MG Duff 872139 Volvo Penta DPX Sterndrive Bar Anode

MG Duff CM872139Z / CM872139A Volvo Penta 872139 DPX Sterndrive Bar Anode – Zinc / Aluminium

The MG Duff CM872139Z and CM872139A are sacrificial bar anodes designed for compatible Volvo Penta DPX sterndrives. Both variants correspond to Volvo Penta original part number 872139 and provide replaceable corrosion protection for electrically connected underwater metallic components of the sterndrive assembly.

The anodes are available in two materials: zinc (CM872139Z) and aluminium (CM872139A). Both versions share the same bar-shaped construction and mounting dimensions.

The anode measures 136 mm in length, 46 mm in width and 26 mm in height. Its mounting arrangement includes two fixing holes on 86 mm centres, with a specified 8 mm stud size.

Technical Specifications

Available Variants

Both variants correspond to Volvo Penta OEM reference 872139 and have the same specified mounting dimensions. The appropriate material should be selected according to the vessel's operating conditions and the requirements of the corrosion protection system.

Volvo Penta DPX Compatibility

The MG Duff CM872139 series is specified for the following Volvo Penta sterndrive models:

• Volvo Penta DPX
• Volvo Penta DPX-C
• Volvo Penta DPX-R
• Volvo Penta DPX-S
• Volvo Penta DPX-A

The manufacturer reference Volvo Penta 872139 can be used to help identify the correct replacement anode.

Before ordering, verify the original component's dimensions, fixing-hole positions and compatibility with the specific DPX drive configuration.

Bar Anode Construction and Mounting Dimensions

The anode features a bar-shaped body with two mounting holes intended for attachment to the compatible sterndrive assembly.

• Overall length: 136 mm.
• Overall width: 46 mm.
• Overall height: 26 mm.
• Number of fixing holes: 2.
• Fixing-hole centre distance: 86 mm.
• Stud size: 8 mm.

Both material variants share the specified dimensions and mounting arrangement. The supplied information does not confirm whether mounting fasteners are included.

Zinc and Aluminium Sacrificial Corrosion Protection

The MG Duff CM872139 series provides a choice of two sacrificial anode materials for compatible Volvo Penta DPX sterndrives.

• Zinc – CM872139Z: Commonly used in saltwater marine corrosion protection systems.
• Aluminium – CM872139A: Used in suitable marine corrosion protection systems, including saltwater and certain brackish-water environments.

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

The correct material should be selected according to the operating water conditions and the equipment manufacturer's recommendations.

Inspection and Replacement

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

Before fitting the replacement, check the two fixing-hole positions, the 86 mm centre distance and the condition of the mounting surfaces.

Follow the applicable Volvo Penta installation instructions and ensure suitable electrical contact between the anode and the components requiring corrosion protection.

Part Numbers and Cross-References

• MG Duff Zinc: CM872139Z
• MG Duff Aluminium: CM872139A
• Volvo Penta OEM: 872139
• Zinc EAN: 0628309113667
• Aluminium EAN: 0628309123314

Scope of Supply

1 × MG Duff Volvo Penta DPX Sterndrive Bar Anode in the selected material:

• CM872139Z – Zinc; or
• CM872139A – Aluminium.