18149-ZY3-A01 Honda Marine Exhaust Guide B Seal | Genuine OEM Outboard Part

🔧 Product Description

Genuine Honda Exhaust Guide B Seal - Part Number: 18149-ZY3-A01

New genuine Honda exhaust-guide B seal fitted in the mount-case/exhaust-guide assembly on large V6 outboards. It seals the exhaust passage where the powerhead and mount-case components meet.

⚙️ Key Features

• Genuine Honda exhaust-guide seal
• Position B seal for the ZY3 mount-case assembly
• Heat- and water-resistant moulded construction
• Prevents exhaust and cooling-water leakage
• Required during mount-case or powerhead removal

🚤 Compatibility

Commonly used on

• Honda Marine four-stroke outboard engines

Typically suits

• Engine models:
• BF200A/BF200D
• BF225A/BF225D
• BF250A/BF250D applications whose mount-case diagram specifies 18149-ZY3-A01
• HP Range: 200HP - 250HP
• Engine Type: Honda V6 four-stroke outboard
• Year Range: Mount-case and frame-serial dependent

🔌 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

• Exhaust gas or cooling water leaks around the mount case
• Abnormal exhaust noise appears beneath the powerhead
• Salt deposits or soot are visible around the guide joint
• Powerhead or exhaust guide has been removed
• Seal is heat-damaged, flattened or torn

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 18149-ZY3-A01 (Honda OEM exhaust-guide B seal reference)

OEM / Related Numbers

• 18149-ZY3-A01

Aftermarket / Verified Equivalents

• No aftermarket equivalent

📦 Condition

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