Martyr MerCruiser Alpha I Gen I Anode Kit – Magnesium | Freshwater (CMALPHAGEN1KITM)
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Martyr MerCruiser Alpha I Gen I Anode Kit – Magnesium | Freshwater (CMALPHAGEN1KITM)
The Martyr CMALPHAGEN1KITM is a complete magnesium anode kit designed to replace all sacrificial anodes on MerCruiser Alpha I Generation I stern drives used in freshwater environments. The kit covers the trim tab and gimbal housing positions, providing comprehensive galvanic corrosion protection across the drive.
Magnesium is the correct anode material for freshwater use — it is more electrochemically active than aluminum or zinc in low-conductivity freshwater, providing effective galvanic protection where other anode materials may be too passive. Martyr Anodes are manufactured to OEM-equivalent specifications, making this a trusted replacement for the factory anodes.
Kit Contents
- CM31640 — Trim Tab Anode (x1)
- CM55989 — Gimbal Housing Anode (x2)
- CM821631 — Gimbal Housing Anode (x1)
Key Features
- Magnesium construction — correct material for freshwater use
- Complete kit covers all anode positions on the Alpha I Gen I drive
- OEM-quality Martyr Anodes construction
- Replaces all factory anodes in a single purchase
Compatible Applications
- MerCruiser Alpha I Generation I stern drives — freshwater use
- Lakes, rivers, and other freshwater environments
- Covers trim tab and gimbal housing anode positions
Parts Desk Insights
This complete magnesium kit is the right choice for MerCruiser Alpha I Gen I owners who operate in freshwater lakes and rivers and want to replace all anodes at once during annual maintenance or haulout. Magnesium is essential for freshwater use; aluminum or zinc anodes in freshwater may not corrode fast enough to provide adequate galvanic protection, leaving the drive underprotected. For the saltwater and brackish water version of this kit, see the aluminum version: Martyr MerCruiser Alpha I Gen I Anode Kit, Aluminum. For the Gen II version, see the MerCruiser Alpha I Generation II Anode Kit, Aluminum and Magnesium. For alternate Gen I kits, see the Martyr MerCruiser Alpha One Gen I Aluminum Anode Kit (ALU-A1KA) and the Seachoice Anode Kit – MerCruiser Alpha One Gen I (1984–1990), Aluminum.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 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.