91351-ZY3-003 Honda Marine O-Ring 105x3.1mm | Genuine OEM Outboard Part

🔧 Product Description

Genuine Honda Marine Propeller-Shaft O-Ring - Part Number: 91351-ZY3-003

Genuine Honda 105 × 3.1mm O-ring used to seal the propeller-shaft bearing carrier within selected large-horsepower Honda outboard gearcases. It helps retain lower-unit lubricant and prevents seawater entering the gearcase.

⚙️ Key Features

• Genuine Honda lower-unit sealing component
• Nominal dimensions: 105mm × 3.1mm
• Used around the propeller-shaft bearing-carrier assembly
• Compatible with Honda marine gear lubricant
• Recommended replacement during carrier or propeller-shaft servicing

🚤 Compatibility

Commonly used on

• Honda large-displacement outboard gearcases
• Propeller-shaft and bearing-carrier assemblies

Typically suits

• Engine models:
• Selected BF115A models
• BF135A family
• BF150A and BF150D families
• BF175A family
• BF200A family
• BF225A family
• HP Range: 115HP-225HP
• Engine Type: Inline-four and V6 four-stroke outboards
• Year Range: Approximately 2002 onward, depending on engine family and gearcase version
• Serial Note: Confirm using the complete model designation and frame serial before installation.

🔌 Function

The O-ring forms a static oil-and-water seal between the bearing carrier and the lower-unit housing.

⚠️ Common Signs of Failure

• Water-contaminated or emulsified gear oil
• Oil seepage around the bearing-carrier perimeter
• Failed lower-unit pressure test
• Corrosion or mineral deposits beneath the carrier
• Visible flattening, splitting or hardening of the seal

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 91351-ZY3-003 (current documented Honda reference)

OEM / Related Numbers

• 91351ZY3003
• Seal size reference: 105 × 3.1mm

Aftermarket / Verified Equivalents

• No aftermarket equivalent

📦 Condition

• Genuine Honda Marine part
• Brand new
• Supplied in original or equivalent protective packaging