Sierra Zinc Anode 18-6012, OEM 34127 Cross Reference for Mercury Marine Engines

The Sierra 18-6012 is a zinc sacrificial anode built for Mercury Marine engines to guard against galvanic corrosion in and around raw water and lower-unit components. Zinc anodes work by corroding in place of surrounding metal parts, protecting more expensive engine and drive components from electrolytic damage caused by dissimilar metals in a marine electrical environment. Regular anode replacement is one of the most cost-effective forms of preventive maintenance a boat owner can perform, and using the correct part number for your Mercury Marine engine ensures proper fit and full sacrificial protection.

This anode is manufactured from zinc and is sized at 0.39 x 0.39 x 0.39 inches, a compact fitment that corresponds to the OEM location it replaces. It carries the Sierra part number 18-6012 and cross-references to OEM number 34127 for Mercury Marine applications. As with all sacrificial anodes, it should be inspected periodically and replaced once roughly half of its original material has corroded away, since a depleted anode can no longer adequately protect the metal components around it.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-6012
• Product Type: Zinc Anode
• Material: Zinc
• Weight: 1.33 pounds
• Product Dimensions: 0.39 x 0.39 x 0.39 inches
• UPC: 030999320216
• OEM Cross Reference: 34127
• Fitment: Mercury Marine

Fitment

• Mercury Marine

Replaces (OEM)

• 34127

Frequently Asked Questions

What does the Sierra 18-6012 zinc anode fit? The Sierra 18-6012 is designed for Mercury Marine engines and cross-references to OEM part number 34127.

What OEM part number does this anode replace? It replaces OEM number 34127 on applicable Mercury Marine engines.

What material is the 18-6012 anode made from? It is made from zinc, the standard sacrificial metal used for galvanic corrosion protection in marine applications.

How big is the Sierra 18-6012 anode? It measures 0.39 x 0.39 x 0.39 inches, a compact size matched to its OEM mounting location.

How much does the 18-6012 anode weigh? This zinc anode weighs 1.33 pounds.

Why do Mercury Marine engines need a zinc anode? Zinc anodes corrode in place of surrounding metal engine and drive components, preventing galvanic corrosion caused by dissimilar metals in a marine environment; the 18-6012 serves this role on Mercury Marine engines.

When should the 18-6012 zinc anode be replaced? A sacrificial anode like the 18-6012 should be replaced once it has corroded away to roughly half its original size, since a depleted anode no longer offers full protection.

Is the Sierra 18-6012 a genuine OEM part or an aftermarket replacement? The 18-6012 is a Sierra-branded replacement anode that cross-references to Mercury Marine OEM number 34127.

What is included when I order part 18-6012? You receive one Sierra 18-6012 zinc anode.

Does the 18-6012 anode require any special tools to install? Anode replacement on Mercury Marine engines is typically a basic hand-tool job, though specific torque or sealant steps should follow your engine's service procedure.

Is the Sierra 18-6012 the same as OEM 34127? Yes, Sierra part 18-6012 cross-references directly to Mercury Marine OEM number 34127.