268M0204670 Mercury MerCruiser 26 8M0204670 Gearcase Seal | Genuine Quicksilver OEM Part

🔧 Product Description

Genuine Quicksilver Propeller Shaft / Bearing Carrier Oil Seal - Part Number: 26-8M0204670

Genuine Quicksilver gearcase oil seal used in Mercury / Mariner outboard and MerCruiser stern drive propeller shaft bearing carrier assemblies. This current seal supersedes 26-76868 and related earlier seal numbers including 26-30550, 26-70019 and 26-73838. It is commonly used as a propshaft / bearing carrier oil seal on supported 30HP to 250HP outboards and MerCruiser Alpha / Bravo drives.

⚙️ Key Features

• Genuine Quicksilver OEM gearcase oil seal
• Correct current Mercury part number 26-8M0204670
• Supersedes 26-76868 and earlier seal references
• Prop shaft / bearing carrier seal application
• Typical dimensions: 1.188" shaft x 1.692" outside diameter x 0.250" width
• Cross-references with Sierra, GLM, Mallory, Honda and OMC seal equivalents

🚤 Compatibility

Commonly used on

• Mercury / Mariner outboard propeller shaft bearing carrier assemblies
• MerCruiser Alpha sterndrive propeller shaft seal stacks
• MerCruiser Bravo sterndrive propeller shaft seal stacks
• Honda, OMC and Force cross-reference applications using the same seal dimensions

Typically suits

• Engine / drive models:
• Mercury / Mariner 30HP through 250HP outboard gearcases where seal 26-76868 / 26-8M0204670 is specified
• Mercury 75HP, 90HP, 100HP, 115HP, 125HP gearcases where this bearing carrier seal is shown
• Mercury V-135, V-150, V-175 and V-200 gearcases where specified
• Mercury 200HP, 225HP and 250HP outboard gearcases where specified
• Mercury high-output EFI / DFI / OptiMax gearcases where the bearing carrier diagram lists 26-8M0204670
• MerCruiser R / MR / Alpha One stern drives where seal 26-76868 / 26-8M0204670 is specified
• MerCruiser Alpha One Gen II stern drives where specified
• MerCruiser Bravo One, Bravo Two and Bravo Three stern drives where specified
• Force / Chrysler gearcases using 26-76868 cross-reference seal
• HP Range: commonly 30HP - 250HP Mercury / Mariner outboards where specified, plus MerCruiser Alpha / Bravo sterndrives
• Engine / Drive Type: Mercury / Mariner outboard and MerCruiser stern drive gearcase
• System Type: Propeller shaft / bearing carrier oil seal

🔌 Function

The seal retains gear oil inside the gearcase and prevents water from entering around the propeller shaft / bearing carrier area.

⚠️ Common Signs of Failure

• Milky or water-contaminated gear oil
• Gear oil leaking behind propeller
• Failed lower-unit pressure or vacuum test
• Fishing line damage around prop shaft
• Seal lip hardened, cut or worn
• Replacement required during bearing carrier or prop shaft seal service

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 26-8M0204670 → Supersedes 26-76868
• 26-76868 earlier OEM oil seal reference
• 26-76868B earlier formatted seal reference
• 26-73838 earlier seal reference
• 26-70019 earlier seal reference
• 26-30550 earlier seal reference

OEM / Related Numbers

• 26-8M0204670
• 8M0204670
• 268M0204670
• 26-76868
• 26-76868B
• 76868
• 26-73838
• 73838
• 26-70019
• 70019
• 26-30550
• 30550
• Propeller shaft oil seal
• Bearing carrier oil seal
• Gearcase oil seal
• 26-14077 related prop shaft seal
• 25-31534 related bearing carrier O-ring
• 25-8M0214920 current bearing carrier O-ring

Aftermarket / Verified Equivalents

• Sierra: 18-2002
• GLM: 85130
• Mallory: 9-76202
• Honda: 91252-ZW1-003
• Johnson / Evinrude / OMC: 0320862
• OMC: 320862
• OMC related references: 0508520, 0509330, 0775424, 0778172
• Chrysler / Force / US Marine: 26-76868
• WSM / aftermarket prop shaft oil seal equivalents for 26-76868 / 26-8M0204670 applications

📦 Condition

• Genuine Quicksilver part
• Brand new
• Supplied in original or equivalent packaging