Description

The Martyr Aluminum Anode Bar CMT-852835A is a replacement transom / bar-style sacrificial anode for Volvo Penta 290 Series sterndrive applications. Built from aluminum alloy for marine corrosion protection, this anode helps protect underwater drive components by sacrificing itself before more critical metal parts are damaged.

Key Features

• Martyr aluminum anode bar
• Part number: CMT-852835A
• Common Martyr reference: CM852835A
• Volvo Penta replacement reference: 852835 / 852835A
• Application: Volvo Penta 290 Series sterndrive / Duo Prop anode
• Material: Aluminum
• Length: 5.35″ / 136 mm
• Width: 1.81″ / 46 mm
• Height: 1″ / 26 mm
• Mounting hole centre distance: 3.4″ / 86 mm
• Hole diameter: 0.33″ / 9 mm
• Approximate weight: 0.64 lb / 0.29 kg
• Designed for corrosion protection in salt, brackish, and freshwater applications

Application Compatibility

Commonly associated with Volvo Penta 290 Series sterndrive and Duo Prop applications, including 290, A, A-DP, B, D, DP, DP-A, DP-A1, DP-A2, DP-B, DP-B1, DP-C, DP-C1, DP-D, DP-D1, DP-D2, DP-E, DP-G, SP, SP-A, SP-A1, SP-A2, SP-C, and SP-E style references.

Fitment Notice

Anode fitment should always be confirmed by drive model, anode location, and original part number. Matching the old anode’s shape, hole spacing, and mounting style is important before installation. Do not paint anodes, as paint blocks the metal contact needed for proper sacrificial corrosion protection.

When This Part Needs Replacement

Replace the anode when it is heavily wasted, loose, cracked, missing, painted over, or reduced to roughly half of its original size. Anodes should be inspected regularly during the boating season, especially in marinas, saltwater, brackish water, or areas with stray-current activity.

Installation Notes

Remove the old anode and clean the mounting surface so the new anode makes good metal-to-metal contact. Install using the correct fasteners for the drive, tighten securely, and leave the anode bare. Recheck after launch or during routine service to confirm it is secure and wearing normally.

Alternate/Superseded Part Numbers

Related references include:

• CMT-852835A
• CM852835A
• 852835
• 852835A
• Camp 852835AL
• Tecnoseal 00708AL
• CM852835M — magnesium version
• CM852835Z — zinc version

Parts Desk Insight

For anodes, shape and mounting pattern matter just as much as the part number. This bar anode uses the 86 mm / 3.4″ centre spacing, so comparing that to the anode coming off the drive is a quick way to avoid ordering the wrong location or style.

Shipping: Ships same or next day for fast Canada wide shipping.