{"product_id":"zinc-anode-rod-set-fits-volvo-penta-d4-d6-and-tamd-series-replaces-838929-804107-800476","title":"Zinc Anode Rod Set – Fits Volvo Penta D4-D6 and TAMD Series (Replaces 838929, 804107, 800476)","description":"\u003ch2\u003eZinc Anode Rod Set – Fits Volvo Penta D4-D6 and TAMD Series\u003c\/h2\u003e\n\u003cp\u003eThis zinc pencil anode set is designed for sacrificial cathodic protection in Volvo Penta marine diesel engines. Specifically engineered for use in raw water cooling systems, it helps protect vital metal components from galvanic corrosion, which is common in saltwater environments.\u003c\/p\u003e\n\u003cp\u003eThis kit is a direct replacement for multiple Volvo Penta part numbers, including \u003cstrong\u003e838929, 804107, 800476, 858501, and 3838499\u003c\/strong\u003e. It also cross-references with aftermarket parts like Sierra 18-6001, GLM 12789, CMP CM838929Z, and Tecnoseal 00714.\u003c\/p\u003e\n\u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e High-grade zinc designed for optimal performance in saltwater.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eInstallation:\u003c\/strong\u003e Features a 7\/16\" UNC external thread and M8 internal thread for easy installation.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePackage Contents:\u003c\/strong\u003e Includes \u003cspan style=\"color:red;\"\u003e5 x Zinc Pencil Anodes (838929)\u003c\/span\u003e.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Cross-Reference\u003c\/h2\u003e\n\u003cp\u003eUse this table to confirm equivalent part numbers across OEM and aftermarket brands.\u003c\/p\u003e\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n    \u003ctable\u003e\n        \u003cthead\u003e\n            \u003ctr\u003e\n                \u003cth\u003eBrand\u003c\/th\u003e\n                \u003cth\u003ePart Number\u003c\/th\u003e\n            \u003c\/tr\u003e\n        \u003c\/thead\u003e\n        \u003ctbody\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eVolvo Penta\u003c\/td\u003e\n                \u003ctd\u003e838929\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eVolvo Penta\u003c\/td\u003e\n                \u003ctd\u003e804107\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eVolvo Penta\u003c\/td\u003e\n                \u003ctd\u003e800476\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eVolvo Penta\u003c\/td\u003e\n                \u003ctd\u003e858501\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eVolvo Penta\u003c\/td\u003e\n                \u003ctd\u003e3838499\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eSierra\u003c\/td\u003e\n                \u003ctd\u003e18-6001\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eGLM\u003c\/td\u003e\n                \u003ctd\u003e12789\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eCMP\u003c\/td\u003e\n                \u003ctd\u003eCM838929Z\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eTecnoseal\u003c\/td\u003e\n                \u003ctd\u003e00714\u003c\/td\u003e\n            \u003c\/tr\u003e\n        \u003c\/tbody\u003e\n    \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eCompatible Engine Models\u003c\/h2\u003e\n\u003cp\u003eConfirm your engine model\/year in the table below.\u003c\/p\u003e\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n    \u003ctable\u003e\n        \u003cthead\u003e\n            \u003ctr\u003e\n                \u003cth\u003eBrand\u003c\/th\u003e\n                \u003cth\u003eModel\u003c\/th\u003e\n                \u003cth\u003eStroke\u003c\/th\u003e\n                \u003cth\u003eOEM Part No.\u003c\/th\u003e\n            \u003c\/tr\u003e\n        \u003c\/thead\u003e\n        \u003ctbody\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eVolvo Penta\u003c\/td\u003e\n                \u003ctd\u003eMD40A\u003c\/td\u003e\n                \u003ctd\u003e4-Stroke\u003c\/td\u003e\n                \u003ctd\u003e838929\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eVolvo Penta\u003c\/td\u003e\n                \u003ctd\u003eTMD40 A\/B\/C\u003c\/td\u003e\n                \u003ctd\u003e4-Stroke\u003c\/td\u003e\n                \u003ctd\u003e838929\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eVolvo Penta\u003c\/td\u003e\n                \u003ctd\u003eD4 Series\u003c\/td\u003e\n                \u003ctd\u003e4-Stroke\u003c\/td\u003e\n                \u003ctd\u003e838929\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eVolvo Penta\u003c\/td\u003e\n                \u003ctd\u003eD6 Series\u003c\/td\u003e\n                \u003ctd\u003e4-Stroke\u003c\/td\u003e\n                \u003ctd\u003e838929\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eVolvo Penta\u003c\/td\u003e\n                \u003ctd\u003eD9 Series\u003c\/td\u003e\n                \u003ctd\u003e4-Stroke\u003c\/td\u003e\n                \u003ctd\u003e838929\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eVolvo Penta\u003c\/td\u003e\n                \u003ctd\u003eD11 Series\u003c\/td\u003e\n                \u003ctd\u003e4-Stroke\u003c\/td\u003e\n                \u003ctd\u003e838929\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eVolvo Penta\u003c\/td\u003e\n                \u003ctd\u003eTAMD60\u003c\/td\u003e\n                \u003ctd\u003e4-Stroke\u003c\/td\u003e\n                \u003ctd\u003e838929\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eVolvo Penta\u003c\/td\u003e\n                \u003ctd\u003eTAMD63\u003c\/td\u003e\n                \u003ctd\u003e4-Stroke\u003c\/td\u003e\n                \u003ctd\u003e838929\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eVolvo Penta\u003c\/td\u003e\n                \u003ctd\u003eTAMD70\u003c\/td\u003e\n                \u003ctd\u003e4-Stroke\u003c\/td\u003e\n                \u003ctd\u003e838929\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eVolvo Penta\u003c\/td\u003e\n                \u003ctd\u003eTAMD74\u003c\/td\u003e\n                \u003ctd\u003e4-Stroke\u003c\/td\u003e\n                \u003ctd\u003e838929\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eVolvo Penta\u003c\/td\u003e\n                \u003ctd\u003eTAMD75\u003c\/td\u003e\n                \u003ctd\u003e4-Stroke\u003c\/td\u003e\n                \u003ctd\u003e838929\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eVolvo Penta\u003c\/td\u003e\n                \u003ctd\u003eTAMD103\u003c\/td\u003e\n                \u003ctd\u003e4-Stroke\u003c\/td\u003e\n                \u003ctd\u003e838929\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eVolvo Penta\u003c\/td\u003e\n                \u003ctd\u003eTAMD122A\u003c\/td\u003e\n                \u003ctd\u003e4-Stroke\u003c\/td\u003e\n                \u003ctd\u003e838929\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eVolvo Penta\u003c\/td\u003e\n                \u003ctd\u003eTAMD122P\u003c\/td\u003e\n                \u003ctd\u003e4-Stroke\u003c\/td\u003e\n                \u003ctd\u003e838929\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eVolvo Penta\u003c\/td\u003e\n                \u003ctd\u003eD12C\u003c\/td\u003e\n                \u003ctd\u003e4-Stroke\u003c\/td\u003e\n                \u003ctd\u003e838929\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eVolvo Penta\u003c\/td\u003e\n                \u003ctd\u003eTAMD162C\u003c\/td\u003e\n                \u003ctd\u003e4-Stroke\u003c\/td\u003e\n                \u003ctd\u003e838929\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eVolvo Penta\u003c\/td\u003e\n                \u003ctd\u003eTAMD163A-A\u003c\/td\u003e\n                \u003ctd\u003e4-Stroke\u003c\/td\u003e\n                \u003ctd\u003e838929\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eVolvo Penta\u003c\/td\u003e\n                \u003ctd\u003eTAMD163P-A\u003c\/td\u003e\n                \u003ctd\u003e4-Stroke\u003c\/td\u003e\n                \u003ctd\u003e838929\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eVolvo Penta\u003c\/td\u003e\n                \u003ctd\u003e2001 Series\u003c\/td\u003e\n                \u003ctd\u003e4-Stroke\u003c\/td\u003e\n                \u003ctd\u003e838929\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eVolvo Penta\u003c\/td\u003e\n                \u003ctd\u003e2002 Series\u003c\/td\u003e\n                \u003ctd\u003e4-Stroke\u003c\/td\u003e\n                \u003ctd\u003e838929\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eVolvo Penta\u003c\/td\u003e\n                \u003ctd\u003e2003 Series\u003c\/td\u003e\n                \u003ctd\u003e4-Stroke\u003c\/td\u003e\n                \u003ctd\u003e838929\u003c\/td\u003e\n            \u003c\/tr\u003e\n        \u003c\/tbody\u003e\n    \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n    \u003cthead\u003e\n        \u003ctr\u003e\n            \u003cth\u003eSpecification\u003c\/th\u003e\n            \u003cth\u003eValue\u003c\/th\u003e\n        \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e\u003cstrong\u003eProduct Type\u003c\/strong\u003e\u003c\/td\u003e\n            \u003ctd\u003eZinc Pencil Anode\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e\u003cstrong\u003eInstallation\u003c\/strong\u003e\u003c\/td\u003e\n            \u003ctd\u003eThreaded\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n            \u003ctd\u003eZinc (for use in saltwater)\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e\u003cstrong\u003eFunction\u003c\/strong\u003e\u003c\/td\u003e\n            \u003ctd\u003eSacrificial Cathodic Protection\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e\u003cstrong\u003eHousing Material\u003c\/strong\u003e\u003c\/td\u003e\n            \u003ctd\u003eZinc\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n            \u003ctd\u003eLength: 44.45 mm (1-3\/4\"), Diameter: 14.29 mm (9\/16\")\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e\u003cstrong\u003eExternal Thread\u003c\/strong\u003e\u003c\/td\u003e\n            \u003ctd\u003e7\/16\" UNC\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e\u003cstrong\u003eInternal Thread\u003c\/strong\u003e\u003c\/td\u003e\n            \u003ctd\u003eM8\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n            \u003ctd\u003e0.045 kg (0.10 lbs)\u003c\/td\u003e\n        \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003ePackage Contents\u003c\/h2\u003e\n\u003cul\u003e\n    \u003cli\u003e\n\u003cspan style=\"color:red;\"\u003e5 x\u003c\/span\u003e Zinc Pencil Anode (Replaces 838929)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Guide\u003c\/h2\u003e\n\u003col\u003e\n    \u003cli\u003eBefore starting, ensure the engine is off and has cooled down. Close the corresponding seacock to prevent water from entering the vessel.\u003c\/li\u003e\n    \u003cli\u003eLocate the existing zinc anode plug on your engine's cooling system. It is typically found on the heat exchanger, oil cooler, or aftercooler.\u003c\/li\u003e\n    \u003cli\u003eCarefully drain the cooling system component where the anode is located to avoid spillage.\u003c\/li\u003e\n    \u003cli\u003eUse an appropriate wrench to unscrew and remove the old anode plug. The old anode may be heavily corroded or completely gone.\u003c\/li\u003e\n    \u003cli\u003eClean the threads of the plug housing thoroughly to ensure a good connection and prevent leaks.\u003c\/li\u003e\n    \u003cli\u003eScrew the new zinc anode into the housing by hand until it is snug.\u003c\/li\u003e\n    \u003cli\u003eUse a wrench to tighten the plug securely, but \u003cstrong\u003edo not overtighten\u003c\/strong\u003e as this can damage the threads or the plug.\u003c\/li\u003e\n    \u003cli\u003eOnce the new anode is installed, re-open the seacock.\u003c\/li\u003e\n    \u003cli\u003eStart the engine and carefully inspect the area around the new anode plug for any signs of water leaks.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I confirm this anode fits my engine?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003ePlease review the \u003cstrong\u003eCompatible Engine Models\u003c\/strong\u003e table on this page to see if your specific model is listed. You should also cross-reference your existing part number with the numbers in our \u003cstrong\u003ePart Number Cross-Reference\u003c\/strong\u003e table to ensure an exact match.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow often should I replace my zinc anode?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eInspection intervals can vary based on usage and water conditions, but a general rule is to check your anodes every 3-6 months. The anode should be replaced when it is approximately \u003cstrong\u003e50% consumed\u003c\/strong\u003e to ensure continuous protection.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the signs of a failing or depleted anode?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIf an anode is depleted, galvanic corrosion will attack other metal components in the cooling system, such as the heat exchanger core. Signs include premature corrosion, pitting, or rust on these parts. Regular inspection is key to preventing this damage.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eOEM vs. Aftermarket?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThis listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow fast do you ship and how much does it cost?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWe offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is your warranty and return policy?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThis product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused \u0026amp; in original condition); please see our policy page or reach out for instructions.\u003c\/p\u003e\n\n\u003ch2\u003eImportant Notes\u003c\/h2\u003e\n\u003cul\u003e\n    \u003cli\u003eVerify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.\u003c\/li\u003e\n    \u003cli\u003eThis product is an aftermarket replacement part and is not an OEM component.\u003c\/li\u003e\n    \u003cli\u003eProfessional installation is recommended to ensure safety and optimal performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Choose JLM MARINE?\u003c\/h2\u003e\n\u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eQuality Assured:\u003c\/strong\u003e As a trusted manufacturer for over 20 years, we supply top marine brands globally.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFast Global Shipping:\u003c\/strong\u003e Free delivery worldwide in 5–15 days.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDirect from Manufacturer:\u003c\/strong\u003e Competitive pricing without compromising quality.\u003c\/li\u003e\n\u003c\/ul\u003e\n","brand":"JLM Marine","offers":[{"title":"Default Title","offer_id":51310655930681,"sku":"ZA014","price":19.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/0433\/6697\/files\/ZA014_5717d700-1605-4a57-9f8a-f40a59ddf6eb.png?v=1762053250","url":"https:\/\/jlmmarine.com\/products\/zinc-anode-rod-set-fits-volvo-penta-d4-d6-and-tamd-series-replaces-838929-804107-800476","provider":"JLM Marine Boat Parts Limited","version":"1.0","type":"link"}