standard |
| Packaging | Sealed retail packaging |
Before You Buy
- Verify your engine model or serial number before ordering
- On 30-60 HP this kit fits the 2.33:1 Bigfoot gearcase only — check your gear ratio first
- Renew every seal in the kit whenever the gearcase is opened; mixing one old seal with new ones will leak again
- Check the propshaft and bearing carrier for scoring while the seals are out — a scored shaft will destroy a new seal
- Pressure test the gearcase after assembly and before refilling with oil
- 30-Day Easy Returns
- Free Worldwide Shipping
- OEM Quality Without the Markup
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Boat Owners' Review
Before You Buy
Frequently Asked Questions
What is your refund policy?
We offer a 14-day hassle-free return on all products. Items must be unused and in original packaging. Every XRmarine part is also covered by our 1-year warranty against manufacturing defects. If something is not right, email us at info@xrmarineparts.com — replacement or full refund, your choice.
See our full Refund Policy for complete details.
How does shipping work?
Free international shipping on every order — no minimums. We operate a global warehouse network with a main distribution centre in Asia (10-20 business days). We also hold stock in regional warehouses across the United States, Germany, the United Kingdom, Australia, and Poland (opening soon) — most orders arrive in 1-3 business days within those countries and in 2-8 business days to nearby regions. Tracking included.
See our full Shipping Policy.
How do you keep prices fair?
We cut out the middlemen. XRmarine sources directly from quality manufacturers and sells at honest prices. Same OEM-quality parts, no dealership markup. Every order comes with free shipping, real expert support, and a 1-year warranty.
Learn more on our About Us page.
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We currently accept PayPal — a fast, secure way to pay online. Credit card payments (Visa, Mastercard, American Express) and Shopify Payments are being set up and will be available soon. We appreciate your patience.