{"product_id":"national-5723-engine-crankshaft-seal","title":"National 5723 Engine Crankshaft Seal - Rear","description":"\u003ch2\u003eOverview of National Engine Crankshaft Seal 5723\u003c\/h2\u003e\u003cp\u003eThe National 5723 engine crankshaft seal is designed for reliable sealing performance in Ford trucks and vans. Engineered with precision, this oil seal kit ensures effective protection against oil leaks in various Ford E-350 and F-Series models.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eInside diameter: 4.375 inches (111.130 mm)\u003c\/li\u003e\n\u003cli\u003eOutside diameter: 5.179 inches (131.550 mm)\u003c\/li\u003e\n\u003cli\u003eThickness: 0.400 inches (10.160 mm)\u003c\/li\u003e\n\u003cli\u003eMaterial: Durable PTFE for enhanced wear resistance\u003c\/li\u003e\n\u003cli\u003eHelix type: Counter-clockwise spiral lip design for optimal sealing\u003c\/li\u003e\n\u003cli\u003eCompatible housing bore: 5.169 inches (131.290 mm)\u003c\/li\u003e\n\u003cli\u003ePart type: Forward-facing hub (Fw-h) oil seal\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eDetailed Product Description\u003c\/h2\u003e\u003cp\u003eThe National 5723 crankshaft seal is part of the 5700 series, crafted to meet the demanding requirements of Ford vehicles such as the E-350 Club Wagon, E-350 Econoline, F-250 Super Duty, and F-350 Super Duty. Constructed from PTFE material, this seal offers excellent chemical resistance and durability under high-temperature engine conditions. The counter-clockwise spiral lip design enhances sealing efficiency by maintaining consistent contact with the crankshaft, reducing oil leakage and contamination risks. With precise dimensions including a 4.375-inch shaft diameter and a 5.179-inch outside diameter, this seal fits securely within the housing bore of 5.169 inches, ensuring a tight and reliable fit.\u003c\/p\u003e\u003ch2\u003eCompatible Ford Models and Applications\u003c\/h2\u003e\u003cp\u003eThis engine crankshaft seal is compatible with the following Ford models:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFord E-350 Club Wagon\u003c\/li\u003e\n\u003cli\u003eFord E-350 Econoline and Econoline Club Wagon\u003c\/li\u003e\n\u003cli\u003eFord E-350 Super Duty\u003c\/li\u003e\n\u003cli\u003eFord Excursion\u003c\/li\u003e\n\u003cli\u003eFord F-250, F-250 HD, and F-250 Super Duty\u003c\/li\u003e\n\u003cli\u003eFord F-350 and F-350 Super Duty\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCommon Issues Addressed by National 5723 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\u003eMaintains engine oil pressure and performance\u003c\/li\u003e\n\u003cli\u003eMinimizes wear on crankshaft and seal interface\u003c\/li\u003e\n\u003cli\u003eHelps avoid costly engine repairs due to oil loss\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eEnsure the crankshaft and housing bore are clean and free of debris before installation\u003c\/li\u003e\n\u003cli\u003eUse proper tools to avoid damaging the PTFE seal lip during installation\u003c\/li\u003e\n\u003cli\u003eVerify the seal orientation matches the counter-clockwise spiral lip design\u003c\/li\u003e\n\u003cli\u003eCheck for correct fitment with the 4.375-inch shaft and 5.179-inch housing bore dimensions\u003c\/li\u003e\n\u003cli\u003eApply a light coat of engine oil on the seal lip to facilitate smooth installation\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eQuality Assurance and Warranty\u003c\/h2\u003e\u003cp\u003eNational's 5723 engine crankshaft seal is manufactured to meet industry standards for durability and performance. The use of PTFE material and precise engineering ensures long service life under typical operating conditions. While specific warranty details may vary, National products generally come with a limited warranty against manufacturing defects, providing confidence in product reliability.\u003c\/p\u003e","brand":"National","offers":[{"title":"Default Title","offer_id":43448227135669,"sku":"BCZK-5723","price":63.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/NS_5723_Ang.jpg?v=1774734535","url":"https:\/\/www.partcatalog.com\/products\/national-5723-engine-crankshaft-seal","provider":"PartCatalog","version":"1.0","type":"link"}