Mercury – Quicksilver 809666A02 Aluminum Anode Kit | Bravo III Drives | Prop Nut Assembly | 809666A02

Overview

Every boater knows that corrosion is the quiet enemy below the surface. The Quicksilver 809666A02 Aluminum Anode Kit is your first line of defense — a simple, reliable way to protect your MerCruiser Bravo III drive from galvanic corrosion that can eat away at metal components over time.

This OEM kit comes complete with a bronze prop nut and stainless-steel hex bolt, giving you everything you need for a clean, secure installation. It’s built for Bravo III drives with serial numbers 0M179451 and below and works in both freshwater and saltwater environments. Easy to inspect and simple to replace, it’s the kind of maintenance that saves you from expensive repairs down the line.

Key Features

• Purpose: Shields your Bravo III sterndrive from galvanic corrosion by sacrificing the anode instead of critical metal parts.
• Fitment: Designed for Bravo III drives (serial No. 0M179451 and below) and installs on the prop shaft assembly.
• Construction: Cast aluminum anode with bronze prop nut and stainless-steel hex bolt for strength and secure fit.
• Protection Rating: Meets or exceeds mil-spec MIL-A-24779 (SH) for dependable corrosion control in both salt and freshwater.
• Ease of Use: Simple to inspect and replace using standard hand tools — ideal for routine maintenance.

Engine & Boat Compatibility

• MerCruiser Bravo III sterndrives (serial No. 0M179451 and below)
• Applicable to a wide range of cruisers, sport boats, and twin-prop sterndrive setups

Performance & Practical Benefits

The 809666A02 Anode Kit does its job quietly but effectively. As electrolysis occurs, the aluminum anode takes the hit, corroding before the drive housing, prop nut, or shaft ever do. Because it meets military-grade specifications, it offers longer-lasting protection than standard zinc anodes — even in brackish or mixed water conditions.

Installation couldn’t be easier: remove the old anode, clean the contact surface, and bolt on the new one using the included hardware. Regular inspection lets you catch wear early, keeping your Bravo III drive protected and your boat performing at its best. It’s low-cost, high-value protection that every boater should stay on top of.

Why Buy OEM

With corrosion protection, materials matter. Mercury’s OEM aluminum anodes are cast to exact composition standards for predictable electrical activity — something aftermarket versions often miss. Using OEM means the anode will erode at the proper rate, providing balanced protection across your entire drive system.

Non-genuine parts might look similar, but slight differences in alloy or density can leave key components exposed. Mercury’s original equipment anodes are tested in both lab and real-world conditions, so you know you’re getting protection that lasts.

FAQ

Q1: Which drives use the Quicksilver 809666A02 kit?
A: It’s made for MerCruiser Bravo III sterndrives with serial numbers 0M179451 and below.

Q2: Can it be used in saltwater?
A: Yes — it’s approved for both freshwater and saltwater use, offering longer life than traditional zinc anodes.

Q3: What’s included in the kit?
A: One aluminum anode, one bronze prop nut, and one stainless-steel hex bolt.

Q4: How often should I replace the anode?
A: Inspect every few months and replace once you see pitting or heavy corrosion — typically once a season depending on use.

Q5: Why choose aluminum over zinc?
A: Aluminum lasts longer, works in more water types, and provides consistent protection without forming a hard oxide layer that can reduce performance.