{"product_id":"national-3945-engine-crankshaft-seal","title":"National 3945 Engine Crankshaft Seal - Front","description":"\u003ch2\u003eNational 3945 Engine Crankshaft Seal Overview\u003c\/h2\u003e\u003cp\u003eThe National 3945 engine crankshaft seal is designed to provide reliable sealing performance for a range of Chevrolet, GMC, Hummer, and Pontiac vehicles. Engineered with a bi-directional lip design and durable polyacrylate material, this oil seal helps maintain engine integrity by preventing oil leaks around the crankshaft.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eInside diameter: 2.330 inches (59.18 mm)\u003c\/li\u003e\n\u003cli\u003eOutside diameter: 3.005 inches (76.33 mm)\u003c\/li\u003e\n\u003cli\u003eThickness\/width: 0.400 inches (10.16 mm)\u003c\/li\u003e\n\u003cli\u003eBi-directional helix lip design for enhanced sealing\u003c\/li\u003e\n\u003cli\u003eConstructed from polyacrylate material for durability\u003c\/li\u003e\n\u003cli\u003eRedicoat surface treatment for improved wear resistance\u003c\/li\u003e\n\u003cli\u003eCompatible with housing bore of 3.000 inches (76.2 mm)\u003c\/li\u003e\n\u003cli\u003ePart number: 3945, Series 3000\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eDetailed Product Description and Attributes\u003c\/h2\u003e\u003cp\u003eThe National 3945 crankshaft seal features a bi-directional helix lip design that effectively prevents oil leakage in both rotational directions, making it suitable for various engine applications. The seal’s polyacrylate construction offers resistance to heat, oil, and wear, ensuring long-lasting performance. With an inside diameter of 2.330 inches and an outside diameter of 3.005 inches, this seal fits precisely into housings with a 3.000-inch bore, providing a secure and tight fit. The 0.400-inch thickness balances flexibility and strength, while the Redicoat treatment enhances the seal’s surface durability against abrasion and corrosion. This seal is part of National’s Series 3000, known for consistent quality in engine gaskets and sealing systems.\u003c\/p\u003e\u003ch2\u003eCompatible Vehicles and Applications\u003c\/h2\u003e\u003cp\u003eThis engine crankshaft seal is compatible with a wide range of Chevrolet, GMC, Hummer, and Pontiac models, including but not limited to:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eChevrolet Blazer, C10, C1500, Camaro, Caprice, Corvette, Impala, Malibu, Monte Carlo, Nova, Tahoe, Yukon\u003c\/li\u003e\n\u003cli\u003eGMC C20, C2500, C3500, Jimmy, K5 Blazer, K10, K20, K1500, K2500, Savana 2500, Savana 3500\u003c\/li\u003e\n\u003cli\u003eHummer H1\u003c\/li\u003e\n\u003cli\u003ePontiac Acadian, Parisienne\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eThese vehicles benefit from the National 3945 seal’s precise fit and durable construction, helping maintain engine oil containment and performance.\u003c\/p\u003e\u003ch2\u003eCommon Issues Addressed by the National 3945 Seal\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003ePrevents oil leaks around the crankshaft area\u003c\/li\u003e\n\u003cli\u003eReduces engine contamination from external debris\u003c\/li\u003e\n\u003cli\u003eMinimizes wear on crankshaft and housing bore\u003c\/li\u003e\n\u003cli\u003eMaintains engine oil pressure and efficiency\u003c\/li\u003e\n\u003cli\u003eHelps avoid costly engine repairs due to seal failure\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eEnsure the housing bore is clean and free of debris before installation\u003c\/li\u003e\n\u003cli\u003eVerify the housing bore diameter is 3.000 inches (76.2 mm) for proper fit\u003c\/li\u003e\n\u003cli\u003eLubricate the seal lip with clean engine oil prior to installation to prevent dry running\u003c\/li\u003e\n\u003cli\u003eUse appropriate tools to press the seal evenly into the housing without distortion\u003c\/li\u003e\n\u003cli\u003eInspect the crankshaft surface for wear or damage before installing the seal\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eQuality Assurance and Warranty\u003c\/h2\u003e\u003cp\u003eNational’s 3945 engine crankshaft seal is manufactured to meet strict quality standards for durability and performance. The polyacrylate material and Redicoat treatment contribute to extended service life under normal operating conditions. While specific warranty details may vary, National products typically come with a limited warranty against manufacturing defects, ensuring confidence in the seal’s reliability for compatible Chevrolet, GMC, Hummer, and Pontiac vehicles.\u003c\/p\u003e","brand":"National","offers":[{"title":"Default Title","offer_id":43448189812917,"sku":"BCZK-3945","price":18.41,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/NS_3945_Fro_d31199fb-4009-45c5-b55b-d9bf1561fc1a.jpg?v=1774734516","url":"https:\/\/www.partcatalog.com\/products\/national-3945-engine-crankshaft-seal","provider":"PartCatalog","version":"1.0","type":"link"}