{"product_id":"michigan-motorsports-front-ls-crankshaft-damper-seal-oe-fit-for-gen-iii-iv-ls-12585673-stops-oil-leaks","title":"Michigan Motorsports Front LS Crankshaft Damper Seal — OE-fit for Gen III \u0026 IV LS (12585673) stops oil leaks","description":"\u003cp\u003e\u003cstrong\u003eThe Michigan Motorsports Front LS Crankshaft Damper Seal is an OE-spec replacement seal that stops front-crankshaft oil leaks on Gen III and Gen IV LS engines (fits GM 12585673 applications).\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eWhen an LS engine develops an oil drip from the front crank area, the front damper seal is often the culprit. This Michigan Motorsports unit is manufactured to match factory dimensions and materials so it installs cleanly around the crank snout and harmonic balancer. It’s intended for rebuilds, routine maintenance, and performance projects that require dependable oil control without modifying the engine’s front cover or balancer.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this seal restore oil control on my LS engine?\u003c\/h3\u003e\n\u003cp\u003eThe seal replaces worn or hardened lip material that allows oil to escape at the crankshaft. By providing a fresh elastomer sealing lip and proper inner diameter tolerance, it re-establishes the barrier between the crankcase oil and the external accessory area. You’ll see reduced seepage and cleaner engine bays when installed correctly.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePrecisely sized to match GM part 12585673 fit and mounting geometry\u003c\/li\u003e\n  \u003cli\u003eElastomer compound resists heat and oil breakdown\u003c\/li\u003e\n  \u003cli\u003eTight lip profile minimizes capillary seepage at startup and under load\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhich LS engines and models is this compatible with?\u003c\/h3\u003e\n\u003cp\u003eThis front crankshaft damper seal is engineered for a broad span of Gen III and Gen IV LS-family engines. It fits common displacements used in GM trucks, SUVs, and performance cars, making it a versatile replacement when the original seal has failed. Confirm compatibility by cross-referencing GM 12585673 with your engine code or vehicle application.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eFits 4.8L, 5.3L, 5.7L, 6.0L, 6.2L and 7.0L LS platforms\u003c\/li\u003e\n  \u003cli\u003eCommon applications: LS1, LS3, LQ4, LQ9, LS7 and other Gen III\/IV variants\u003c\/li\u003e\n  \u003cli\u003eSuitable for both factory and many aftermarket dampers\/harmonic balancers\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIs installation difficult and what should I prepare?\u003c\/h3\u003e\n\u003cp\u003eInstallation is straightforward for anyone comfortable with basic engine front-end work. The seal requires careful seating and correct alignment to the crank snout; using the proper driver tool or installer reduces the risk of lip damage. Replace the seal during front cover or balancer service to avoid later removal and rework.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eRecommend removing harmonic balancer and cleaning crank snout before fitting\u003c\/li\u003e\n  \u003cli\u003eUse a seal driver or socket sized to the outer diameter to press evenly\u003c\/li\u003e\n  \u003cli\u003eLightly oil sealing lip with engine oil to ease installation and prevent dry starts\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat performance and durability can I expect?\u003c\/h3\u003e\n\u003cp\u003eBuilt from materials chosen to tolerate high under-hood temperatures and continuous oil exposure, this seal is intended to provide long-term service in both daily-driven and performance LS engines. While it doesn’t change oil system pressures or engine internals, it restores factory-level sealing performance and prevents progressive oil contamination of belts, pulleys, and accessory components.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eOE-quality materials resist heat, oil, and ambient contaminants\u003c\/li\u003e\n  \u003cli\u003eDesigned for long service life under normal operating conditions\u003c\/li\u003e\n  \u003cli\u003eHelps maintain clean accessory drive components and under-hood appearance\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: owners and mechanics working on Gen III\/IV LS engines who need a precise, OE-style replacement for a leaking front crankshaft damper seal. It’s ideal for restoration projects, routine maintenance, or performance builds where a reliable seal is required to prevent front-end oil leaks without altering the engine’s original configuration.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does this replace GM part 12585673?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. This Michigan Motorsports seal is an OE-quality replacement compatible with GM part number 12585673.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I install it without replacing the harmonic balancer?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: You can, but removing the balancer makes correct seating easier and reduces seal damage risk during installation.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Michigan Motorsports","offers":[{"title":"Default Title","offer_id":48084466008222,"sku":"B09HFJJQDP","price":30.48,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/michigan-motorsports-front-seal-packaging.jpg?v=1785856334","url":"https:\/\/northtrailauto.ca\/products\/michigan-motorsports-front-ls-crankshaft-damper-seal-oe-fit-for-gen-iii-iv-ls-12585673-stops-oil-leaks","provider":"North Trail Auto","version":"1.0","type":"link"}