MG Duff 3855411 Volvo Penta SX Drive Forward Cavitation Plate Anode

MG Duff CM3855411 Volvo Penta 3855411 SX Drive Forward Cavitation Plate Anode – Zinc / Aluminium

The MG Duff CM3855411Z and CM3855411A are sacrificial forward cavitation plate / transom plate anodes designed for compatible Volvo Penta SX Drive sterndrives. Both variants correspond to Volvo Penta original part number 3855411.

These replacement anodes provide sacrificial galvanic corrosion protection for electrically connected underwater metallic components of the SX sterndrive assembly. The series is available in zinc (CM3855411Z) and aluminium (CM3855411A).

Both versions measure 145 mm in length, 103 mm in width and 37 mm in height. They feature two fixing holes spaced 113 mm between centres and a specified 1/4-20 UNC stud thread.

The zinc version weighs 1.04 kg, while the aluminium version weighs 0.41 kg.

Technical Specifications

Available Material Variants

Both variants share the same specified dimensions and mounting configuration. The sacrificial material and weight differ between the two versions.

Volvo Penta SX Drive Compatibility

The MG Duff CM3855411 series is designed for compatible Volvo Penta SX Drive installations requiring a forward cavitation plate / transom plate anode corresponding to Volvo Penta OEM 3855411.

• Drive Manufacturer: Volvo Penta
• Drive Series: SX
• Application: Forward Cavitation Plate / Transom Plate
• Original Part Number: 3855411

Specific SX variants, production years and serial number ranges have not been supplied. Confirm compatibility against the original Volvo Penta part number and mounting configuration before ordering.

Anode Dimensions and Mounting

The CM3855411 series features a plate-shaped sacrificial anode body with the following measurements:

• Length: 145 mm
• Width: 103 mm
• Height: 37 mm
• Number of fixing holes: 2
• Fixing-hole centre distance: 113 mm
• Stud thread: 1/4-20 UNC

The 113 mm measurement refers to the distance between the centres of the two fixing holes.

The 1/4-20 UNC specification identifies an imperial thread with a nominal diameter of 1/4 inch and 20 threads per inch. Verify the original mounting hardware before installation.

Zinc and Aluminium Sacrificial Corrosion Protection

The MG Duff CM3855411 series is available in two sacrificial anode materials:

• Zinc – CM3855411Z: Weighs 1.04 kg and is intended for galvanic corrosion protection in saltwater marine environments.
• Aluminium – CM3855411A: Weighs 0.41 kg and is suitable for appropriate saltwater and brackish-water corrosion protection systems.

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

Select the appropriate material according to operating water conditions and Volvo Penta's corrosion protection recommendations.

Inspection and Replacement

Inspect the cavitation plate / transom plate anode periodically during routine Volvo Penta SX Drive maintenance. Replace it when the sacrificial material becomes significantly depleted, damaged or no longer securely attached.

Before fitting a replacement:

• Confirm the Volvo Penta SX Drive application.
• Verify original Volvo Penta part number 3855411.
• Check the 145 × 103 × 37 mm dimensions.
• Confirm the two fixing holes and 113 mm centre distance.
• Verify the 1/4-20 UNC mounting thread specification.
• Inspect the mounting surfaces and follow the applicable Volvo Penta installation instructions.

Part Numbers and Cross-References

• MG Duff Zinc: CM3855411Z
• MG Duff Aluminium: CM3855411A
• Volvo Penta OEM: 3855411
• Zinc Weight: 1.04 kg
• Aluminium Weight: 0.41 kg

Scope of Supply

1 × MG Duff Volvo Penta SX Drive Forward Cavitation Plate / Transom Plate Anode in the selected material:

• CM3855411Z – Zinc; or
• CM3855411A – Aluminium.

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