Description

The Yanmar 120650-13420 is a genuine OEM sacrificial anode designed for Yanmar marine diesel engines, providing cathodic protection for internal cooling passages, heat exchangers, oil coolers, and engine block components against galvanic corrosion in saltwater and freshwater environments.

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Key Features

• Genuine Yanmar OEM part — exact fit and alloy specification
• Protects heat exchangers, oil coolers, and cooling passages
• Sacrifices itself to prevent corrosion of expensive engine components
• Suitable for saltwater and freshwater operation
• Easy inspection and replacement during routine service

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Engine Compatibility

Designed for Yanmar marine diesel engines. Always verify compatibility using your engine serial number and Yanmar parts diagram.

Installed in:

• Heat exchangers
• Engine block cooling ports
• Oil cooler passages

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Serial Number Fitment Notice

• Confirm part number 120650-13420 against your engine serial number
• Verify thread size and anode length before ordering
• Consult Yanmar parts diagram for your specific model

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When This Part Needs Replacement

• Anode is 50% or more consumed
• Excessive scaling, buildup, or discoloration
• Reduced cooling efficiency or overheating symptoms
• Every 100 operating hours or annually — more frequently in saltwater

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Installation Notes

• Clean mounting threads and surface before installation
• Ensure bare metal-to-metal contact — no paint or coatings on mounting surface
• Do not use thread sealant that could insulate the anode
• Torque to Yanmar specification — do not over-tighten
• Replace before full depletion to prevent debris in cooling system

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Alternate / Cross-Reference Part Numbers

• Yanmar OEM: 120650-13420

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Parts Desk Insight

This anode is a different size/position than the 120650-18530 — Yanmar engines often use multiple anodes in different cooling circuit locations. Always verify the correct part number for each position using your engine’s parts diagram. Keeping a spare on board is good practice for saltwater operators.

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Shipping

Ships in 1–3 business days for fast Canada wide shipping.