Sierra 18-6114 Magnesium Anode, Replaces 806189A1, Fits MerCruiser Alpha One Gen II (1991 and Up)

The Sierra 18-6114 is a magnesium sacrificial anode built for MerCruiser stern drives, fitting Alpha One, Gen II applications from 1991 and up. Sacrificial anodes are a core part of a stern drive's corrosion protection system: the anode corrodes preferentially in place of the drive's aluminum and metal components, protecting the more expensive parts of the outdrive from galvanic corrosion. This anode is made of magnesium, which is formulated specifically for fresh water use; magnesium anodes are not intended for saltwater or brackish water service, where zinc or aluminum anodes are the correct choice instead.

The 18-6114 measures 0.39 x 0.39 x 0.39 inches and weighs 0.06 pounds, a compact size consistent with its role as a wear item that is replaced on a regular maintenance schedule as it sacrifices itself to corrosion. It is a direct cross-reference replacement for the Mercury Marine 806189A1, 97-806189, and 97-806189Q1 anodes used on Alpha One, Gen II drives (1991 and up), so boat owners can order it by either the Sierra number or the original Mercury numbers. Sierra parts are built to meet or exceed the original equipment part they replace, making this anode a straightforward like-for-like maintenance item for MerCruiser Alpha One Gen II owners running in fresh water.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-6114
• Material: Magnesium
• Water Application: Fresh water only
• Fitment: Alpha One, Gen II (1991 and up)
• Weight: 0.06 pounds
• Product Dimensions: 0.39 x 0.39 x 0.39 inches
• UPC: 808282103583
• OEM Cross Reference: 97-806189, 806189A1, 97-806189Q1

Fitment

• MerCruiser Alpha One, Gen II (1991 and up)

Replaces (OEM)

• 97-806189
• 806189A1
• 97-806189Q1

Frequently Asked Questions

What does the Sierra 18-6114 anode fit? The 18-6114 fits MerCruiser Alpha One, Gen II stern drives from 1991 and up.

Is the 18-6114 anode made of zinc or magnesium? It is made of magnesium, which is formulated for fresh water use rather than saltwater.

Can I use this magnesium anode in saltwater? No, magnesium anodes like the 18-6114 are intended for fresh water only; saltwater applications call for a zinc anode instead, and brackish or salt water environments call for an aluminum anode.

What OEM part numbers does the Sierra 18-6114 replace? It replaces Mercury Marine numbers 97-806189, 806189A1, and 97-806189Q1.

How much does the 18-6114 anode weigh? The Sierra 18-6114 anode weighs 0.06 pounds.

What are the dimensions of the 18-6114 anode? It measures 0.39 x 0.39 x 0.39 inches.

Is the Sierra 18-6114 a genuine equivalent to the Mercury Marine anode? Yes, the 18-6114 is built to meet or exceed the original equipment part it replaces, functioning as a direct equivalent to the Mercury Marine 806189A1 anode.

Why does a MerCruiser stern drive need an anode like the 18-6114? The anode sacrifices itself to galvanic corrosion in place of the more expensive metal components on the Alpha One, Gen II stern drive, which is why it is a wear item replaced periodically.

Does the 18-6114 work on Alpha One drives built before 1991? The 18-6114 is specified for Alpha One, Gen II drives from 1991 and up; earlier applications are not covered by this fitment.

What's the difference between the 18-6114 and an aluminum or zinc anode for the same drive? The 18-6114 is magnesium for fresh water use, while a zinc version is used in saltwater and an aluminum version is used in brackish or salt water environments; the correct material depends on where the boat operates.