{"product_id":"volvo-penta-21868042-aluminum-anode-kit","title":"Volvo Penta 21868042 Aluminum Anode Kit – D4 D6 DPH DPR DPI Internal Cooling","description":"\u003cp\u003eVolvo Penta 21868042 is a genuine OEM \u003cstrong\u003ealuminum anode kit\u003c\/strong\u003e designed to protect D4 and D6 engines paired with DPH, DPR, and DPI drives from galvanic corrosion. This kit installs within the cooling and exhaust system, where it sacrificially corrodes to protect internal components such as heat exchangers and exhaust passages. Aluminum construction provides longer service life and broader protection than zinc, making it the preferred choice for saltwater and brackish water applications.\u003c\/p\u003e\n\n\u003ch2\u003ePart Information\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 21868042\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Volvo Penta\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOfficial Product Type:\u003c\/strong\u003e Aluminum Anode Kit – Internal Cooling System (OEM)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupersedes:\u003c\/strong\u003e 21718129\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaced By:\u003c\/strong\u003e 21868042 is the current active OEM number\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem:\u003c\/strong\u003e Internal Cooling \/ Exhaust – Galvanic Corrosion Protection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Contents:\u003c\/strong\u003e Aluminum sacrificial anode(s) and sealing O-rings\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eDimensions \u0026amp; Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e ~1.0 kg (kit)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Aluminum (sacrificial anode)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFit Type:\u003c\/strong\u003e OEM direct replacement\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAnode Type:\u003c\/strong\u003e Internal – cooling\/exhaust housing\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatible Applications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eVolvo Penta D4 engine with DPH sterndrive\u003c\/li\u003e\n\u003cli\u003eVolvo Penta D4 engine with DPR sterndrive\u003c\/li\u003e\n\u003cli\u003eVolvo Penta D4 engine with DPI drive\u003c\/li\u003e\n\u003cli\u003eVolvo Penta D6 engine with DPH sterndrive\u003c\/li\u003e\n\u003cli\u003eVolvo Penta D6 engine with DPR sterndrive\u003c\/li\u003e\n\u003cli\u003eVolvo Penta D6 engine with DPI drive\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eFitment can vary by engine version, cooling system configuration, and production range. Always confirm part number 21868042 against your exact engine model and serial number before ordering.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch2\u003eService Interval\u003c\/h2\u003e\n\u003cp\u003eInspect the anode annually — or more frequently in saltwater or high-use applications. Replace when the anode is \u003cstrong\u003e50% consumed or more\u003c\/strong\u003e, during any cooling system service, or when there is evidence of corrosion or blockage in the cooling passages. Do not allow the anode to fully deplete before replacement.\u003c\/p\u003e\n\n\u003ch2\u003eWhen to Replace\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eAnode is 50% consumed or more\u003c\/li\u003e\n\u003cli\u003eScheduled cooling system service\u003c\/li\u003e\n\u003cli\u003eEvidence of corrosion or blockage in cooling passages\u003c\/li\u003e\n\u003cli\u003eAnnual inspection (recommended for saltwater use)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eInstall in the designated cooling\/exhaust housing per the Volvo Penta service diagram\u003c\/li\u003e\n\u003cli\u003eReplace the included O-rings during every service — do not reuse old O-rings\u003c\/li\u003e\n\u003cli\u003eEnsure proper sealing and correct torque on all fittings\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDo not paint anodes\u003c\/strong\u003e — paint prevents the sacrificial reaction and renders the anode ineffective\u003c\/li\u003e\n\u003cli\u003eInspect periodically for wear between annual services in high-salinity environments\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAlternate \u0026amp; Superseded Part Numbers\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e21868042\u003c\/strong\u003e – Current active Volvo Penta OEM part number\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e21718129\u003c\/strong\u003e – Previous Volvo Penta number, superseded by 21868042\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eParts Desk Insights\u003c\/h2\u003e\n\u003cp\u003eInternal anodes are one of the most overlooked service items on diesel sterndrive packages — most owners focus on external anodes and miss this one entirely until corrosion damage shows up inside the heat exchanger or exhaust housing. The most common issue we see is customers waiting until the anode is fully depleted, which can allow corrosion to progress inside the engine before the next service. This kit is best suited for annual cooling system service on D4 and D6 diesel sterndrive packages operating in saltwater or mixed-water environments. Aluminum is the correct choice here — zinc anodes are not recommended for internal cooling system use on these engines.\u003c\/p\u003e","brand":"VOL","offers":[{"title":"Default Title","offer_id":43563989991460,"sku":"21868042","price":161.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/77646c63-332f-4448-8a20-46d5aa4251a6.png?v=1775196766","url":"https:\/\/marisolmarine.com\/products\/volvo-penta-21868042-aluminum-anode-kit","provider":"Marisol Marine Company","version":"1.0","type":"link"}