19291-ZY3-000 Honda Relief Valve Cover | Genuine Used Part

🔧 Product Description

Genuine Honda Left Relief Valve Cover - Part Number: 19297-ZY3-000

A genuine Honda left-hand cooling-system relief valve cover for selected BF175, BF200, BF225, BF250 and BF350 V6 outboards.

The inventory number 19291-ZY3-000 does not match Honda's service listing for the photographed cover. The component shown matches Honda part number 19297-ZY3-000, the left relief valve cover used on the mount-case cooling-water pressure relief assembly.

⚙️ Key Features

• Genuine Honda OEM left relief valve cover
• Correct service part number 19297-ZY3-000
• Three-point mounting design with metal thread inserts
• Houses the left cooling-water pressure relief valve and spring
• Used across selected Honda 175HP to 350HP V6 four-stroke outboards

🚤 Compatibility

Commonly used on

• Honda V6 outboard mount-case cooling systems
• Left-hand pressure relief valve and poppet-valve assemblies

Typically suits

• Engine models:
• Honda BF175A / BF175AK1
• Honda BF175D
• Honda BF200A / BF200A2 / BF200A3 / BF200A5 / BF200A6 / BF200AK1
• Honda BF200D / BF200DK1
• Honda BF225A / BF225A2 / BF225A3 / BF225A5 / BF225A6 / BF225AK1
• Honda BF225D / BF225DK1
• Honda BF250A
• Honda BF250D / BF250DK1
• Honda BF350A
• BF175AK1 XCA - frame serial BAKJ-1300001 to BAKJ-9999999
• BF225A2 LA - frame serial BAGJ-1000001 to BAGJ-1099999
• BF225A6 XCA - frame serial BAHJ-1400001 to BAHJ-1499999
• BF225AK1 XCA - frame serial BAHJ-1600001 to BAHJ-9999999
• BF225D LRA - frame serial BBPJ-1000001 and above
• BF225D XCDA - frame serial BBPJ-8000001 and above
• HP Range: 175HP - 350HP
• Engine Type: Honda SOHC V6 EFI four-stroke outboard
• Year Range: Approximately 2002 onward, dependent on engine model and frame serial number

🔌 Function

The cover encloses the left cooling-water pressure relief valve, spring and sealing components within the mount case. The relief valve opens as cooling-system pressure rises, allowing controlled water bypass while the cover contains and seals the assembly.

⚠️ Common Signs of Failure

• Cooling water leaking around the cover
• Cracked or heat-damaged cover body
• Warped sealing face
• Damaged metal thread inserts
• Corrosion around the mounting holes
• Damaged gasket groove preventing correct sealing

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 19297-ZY3-000 current Honda left relief valve cover reference

OEM / Related Numbers

• 19297-ZY3-000
• 19291-ZY3-000 inventory reference
• 19295-ZY3-000 right relief valve cover
• 19291-ZW5-000 relief valve
• 19292-ZW5-000 relief valve spring
• 19296-ZY3-000 relief valve cover gasket
• 19297-ZW5-000 relief valve packing
• 19298-ZY3-000ZB left relief valve spacer

Aftermarket / Verified Equivalents

• No aftermarket equivalent

📦 Condition

• Genuine used part
• Removed from running engine where applicable
• In good working condition unless otherwise stated