26816575A4 Mercury MerCruiser Gearcase Seal Kit | Genuine Quicksilver OEM Part

🔧 Product Description

Genuine Quicksilver Gear Housing Seal Kit - Part Number: 26-816575A4

Genuine Quicksilver gear housing seal kit used on Mercury / Mariner V6 3.0L gearcases. This seal kit is used for lower-unit reseal service on selected 200HP, 225HP, 250HP and 300HP EFI / OptiMax / DFI applications, including late 3.0L gear housings and C-3 casting gearcase families.

⚙️ Key Features

• Genuine Quicksilver OEM gear housing seal kit

• Correct Mercury part number 26-816575A4

• Listing reference: 26816575A4

• Lower-unit / gearcase reseal kit

• Used on Mercury / Mariner 3.0L V6 gearcases

• Includes seals and O-rings required for supported gear housing reseal service

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 26-816575A4 current OEM gear housing seal kit reference

• 816575A4 short-form Mercury reference

OEM / Related Numbers:

• 26-816575A4

• 816575A4

• 26816575A4

• Gear housing seal kit

• Lower unit seal kit

• Gearcase seal kit

• 3.0L Mercury seal kit

• C-3 casting gearcase seal kit

Aftermarket / Verified Equivalents:

• Sierra: 18-8382

• GLM: 87512

• Mallory: 9-74208

• SEI: 95-216-11BK

• EMP: 26-00835 / E26-00835

• NAPA SME: 188382

• Aftermarket Mercury / Mariner 3.0L gearcase seal kits for 26-816575A4 applications

🚤 Compatibility

Commonly used on:

• Mercury / Mariner V6 3.0L lower-unit reseal service

• 200HP to 300HP EFI / DFI / OptiMax gear housings

• Gearcases with stainless water pump housing / late 3.0L service layout

• C-3 casting gearcase applications where listed

Typically suits:

• Engine models:

• Mercury 200HP - serial 0T801000 and up

• Mercury 200HP OptiMax DFI - serial 0G438000 and up

• Mercury 225HP EFI - serial 0G438000 and up

• Mercury 225HP OptiMax DFI - serial 0G590000 to 0G960499

• Mercury 250HP EFI - serial 0G438000 and up

• Mercury 200HP OptiMax DFI with C-3 casting gearcase - serial 0G386496 to 0G437999

• Mercury 225HP with C-3 casting gearcase - serial 0D280813 to 0G437999

• Mercury 225HP EFI with C-3 casting gearcase - serial 0G129222 to 0G437999

• Mercury 250HP EFI with C-3 casting gearcase - serial 0G129222 to 0G437999

• Mercury / Mariner V6 3.0L 200HP to 300HP gearcases, 1994-2006 service families where 26-816575A4 is specified

• Mercury 3.0L OptiMax / EFI / DFI Digital Saltwater gearcase applications where the lower-unit diagram lists 26-816575A4

• HP Range: commonly 200HP - 300HP where specified

• Engine Type: Mercury / Mariner V6 3.0L EFI / DFI / OptiMax outboard

• System Type: Lower-unit / gear housing seal kit

🔌 Function

The seal kit restores the gearcase sealing system to keep gear oil inside the lower unit and prevent water intrusion around the prop shaft, driveshaft, shift shaft and bearing carrier areas.

Common signs of failure:

• Milky or water-contaminated gear oil

• Gear oil leaking from prop shaft or driveshaft area

• Failed lower-unit pressure or vacuum test

• Fishing line damage behind propeller

• Gearcase disassembled for bearing or shaft service

• Complete reseal required after water intrusion

📦 Condition

• Genuine Quicksilver part

• Brand new

• Supplied in original or equivalent packaging