258537096 Mercury MerCruiser O-Ring | Genuine Quicksilver OEM Part

🔧 Product Description

Genuine Quicksilver Gear Housing Driveshaft O-Ring - Part Number: 25-8537096

A genuine Quicksilver O-ring used on Mercury / Mariner small outboard gear housing and driveshaft assemblies. This O-ring is used in the lower unit / gear housing service area on selected 8HP, 9.9HP, 15HP, 18HP, 20HP, 25HP, 25 Jet and 30HP engines where specified.

⚙️ Key Features

• Genuine Quicksilver OEM O-ring

• Correct Mercury part number 25-8537096

• Used in gear housing / driveshaft sealing applications

• Fits small Mercury / Mariner 2-stroke and 4-stroke outboards where specified

• Common service item during lower unit, driveshaft or gear housing reseal work

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 25-8537096 current OEM service reference

OEM / Related Numbers:

• 25-8537096

• 8537096

• 258537096

• 25-853709-6

• 853709 6

• Gear housing driveshaft O-ring

• Lower unit O-ring reference

• 27-16158010 related gasket in supported gear housing assemblies

• 47-8M0214912 related impeller reference in later water pump service family

• 46-8M0122064 related water pump repair kit family reference

Aftermarket / Verified Equivalents:

• Aftermarket O-ring equivalents exist, but final match must be made by serial-numbered gear housing diagram

🚤 Compatibility

Commonly used on:

• Mercury / Mariner small outboard gear housing and driveshaft assemblies

• Mercury / Mariner 8HP to 30HP lower-unit service

• Selected 25 Jet gear housing assemblies where 25-8537096 is specified

Typically suits:

• Engine models:

• Mercury 8HP 209cc 4-stroke - gear housing / driveshaft applications where 25-8537096 is specified

• Mercury 9.9HP 209cc 4-stroke - gear housing / driveshaft applications where 25-8537096 is specified

• Mercury 9.9HP / 15HP / 18HP 2-cylinder International 2-stroke gear housing applications

• Mercury 15HP carb 2-cylinder 4-stroke gear housing applications where specified

• Mercury 20HP small outboard gear housing applications where 25-8537096 is specified

• Mercury 25HP / 25 Jet / 30HP 2-cylinder 430cc International gear housing applications

• Mercury 25HP / 30HP 2-cylinder International gear housing applications

• Mercury 25 Jet EFI 3-cylinder 4-stroke gear housing applications where 25-8537096 is specified

• Mercury 30HP 2-cylinder International gear housing applications

• Mariner 8HP, 9.9HP, 15HP, 20HP, 25HP and 30HP gear housing assemblies where 25-8537096 is specified

• HP Range: commonly 8HP - 30HP and 25 Jet where specified

• Engine Type: Mercury / Mariner small outboard, 2-stroke and selected 4-stroke

• System Type: Gear housing / driveshaft O-ring

🔌 Function

The O-ring seals the specified gear housing or driveshaft joint to prevent water entry and gear oil leakage through the lower unit sealing area.

Common signs of failure:

• Milky or water-contaminated gear oil

• Lower-unit pressure test failure

• O-ring cut or flattened during service

• Oil seepage around gear housing / driveshaft area

• Lower unit reseal required after water intrusion

• Replacement required during gear housing rebuild

📦 Condition

• Genuine Quicksilver part

• Brand new

• Supplied in original or equivalent packaging