Martyr MerCruiser Alpha One Gen I Aluminum Anode Kit - ALU-A1KA
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The Martyr ALU-A1KA is an aluminum sacrificial anode kit for MerCruiser Alpha One Generation I sterndrives. This kit is designed to replace key factory anode locations on compatible Alpha One Gen I drives, helping protect the aluminum drive housing, gimbal area, trim tab location, and underwater hardware from galvanic corrosion.
The aluminum alloy construction is suited for boats operating in saltwater and brackish water, especially where an aluminum anode kit is preferred over traditional zinc. Always confirm your sterndrive generation and anode layout before ordering.
Key Features
- Martyr / Canada Metal aluminum anode kit.
- Part number: ALU-A1KA.
- Common cross-reference: CMALPHAKITA.
- Designed for MerCruiser Alpha One Gen I sterndrives.
- Typical application range: 1983–1990 Alpha One Generation I drives.
- Aluminum alloy sacrificial protection for saltwater and brackish-water use.
- Helps protect expensive aluminum drive castings from galvanic corrosion.
- Replaces the common factory-style Gen I anode locations.
- Includes installation hardware where supplied with the kit.
- Cadmium-free aluminum formulation compared with legacy zinc-style anodes.
Kit Contents
Typical Alpha One Gen I aluminum kit layout includes:
- Gimbal housing block anode — mounts under the gimbal housing / transom plate area.
- Trim tab anode — mounts above the propeller and also functions as the steering trim tab where equipped.
- Mounting hardware — required bolts/fasteners where included with the kit.
Confirm the exact kit contents against the package and your existing drive layout before installation. Some drives may have been modified, updated, or previously fitted with non-original anode hardware.
Drive Compatibility
Common application context includes:
- MerCruiser Alpha One Generation I sterndrives.
- Typical Alpha One Gen I production range: 1983–1990.
- Saltwater or brackish-water boats requiring aluminum sacrificial protection.
- Drives using the matching gimbal housing block and trim tab anode configuration.
This kit is not for Alpha One Gen II, Bravo, Blackhawk, outboard, or non-MerCruiser drive applications unless the parts diagram confirms the same anode layout.
Fitment Notice
Confirm fitment by sterndrive serial number, drive generation, anode shape, trim tab style, mounting-hole pattern, and water type before ordering. Alpha One Gen I and Alpha One Gen II anode kits are not the same. If your boat has a 1991 or newer Alpha One Gen II drive, verify the Gen II kit instead.
Use aluminum anodes for saltwater and brackish-water service where this material is specified or preferred. For freshwater-only operation, magnesium is commonly used instead. Correct anode material is important for proper corrosion protection.
When This Kit Needs Replacement
Replace anodes when they are heavily pitted, loose, missing, damaged, scaled over, or approximately half consumed. Anodes should be inspected during spring commissioning, fall haul-out, winterization, gear lube service, propeller service, and any time paint bubbling, white powdering, or corrosion appears on the drive.
Do not wait until an anode is completely gone. Once the sacrificial metal is consumed, the sterndrive housing and underwater hardware become more exposed to corrosion.
Installation Notes
Remove the old anodes and clean each mounting surface down to bare metal before installing the new kit. Sacrificial anodes must have direct metal-to-metal contact with the drive to work properly. Paint, corrosion, marine growth, sealant, or heavy scale under the anode can insulate it and reduce protection.
Do not paint anodes. Antifouling paint, primer, clear coat, or other coatings over the anode surface prevent the water from contacting the sacrificial metal. Tighten all hardware securely and inspect bonding continuity where applicable.
After installation, recheck the anodes once the boat has been back in the water, especially if the vessel is kept in a marina with shore power, nearby steel structures, or known stray-current concerns.
Alternate/Cross-Reference Part Numbers
- ALU-A1KA — aluminum anode kit part number
- CMALPHAKITA — Martyr / Canada Metal aluminum kit reference
- Alpha 1 Kit ALU-A1KA — common listing format
- Alpha One Gen I Aluminum Anode Kit — application reference
Parts Desk Insight
The most important check is confirming the drive generation. Alpha One Gen I and Alpha One Gen II kits look similar in purpose but do not use the same anode layout. For best protection, match the kit to the drive, use the correct anode material for your water, clean every mounting surface to bare metal, and never paint the anodes.
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.