Description

The CMT-3855411Z is a zinc transom (cavitation) plate anode designed specifically for Volvo Penta SX and DP-SM sterndrives. Mounted on the transom/gimbal plate assembly, it provides critical sacrificial protection against galvanic corrosion, preserving expensive drive components.

Manufactured from high-grade zinc alloy, this anode is optimized for saltwater environments, where zinc offers stable and predictable corrosion protection.

---

Key Features

• Direct replacement for Volvo Penta 3855411
• Designed for SX / DP-SM sterndrive transom plate
• Marine-grade zinc alloy construction
• Bolt-on plate design for full surface protection
• Protects gimbal housing and drive components
• OEM-spec fit and performance

---

Application / Compatibility

Fits Volvo Penta sterndrives including:

• SX series (SX-M, SX-C, SX-R, SX-MTD variants)
• DP-SM / DP-S / DP-SMTD series

Used on:

• Transom plate / cavitation plate assemblies
• Gimbal housing protection zones

Protects:

• Sterndrive housings
• Gimbal plate assemblies
• Adjacent underwater metals

Widely used across multiple SX and DP drive ratios and configurations.

---

Serial Number Fitment Notice

Always confirm:

• Drive model (SX / DP-SM variants)
• Mounting hole spacing (4.3–4.4″ center-to-center)
• Correct OEM reference (3855411)

Proper fitment is critical for full surface contact and protection.

---

When This Part Needs Replacement

• Anode is 50–70% consumed
• Uneven wear or pitting
• Loss of material thickness
• Routine seasonal service or haul-out

---

Installation Notes

• Install on clean, bare metal surface
• Ensure tight, even mounting
• Do not paint the anode
• Replace mounting hardware if corroded
• Inspect regularly in saltwater environments

---

Alternate / Superseded Part Numbers

• Volvo Penta: 3855411
• Camp Company: CMT-3855411Z
• Martyr: CM3855411Z
• OMC cross-reference: 3855411
• Aluminum version: CMT-3855411A
• Magnesium version available

---

Parts Desk Insight

This is one of the primary protection points on Volvo SX drives. If this anode is gone, corrosion starts attacking the gimbal plate and transom assembly quickly—both expensive repairs. Always replace this one on schedule, even if others still look okay.

---

Shipping

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