MG Duff 806105Q1 Mercury MerCruiser Alpha One Gen II Bearing Carrier Anode

MG Duff CM806105 Mercury 806105Q1 MerCruiser Alpha One Gen II Bearing Carrier Anode – Zinc / Aluminium / Magnesium

The MG Duff CM806105 series includes sacrificial bearing carrier anodes designed for compatible Mercury outboard and MerCruiser Alpha One Generation II sterndrive installations. The anodes are intended for the bearing carrier position behind the propeller and correspond to Mercury original part number 806105Q1.

Three material versions are available: zinc (CM806105Z), aluminium (CM806105A) and magnesium (CM806105M). These sacrificial anodes help protect electrically connected underwater metallic components against galvanic corrosion when correctly installed with suitable electrical continuity.

Each anode measures 85 mm in outside diameter and 24 mm in height. The mounting arrangement includes two fixing holes on 74 mm centres and a specified 4 mm stud size.

Technical Specifications

Available Variants

All three versions have the same specified dimensions and mounting configuration. The appropriate sacrificial anode material should be selected according to the vessel's operating water conditions and the propulsion equipment manufacturer's recommendations.

Mercury and MerCruiser Compatibility

The MG Duff CM806105 series is specified for compatible Mercury outboard and MerCruiser sterndrive applications using the bearing carrier anode corresponding to Mercury part number 806105Q1.

The supplied product information identifies MerCruiser Alpha One Generation II (Alpha 1 Gen 2) as the sterndrive application.

Before ordering, verify the original Mercury part number, drive generation and mounting arrangement. Compatibility with other Alpha One generations should not be assumed solely from the general Alpha One model name.

Bearing Carrier Construction and Dimensions

The anode is designed for installation at the bearing carrier location behind the propeller on a compatible propulsion assembly.

The manufacturer-supplied mounting specifications include:

• Outside diameter: 85 mm.
• Height: 24 mm.
• Number of fixing holes: 2.
• Fixing-hole centre distance: 74 mm.
• Stud size: 4 mm.

These measurements apply to the zinc, aluminium and magnesium variants. Before installation, compare the replacement anode with the original bearing carrier anode and verify the mounting-hole positions.

Zinc, Aluminium and Magnesium Corrosion Protection

The MG Duff CM806105 series is available in three sacrificial anode materials:

• Zinc – CM806105Z: Commonly used for galvanic corrosion protection in saltwater marine environments.
• Aluminium – CM806105A: Used in suitable marine corrosion protection systems, including saltwater and certain brackish-water conditions.
• Magnesium – CM806105M: Generally selected for freshwater corrosion protection systems.

When correctly installed with electrical continuity to the metallic components requiring protection, the sacrificial material corrodes preferentially, helping reduce galvanic corrosion of the connected underwater components.

The appropriate material should be selected according to the operating water conditions and the recommendations of the engine or sterndrive manufacturer.

Inspection and Replacement

Inspect the bearing carrier anode periodically as part of routine propeller and sterndrive maintenance. Replace it when the sacrificial material becomes significantly depleted, damaged or no longer securely attached.

During replacement, verify the mounting-hole alignment, 74 mm centre distance and the condition of the contact surfaces. Follow the relevant Mercury or MerCruiser installation instructions.

Part Numbers and Cross-References

• MG Duff Zinc: CM806105Z
• MG Duff Aluminium: CM806105A
• MG Duff Magnesium: CM806105M
• Mercury OEM: 806105Q1
• Zinc EAN: 0628309100896
• Aluminium EAN: 0628309115456
• Magnesium EAN: 0628309115081

Scope of Supply

1 × MG Duff Mercury / MerCruiser Bearing Carrier Anode in the selected material.