26-8M0204708 Mercury MerCruiser Oil Seal | Genuine Quicksilver OEM Part

🔧 Product Description

Genuine Quicksilver Shift Shaft Oil Seal - Part Number: 26-8M0204708

A genuine Quicksilver lower-unit shift-shaft oil seal for selected Mercury and Mariner outboards and MerCruiser Vazer drive assemblies.

The seal fits around the shift shaft in the gear housing or bell-housing assembly. It retains gear lubricant inside the housing while preventing cooling water and external contamination from entering around the shift shaft.

⚙️ Key Features

• Genuine Quicksilver OEM shift-shaft oil seal

• Correct current Mercury part number 26-8M0204708

• Supersedes earlier seal 26-8164641

• Double-purpose gear-lubricant retention and water-exclusion seal

• Cross-references with Sierra, GLM, Mallory, Recmar and Honda numbers

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 26-8M0204708 → Supersedes 26-8164641

• 26-8164641 → Related to earlier 816464 seal reference

• 816464 earlier OEM base reference

OEM / Related Numbers:

• 26-8M0204708

• 8M0204708

• 268M0204708

• 26-8164641

• 8164641

• 816464

• 76384

Aftermarket / Verified Equivalents:

• Sierra: 18-2054

• GLM: 85581

• Mallory: 9-76116

• Recmar: REC26-8164641

• Honda Marine: 91253-ZW1-003

🚤 Compatibility

Commonly used on:

• Mercury and Mariner outboard shift-shaft sealing assemblies

• Lower gear housings using the 816464-series shift-shaft seal

• MerCruiser Vazer bell-housing and shift-shaft applications

Typically suits:

• Engine models:

• Mercury / Mariner 35HP 2-stroke

• Mercury / Mariner 40HP 2-cylinder, 3-cylinder and 4-cylinder

• Mercury / Mariner 45HP 2-stroke

• Mercury / Mariner 50HP carburetted and EFI

• Mercury / Mariner 55HP and 55 SeaPro

• Mercury / Mariner 60HP carburetted, EFI and four-stroke

• Mercury / Mariner 65HP 3-cylinder

• Mercury / Mariner 70HP 3-cylinder

• Mercury / Mariner 75HP 2-stroke, four-stroke and DFI

• Mercury 80 Jet

• Mercury / Mariner 90HP 2-stroke, four-stroke and DFI

• Mercury / Mariner 100HP EFI and 2-stroke

• Mercury / Mariner 115HP 2-stroke, EFI and four-stroke

• Mercury 120 Force-based applications using the corresponding gear housing

• Mercury / Mariner 125HP 2-stroke

• Mercury V135, V150, V175 and V200 2.0L / 2.5L applications using the corresponding shift-shaft housing

• Mercury XR4, Laser and Magnum II gearcase applications

• MerCruiser Vazer drive shift-shaft seal applications

• HP Range: 35HP - 200HP

• Engine Type: Mercury / Mariner 2-stroke, four-stroke, EFI and DFI outboard; MerCruiser Vazer

• Year Range: Approximately mid-1980s through the 2010s, dependent on gearcase and serial number

🔌 Function

The oil seal closes the clearance around the lower-unit shift shaft. It prevents gear lubricant leaking out and blocks water from entering the gear housing during operation.

Common signs of failure:

• Gear lubricant leaking around the shift shaft

• Milky or water-contaminated gear oil

• Gearcase fails pressure or vacuum testing

• Corrosion around the shift-shaft bore

• Gear-lubricant level falling without visible propeller-shaft leakage

📦 Condition

• Genuine Quicksilver part

• Brand new

• Supplied in original or equivalent packaging