# 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

  

🔄 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

  

🚤 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

  

📦 Condition

  

• Genuine Quicksilver part

• Brand new

• Supplied in original or equivalent packaging

## Details

- **Price:** 33.9 AUD
- **Vendor:** Quicksilver
- **Tags:** Quicksilver Marine Parts | Oils Service Kits & Engine Components

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 33.90 AUD | In stock |

## Images

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

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/268m0204670-mercury-mercruiser-26-8m0204670-gearcase-seal-genuine-quicksilver-oem-part)
> Updated: 2026-07-18