Mercury – Quicksilver 821631Q1 Aluminum Gimbal Housing Anode | MerCruiser R, MR, Alpha One Gen II, Bravo, X, XR & XZ Drives | 821631Q1

Overview

Corrosion is the silent killer of sterndrives, but you can stay ahead of it with the Quicksilver 821631Q1 Aluminum Gimbal Housing Anode. Cast from high-quality aluminum, this OEM anode fits perfectly at the base of the gimbal housing on MerCruiser R, MR, Alpha One Gen II, Bravo, X, XR, and XZ drives.

It’s designed to protect your drive from galvanic corrosion by sacrificing itself before expensive metal components start to deteriorate. With included hardware and easy installation using common tools, it’s a quick bit of maintenance that can save you from major repairs later.

Key Features

• Purpose: Protects your gimbal housing and sterndrive components from galvanic corrosion.
• Fitment: For MerCruiser R, MR, Alpha One Gen II, Bravo Series, X, XR, and XZ drives.
• Construction: Made from marine-grade aluminum for superior corrosion protection in both fresh and saltwater.
• Specifications: Meets or exceeds mil-spec MIL-A-24779(SH) for long-lasting, even corrosion control.
• Ease of Install: Includes installation hardware for simple, fast replacement — uses existing bolts.

Engine & Boat Compatibility

• Compatible with MerCruiser R, MR, Alpha One Gen II, Bravo Series, X, XR, and XZ drives
• Ideal for boats operated in either saltwater or freshwater environments

Performance & Practical Benefits

The 821631Q1 anode helps protect your MerCruiser sterndrive by diverting corrosion away from key metal surfaces like the gimbal housing and bearing carrier. As a sacrificial anode, it wears down gradually while shielding vital parts from electrochemical decay.

This aluminum alloy anode lasts longer than zinc options and performs equally well in both salt and freshwater. Installation takes just a few minutes — unbolt the old one, secure the new one using the supplied hardware, and you’re back to full protection.

Why Buy OEM

Mercury’s OEM anodes are cast from precise aluminum alloys that provide balanced protection across all metal surfaces. Aftermarket versions may use inconsistent materials that corrode unevenly or too quickly, leaving parts unprotected.

A genuine Quicksilver anode guarantees the right fit, the right composition, and dependable protection — tested by Mercury engineers to keep your sterndrive safe season after season.

FAQ

Q1: What drives fit the Quicksilver 821631Q1 anode?
A: It fits MerCruiser R, MR, Alpha One Gen II, Bravo, X, XR, and XZ drives.

Q2: Can it be used in saltwater?
A: Yes. The aluminum alloy offers excellent protection in both salt and freshwater.

Q3: Is hardware included?
A: Yes, some installation hardware is included, and existing bolts can be reused.

Q4: How often should I replace the anode?
A: Inspect it a few times each season and replace it once 50% of the material has worn away.

Q5: Why OEM instead of aftermarket?
A: OEM anodes use higher-quality alloys for balanced, longer-lasting protection that generic versions can’t match.