Zinc Trim Cylinder Anode MerCruiser Alpha One Gen II 806189Q1 MMS-1970
mms-1970
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Alpha One Gen II Trim-Cylinder Zinc Anode
Aftermarket Zinc Sacrificial Anode | Reference 806189Q1
Aftermarket zinc anode matching the MerCruiser 806189 trim-cylinder geometry. It installs at the trim-cylinder arm/rod position on compatible Alpha One Gen II drives and is not the gearcase trim-tab, bearing-carrier or gimbal-housing anode.
Key Features
- ✔ Sacrificial zinc corrosion protection
- ✔ Trim-cylinder arm / rod anode
- ✔ Aftermarket replacement geometry
- ✔ Designed to use the original mounting position
- ✔ Reference 806189Q1
Technical Specs
| Material | Zinc |
| Part type | Trim-cylinder arm / rod anode |
| Supply type | Aftermarket replacement |
| 4Boats SKU | MMS-1970 |
Compatibility / Fitment Guide
| Check | Compatible Application | Exclusion / Action |
|---|---|---|
| Drive family | MerCruiser Alpha One Gen II drives, introduced for 1991 model year, whose parts diagram specifies 806189-series trim-cylinder anodes. | Not for Alpha One Gen I, Bravo, OMC, Volvo Penta or an unspecified “Alpha” drive. |
| Mounting position | Trim-cylinder arm/rod anode position and matching original hardware/geometry. | Do not substitute for the trim tab or other anodes in the full drive kit. |
| Quantity | Compare the listing image and required drive quantity; Alpha One Gen II normally protects both trim-cylinder sides. | OEM service packs and aftermarket listings can contain different quantities—match the number supplied before ordering. |
| 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 / MerCruiser | 806189; 806189A1; 806189Q1; 97-806189; 97-806189Q1; 97-806189T1 |
| GLM | 12703 |
| 4Boats SKU | MMS-1970 |
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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