MG Duff 806188A2 / 806188A1 Mercury MerCruiser Bravo I Bearing Carrier Ring Anode

MG Duff CM806188 Mercury 806188A2 / 806188A1 MerCruiser Bravo I Bearing Carrier Ring Anode – Zinc / Aluminium

The MG Duff CM806188Z and CM806188A are sacrificial bearing carrier ring anodes designed for compatible MerCruiser Bravo I (Bravo 1) sterndrive installations. They are intended for the bearing carrier mounting position behind the propeller and correspond to Mercury original part numbers 806188A2 and 806188A1.

The series is available in two sacrificial materials: zinc (CM806188Z) and aluminium (CM806188A). These replacement anodes help protect electrically connected underwater metallic components of the propulsion system against galvanic corrosion.

Both variants measure 70 mm in outside diameter and 23 mm in height. The mounting arrangement consists of two fixing holes positioned on 74 mm centres, with a specified 4 mm stud size.

The zinc version weighs 0.15 kg (150 g), while the aluminium version weighs 0.06 kg (60 g).

Technical Specifications

Available Material Variants

Both material variants share the same specified outside diameter, height and mounting-hole arrangement. Their weights differ according to the sacrificial material.

MerCruiser Bravo I Compatibility

The MG Duff CM806188 series is specified in the detailed fitment information for:

• MerCruiser Bravo I (Bravo 1)
• Mercury OEM 806188A2
• Mercury OEM 806188A1

The anodes are intended for the bearing carrier location behind the propeller on compatible drive assemblies.

Some product descriptions also reference MerCruiser Alpha drives, but this additional compatibility has not been reconciled with the supplied Bravo I fitment information. Confirm the exact drive model and original equipment part number before ordering.

Bearing Carrier Ring Anode Dimensions

The CM806188 series features a ring-style sacrificial anode body with two mounting holes.

• Outside diameter: 70 mm
• Height: 23 mm
• Fixing holes: 2
• Fixing-hole centre distance: 74 mm
• Stud size: 4 mm

The 74 mm centre distance is a mounting measurement between the two fixing holes, not the outside diameter of the anode.

Before installation, compare the replacement anode with the original bearing carrier component and verify the fixing-hole alignment.

Zinc and Aluminium Sacrificial Corrosion Protection

The MG Duff CM806188 series is available in two materials:

• Zinc – CM806188Z: Weighs 0.15 kg and is commonly used for galvanic corrosion protection in saltwater marine environments.
• Aluminium – CM806188A: Weighs 0.06 kg and is used in suitable saltwater and certain brackish-water corrosion protection systems.

When correctly installed with suitable electrical continuity, the sacrificial anode material corrodes preferentially, helping reduce galvanic corrosion of electrically connected underwater metallic components.

Select the appropriate material according to the operating water conditions and Mercury / MerCruiser maintenance recommendations.

Inspection and Replacement

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

Before fitting a replacement:

• Confirm the MerCruiser drive model.
• Check Mercury OEM reference 806188A2 or 806188A1.
• Verify the 70 mm outside diameter and 23 mm height.
• Check the two fixing holes and 74 mm centre distance.
• Inspect the mounting surfaces and follow the applicable MerCruiser maintenance instructions.

Part Numbers and Cross-References

• MG Duff Zinc: CM806188Z
• MG Duff Aluminium: CM806188A
• Mercury OEM: 806188A2
• Mercury OEM: 806188A1
• Zinc Weight: 0.15 kg
• Aluminium Weight: 0.06 kg

Scope of Supply

1 × MG Duff MerCruiser Bearing Carrier Ring Anode in the selected material:

• CM806188Z – Zinc; or
• CM806188A – Aluminium.

Mounting hardware inclusion is not confirmed in the supplied product specifications.