Description

The Yanmar 27210-200300 is a genuine OEM zinc anode screw used as an internal engine corrosion-protection part on select Yanmar marine diesel applications. It is a pencil-anode style zinc that threads into the engine or cooling-system location to help protect internal metal components from galvanic corrosion. Current references consistently describe this part as a 20 mm diameter x 30 mm zinc with M8 x 1.25 threads.

Because this is a zinc anode, it is intended for saltwater use. Internal anodes like this protect cooling passages and related metal components that are not easily visible during routine external inspection, making timely replacement important as part of regular service.

Key Features

• Genuine Yanmar OEM zinc anode screw
• OEM part number: 27210-200300
• Pencil-anode style internal corrosion-protection part
• Approx. dimensions: 20 mm diameter x 30 mm zinc length
• Thread size: M8 x 1.25
• Designed for internal engine / cooling-system sacrificial protection

Engine Compatibility
Current fitment references commonly associate 27210-200300 with select Yanmar marine diesel engines including 2GM, 2GM20, 3GM, 3GM30, 3HM, 3HM35, 2QM15, 2QM20, 3QM30, YSB8, YSB12, YSM8, and YSM12. Some current references also extend fitment to certain 6LY3-UTP / STP / ETP applications. Fitment should still be confirmed by engine model, serial number, and installed anode dimensions before ordering.

Serial Number Fitment Notice
Fitment should be verified using the Yanmar engine model and serial number, along with the installed anode’s thread size, zinc diameter, and zinc length. Matching by OEM part number 27210-200300 remains the safest method.

When This Part Needs Replacement
Replace this anode when the zinc is heavily consumed, pitted, shortened, or no longer able to provide proper sacrificial protection. Internal engine anodes are small service items, but they protect much more expensive cooling-system and engine components from corrosion damage.

Installation Notes
Install only where 27210-200300 is specified for the engine application. Confirm M8 x 1.25 thread size, zinc dimensions, and the existing installed anode before service. On engines using multiple internal anodes, each location should be checked individually during maintenance.

Alternate / Superseded Part Numbers when applicable

• 27210-200300
• CDZ 9-001
• 18-6201

Parts Desk Insight
Internal zinc anodes are easy to miss because they are hidden in the engine rather than mounted externally, but they are often some of the most important corrosion-protection parts on a raw-water-cooled diesel. Replacing a small internal zinc on schedule is far less expensive than repairing corrosion inside the cooling system later.

Shipping
Shipping: Ships same or next day for fast Canada wide shipping.