{"product_id":"national-39805-engine-crankshaft-seal","title":"National 39805 Engine Crankshaft Seal - Rear","description":"\u003ch2\u003eOverview of National 39805 Engine Crankshaft Seal\u003c\/h2\u003e\u003cp\u003eThe National 39805 engine crankshaft seal is designed for reliable sealing performance in Dodge D250, D350, W250, and W350 models. Engineered with precision, this oil seal helps maintain engine integrity by preventing oil leaks around the crankshaft.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eInside diameter: 130 mm (5.118 inches)\u003c\/li\u003e\n\u003cli\u003eOutside diameter: 150.44 mm (5.923 inches)\u003c\/li\u003e\n\u003cli\u003eThickness\/width: 14.8 mm (0.583 inches)\u003c\/li\u003e\n\u003cli\u003eMaterial: PTFE for enhanced durability and chemical resistance\u003c\/li\u003e\n\u003cli\u003eHelix type: Counter-clockwise spiral lip design for effective sealing\u003c\/li\u003e\n\u003cli\u003eHousing bore diameter: 150 mm (5.906 inches)\u003c\/li\u003e\n\u003cli\u003eCompatible with Dodge D250, D350, W250, and W350 models\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eTechnical Details and Design Features\u003c\/h2\u003e\u003cp\u003eThe National 39805 crankshaft seal features a PTFE (polytetrafluoroethylene) construction, which offers excellent resistance to heat, chemicals, and wear. Its counter-clockwise spiral lip design ensures a tight seal around the crankshaft, reducing the risk of oil leakage under various operating conditions. The seal’s dimensions—130 mm inside diameter and 150.44 mm outside diameter—are engineered to fit precisely within the housing bore of 150 mm, providing a secure fit for the specified Dodge truck models. The 14.8 mm thickness contributes to the seal’s structural integrity and longevity.\u003c\/p\u003e\u003ch2\u003eCompatible Vehicles and Applications\u003c\/h2\u003e\u003cp\u003eThis engine crankshaft seal is specifically compatible with Dodge heavy-duty trucks, including the D250, D350, W250, and W350 series. It is designed to replace worn or damaged seals in these models, ensuring proper engine oil containment and preventing contamination.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003ePrevents oil leaks around the crankshaft\u003c\/li\u003e\n\u003cli\u003eReduces engine contamination from external debris\u003c\/li\u003e\n\u003cli\u003eMaintains engine oil pressure and efficiency\u003c\/li\u003e\n\u003cli\u003eMinimizes wear on crankshaft and related components\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\u003cp\u003eWhen installing the National 39805 crankshaft seal, ensure the housing bore and crankshaft surfaces are clean and free of debris. Use appropriate tools to press the seal evenly into the housing bore without damaging the sealing lip. Verify the seal orientation matches the counter-clockwise spiral lip design for optimal performance. Lubricate the seal lip lightly with engine oil before installation to reduce initial wear.\u003c\/p\u003e\u003ch2\u003eQuality Assurance and Warranty\u003c\/h2\u003e\u003cp\u003eNational manufactures the 39805 crankshaft seal to meet industry standards for durability and performance. The use of PTFE material and precise engineering supports long service life under demanding conditions. While specific warranty details may vary, National typically offers coverage against manufacturing defects to ensure customer confidence in the product.\u003c\/p\u003e","brand":"National","offers":[{"title":"Default Title","offer_id":43448265179317,"sku":"BCZK-39805","price":77.43,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/NS_39805_Fro.jpg?v=1774734584","url":"https:\/\/www.partcatalog.com\/products\/national-39805-engine-crankshaft-seal","provider":"PartCatalog","version":"1.0","type":"link"}