Zinc Gearcase Anode Mercury Mariner 823913Q 2.5-40HP MMS-1640
mms-1640
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823913Q-Pattern Gearcase Zinc Anode
Aftermarket Zinc Sacrificial Anode | Reference 823913Q
Aftermarket zinc round gearcase anode matching Mercury reference 823913Q. It fits defined small-outboard and Japanese-built Mercury/Mariner families; the 6-40hp statement applies only to specified Japanese-origin two-strokes, not to every engine in that horsepower range.
Key Features
- ✔ Sacrificial zinc corrosion protection
- ✔ Round gearcase button anode
- ✔ Aftermarket replacement geometry
- ✔ Designed to use the original mounting position
- ✔ Reference 823913Q
Technical Specs
| Material | Zinc |
| Part type | Round gearcase button anode |
| Supply type | Aftermarket replacement |
| 4Boats SKU | MMS-1640 |
Compatibility / Fitment Guide
| Check | Compatible Application | Exclusion / Action |
|---|---|---|
| 2-stroke small outboards | Mercury/Mariner 2.5, 3 and 3.3hp two-strokes, model year 1990 and newer, where the diagram specifies 823913Q. | Do not apply the year rule to unrelated 4-stroke gearcases. |
| FourStroke | F2.5 and F3.5, model year 2006 and newer, when the serial-number parts list calls for 823913Q. | Production changes can alter the anode; verify the serial number. |
| Japanese-built 2-strokes | 6-40hp Mercury/Mariner two-strokes of Japanese origin, serial 0N000001 and above, with this anode reference. | Not a blanket fit for US/Belgian-built 6-40hp engines or all Tohatsu-derived models. |
| Physical match | Casting profile, mounting hole, seating face and clearance match the removed anode and parts diagram. | Do not order by horsepower or appearance alone; production changes can use a different anode. |
| Electrical contact | Mounting faces are clean bare metal and fastener torque follows the service manual. | Never paint, grease or electrically isolate the anode from the protected casting. |
| Alloy / water | Zinc is selected as part of a consistent anode system suitable for the vessel's operating water. | For freshwater or mixed-water use, confirm whether the manufacturer specifies aluminium or magnesium instead. |
Part Number Cross Reference
| Mercury / Quicksilver reference | 823913Q; 97-823913Q |
| 4Boats SKU | MMS-1640 |
Cross-reference numbers identify fitment geometry. This product is aftermarket zinc and is not supplied as a genuine Mercury/Quicksilver part.
Frequently Asked Questions
Is this a genuine Mercury/Quicksilver anode?
No. It is an aftermarket zinc replacement.
Can I paint the anode?
No. Paint or sealant prevents the electrical contact and exposed surface needed for sacrificial protection.
When should it be replaced?
Inspect frequently and replace when materially wasted, cracked, loose or at the interval in the engine/drive maintenance schedule—commonly before about half the original mass is lost.
Does matching the number guarantee fit?
It is the primary check, but also compare the mounting position, dimensions, casting profile and your exact serial-number parts diagram.
Installation note: Remove corrosion from the contact face, install metal-to-metal, torque correctly and verify bonding continuity. Never use an anode as a lifting or jacking point.
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