12171-ZY3-305 Honda Marine Washer | Genuine OEM Outboard Part

🔧 Product Description

Genuine Honda 22mm Oil Pipe Sealing Washer - Part Number: 12171-ZY3-305

New genuine Honda 22mm sealing washer used at the engine oil-pipe joint on later large-displacement Honda outboards. The soft sealing washer deforms under the specified tightening load to prevent engine-oil leakage from the oil-pipe connection.

⚙️ Key Features

• Genuine Honda 22mm sealing washer

• Designed for the oil-pipe joint or union

• Single-use crush/sealing component

• Maintains oil-system pressure and prevents external leakage

• Must be renewed whenever the oil-pipe joint is disturbed

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 12171-ZY3-305 (Honda OEM sealing-washer reference)

OEM / Related Numbers:

• 12171-ZY3-305

• 22mm sealing washer

Aftermarket / Verified Equivalents:

• No aftermarket equivalent

🚤 Compatibility

Commonly used on:

• Honda Marine four-stroke outboard engines

Typically suits:

• Engine models:

• BF200D

• BF225D

• BF250A/BF250D applications using the ZY3 oil-pipe joint

• BF350A applications using the same 22mm sealing washer

• HP Range: 200HP - 350HP

• Engine Type: Honda V6/V8 four-stroke outboard

• Year Range: Later engine families; confirm oil-pipe diagram and frame serial

🔌 Function

This precision-formed gasket seals the mating surfaces identified in the compatibility section. It prevents combustion gas, intake air, exhaust gas, cooling water, engine oil or fuel vapour from escaping or crossing between adjoining passages.

Common signs of failure:

• Oil weeps or drips from the oil-pipe union

• Washer is flattened, grooved or hardened

• Oil pipe has been removed or loosened

• Oil pressure drops because of an external leak

• Incorrect washer prevents the union from tightening correctly

📦 Condition

• Genuine Honda part

• Brand new

• Supplied in original or equivalent packaging