Zinc Anode Rod Set – Fits Volvo Penta D4-D6, TAMD Series (Replaces 838929, 804107, 800476)
Zinc Anode Rod Set – Fits Volvo Penta D4-D6, TAMD Series (Replaces 838929, 804107, 800476) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Zinc Anode Rod Set – Fits Volvo Penta D4-D6, TAMD Series (Replaces ...
Product Details
This Zinc Anode Rod Set – Fits Volvo Penta D4-D6 and TAMD Series serves as a sacrificial cathodic protection device for a wide range of Volvo Penta marine diesel engines, including the D4, D6, D9, D11, and various TAMD models. Used primarily in raw water cooling systems, it protects critical metal components from galvanic corrosion in saltwater environments.
This set is a direct replacement for Volvo Penta part numbers 838929, 804107, 800476, 858501, and 3838499. It also interchanges with aftermarket equivalents including Sierra 18-6001, GLM 12789, CMP CM838929Z, and Tecnoseal 00714.
- Installation Method: Threaded with 7/16" UNC external and M8 internal threads.
- Operating Environment: Made from high-grade zinc for use in saltwater.
- Function: Provides essential sacrificial cathodic protection to prevent engine corrosion.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket brands.
| Brand | Part Number |
|---|---|
| Volvo Penta | 838929 |
| Volvo Penta | 804107 |
| Volvo Penta | 800476 |
| Volvo Penta | 858501 |
| Volvo Penta | 3838499 |
| Sierra | 18-6001 |
| GLM | 12789 |
| CMP | CM838929Z |
| Tecnoseal | 00714 |
Engine & Model Compatibility
Confirm your engine model and year in the table below.
This component is designed for a broad range of Volvo Penta marine diesel engines.
| Brand | Model | OEM Part No. |
|---|---|---|
| Volvo Penta | MD40A | 838929 |
| Volvo Penta | TMD40 A/B/C | 838929 |
| Volvo Penta | D4 Series | 838929 |
| Volvo Penta | D6 Series | 838929 |
| Volvo Penta | D9 Series | 838929 |
| Volvo Penta | D11 Series | 838929 |
| Volvo Penta | TAMD60 | 838929 |
| Volvo Penta | TAMD63 | 838929 |
| Volvo Penta | TAMD70 | 838929 |
| Volvo Penta | TAMD74 | 838929 |
| Volvo Penta | TAMD75 | 838929 |
| Volvo Penta | TAMD103 | 838929 |
| Volvo Penta | TAMD122A | 838929 |
| Volvo Penta | TAMD122P | 838929 |
| Volvo Penta | D12C | 838929 |
| Volvo Penta | TAMD162C | 838929 |
| Volvo Penta | TAMD163A-A | 838929 |
| Volvo Penta | TAMD163P-A | 838929 |
| Volvo Penta | 2001 Series | 838929 |
| Volvo Penta | 2002 Series | 838929 |
| Volvo Penta | 2003 Series | 838929 |
Technical Specs
- Product Type
- Zinc Pencil Anode
- Installation
- Threaded
- Material
- Zinc (for use in saltwater)
- Function
- Sacrificial Cathodic Protection
- Housing Material
- Zinc
- Dimensions
- Length: 44.45 mm (1-3/4"), Diameter: 14.29 mm (9/16")
- External Thread
- 7/16" UNC
- Internal Thread
- M8
- Weight
- 0.045 kg (0.10 lbs)
What’s in the Box
- 5 x Zinc Pencil Anode (Replaces 838929)
Installation Notes
- Turn off the engine and close the relevant seacock to stop water flow.
- Locate and access the existing zinc anode on your engine's cooling system.
- Use an appropriate wrench to unscrew and remove the old, depleted anode plug.
- Clean the threads in the housing to ensure a clean, conductive connection.
- Apply a suitable thread sealant to the threads of the new anode plug.
- Screw the new anode in by hand until it is snug, then tighten gently with a wrench (typically a quarter-turn is sufficient). Do not overtighten.
- Re-open the seacock and start the engine.
- Carefully inspect the new anode plug for any signs of leaks.
Troubleshooting & FAQ
Which Volvo Penta engines does this anode fit?
This anode fits a broad range of Volvo Penta engines, including the D4, D6, D9, D11, MD40, TMD40, and various TAMD series (like the TAMD60, TAMD74, TAMD122, and TAMD163). Please see the complete compatibility table for a detailed list.
How often should I replace these zinc anodes?
Anodes should be inspected every 3-6 months and replaced when they are approximately 50% consumed. Replacement frequency depends heavily on water salinity, temperature, and electrical activity around the vessel.
Can I use this zinc anode in freshwater or brackish water?
No. Zinc anodes are specifically formulated for saltwater environments. In fresh or brackish water, a zinc oxide layer can form that passivates the anode, rendering it ineffective. Use an aluminum anode for brackish or polluted water and a magnesium anode for freshwater.
What are the signs that an old anode has failed?
If an old anode appears completely gone, or conversely, looks brand new after a season of use, it may have failed. Accelerated corrosion on nearby metal parts (heat exchangers, engine blocks) is the most critical indicator that your cathodic protection system is not working correctly.
What is the difference between OEM and aftermarket parts?
This listing is for an aftermarket replacement, not an original equipment manufacturer (OEM) part. It is engineered to meet or exceed OEM specifications using comparable materials and is manufactured in an ISO 9002 certified facility with rigorous batch inspections for quality and consistency.
What are your shipping speed and cost?
We ship worldwide quickly, with a typical transit time of 5–15 days for most regions. Standard shipping is free. Expedited shipping options, where available, will be presented at checkout.
What is your warranty and return policy?
Our parts are covered by a 1-year warranty against manufacturing defects under normal use. If you encounter an issue, please contact our support team with your order details. Returns are accepted within our standard window for items that are unused and in their original condition. See our policy page or reach out for instructions.
Safety & Important Info
- Verify images and specifications against your original part before ordering. If anything differs—even if your model appears in the compatibility list—do not purchase.
- This is an aftermarket replacement part, not an OEM component.
- Professional installation is highly recommended for safety, performance, and to prevent engine damage.
About Sea Sierra
- Pro-Grade Standards: We supply marine parts engineered to OEM-level tolerances and rigorously tested for real-world reliability.
- Fast Global Fulfillment: We offer free standard delivery to most regions, with typical transit times of 5–15 days.
- Manufacturer-Direct Value: By working directly with manufacturers, we provide fair pricing without compromising on materials or quality control.
Payment & Security
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