Volvo Penta SX Transom Plate Zinc Anode CMT-3855411Z
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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Alternate / Superseded Part Numbers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. ⚓
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.