91356-SD4-952 Honda Marine O-Ring 31.5x2.4mm | Genuine OEM Outboard Part

🔧 Product Description

Genuine Honda Marine Thermostat and Exhaust-Manifold O-Ring - Part Number: 91356-SD4-952

Genuine Honda 31.5 × 2.4mm O-ring used in selected thermostat covers, exhaust manifolds and cooling-system joints. This ARAI-supplier version provides the seal required to contain pressurised cooling water within the engine.

⚙️ Key Features

• Genuine Honda Marine O-ring
• Nominal dimensions: 31.5mm × 2.4mm
• ARAI supplier-coded version
• Used in selected thermostat and exhaust-manifold assemblies
• Resistant to engine heat, coolant and saltwater exposure

🚤 Compatibility

Commonly used on

• Honda outboard thermostat housings
• Exhaust-manifold and cooling-water joints

Typically suits

• Engine models:
• BF75A family
• BF90A family
• BF115A family
• BF130A family
• BF175A family
• BF200A family
• BF225A family
• HP Range: 75HP-225HP
• Engine Type: Inline-four and V6 four-stroke outboards
• Year Range: Principal applications from approximately 1997 onward
• Serial Note: The installation position and supplier-coded seal may vary by engine serial and casting revision.

🔌 Function

The O-ring seals cooling-water passages around the thermostat cover or exhaust-manifold joint.

⚠️ Common Signs of Failure

• Cooling-water seepage around the housing
• Salt or corrosion deposits at the joint
• Loss of cooling-system pressure
• Localised overheating
• Hardened, flattened or pinched seal

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 91356-SD4-952 (documented Honda supplier-specific reference)

OEM / Related Numbers

• 91356SD4952
• 91356-SD4-953 — same nominal size with alternate NOK supplier designation
• Seal size reference: 31.5 × 2.4mm

Aftermarket / Verified Equivalents

• No aftermarket equivalent

📦 Condition

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