Sierra 18-6067 Zinc Anode, Replaces 97-806189, for Mercruiser MR & Alpha One Drives

The Sierra 18-6067 is a zinc sacrificial anode engineered for saltwater applications on Mercruiser MR and Alpha One stern drives, including Alpha One Generation II units from 1991 and up. Sacrificial anodes protect the more valuable metal components of a stern drive from galvanic corrosion by corroding first, so replacing worn anodes on schedule is essential to protecting the drive unit, gimbal housing, and other submerged metal parts from electrolysis damage.

This anode is made from zinc, which is specifically suited for saltwater use. Sierra also notes that magnesium anodes are intended for fresh water only applications, while aluminum anodes are suited to brackish or salt water environments, so choosing the correct material for your operating water is important for effective corrosion protection. Every Sierra anode is engineered to meet or exceed the quality of the original equipment part it replaces, giving boat owners a reliable, direct-fit corrosion protection solution.

Regular inspection and replacement of anodes is a core part of stern drive maintenance. When an anode has corroded away by roughly half its original size, it should be replaced to maintain proper cathodic protection for the rest of the drive system.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-6067
• Product Type: Anode
• Material: Zinc
• Recommended Water Type: Saltwater only
• Weight: 0.21 pounds
• UPC: 030999976789

Fitment

• MR and Alpha One drives
• Alpha One, Generation II (1991 and up)

Replaces (OEM)

• 97-806189
• 806189A1
• 97-806189Q1

Frequently Asked Questions

What is the Sierra 18-6067 used for? The Sierra 18-6067 is a zinc sacrificial anode that protects Mercruiser MR and Alpha One stern drives from galvanic corrosion by corroding in place of the drive's metal components.

Is the 18-6067 anode made of zinc, magnesium, or aluminum? The 18-6067 is a zinc anode, which is intended for saltwater only applications.

Can I use the Sierra 18-6067 in fresh water? No. Zinc anodes such as the 18-6067 are for saltwater only; magnesium anodes are the correct choice for fresh water use.

What about brackish water? For brackish or salt water environments, an aluminum anode is the recommended material rather than the zinc 18-6067.

What drives does the 18-6067 anode fit? The 18-6067 fits Mercruiser MR and Alpha One drives, including Alpha One Generation II units from 1991 and up.

What OEM part numbers does the 18-6067 replace? The Sierra 18-6067 replaces OEM numbers 97-806189, 806189A1, and 97-806189Q1.

How much does the 18-6067 anode weigh? The 18-6067 anode weighs 0.21 pounds.

Is the Sierra 18-6067 an OEM part or an aftermarket replacement? The 18-6067 is a Sierra aftermarket anode engineered to meet or exceed the quality of the original equipment anode it replaces.

How do I know when to replace this anode? An anode like the 18-6067 should be replaced once it has corroded away by roughly half its original mass, since a badly depleted anode can no longer protect the drive's other metal components.

What is included when I order the 18-6067? Ordering the Sierra 18-6067 gets you one zinc anode sized for Mercruiser MR and Alpha One stern drives.