{"product_id":"enl80-0203-valve-spring","title":"4F5409 Inner Valve Spring Fits Caterpillar Industrial Construction Models","description":"\u003ch3\u003eOne New Aftermarket Replacement Inner Valve Spring Fits Caterpillar (Fits CAT) Industrial and Construction Engines\u003c\/h3\u003e\u003cp\u003eThis aftermarket replacement inner valve spring fits the cylinder head valve train on Fits Caterpillar D-series industrial, construction, and gas engines. The inner spring works in conjunction with the outer valve spring to keep intake and exhaust valves firmly seated against the valve seat during operation, preventing blow-by and maintaining compression. Replacing worn or fatigued valve springs at overhaul is essential for restoring proper engine breathing and performance.\u003c\/p\u003e\u003ch4\u003eCompatible Models\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eFits Caterpillar Industrial Engines:\u003c\/strong\u003e D342, D342C, D353C, D353E, D364, D375, D375D, D379, D379A, D397D, D398, D398A, G353D, G379, G398\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFits Caterpillar Track-Type Tractors:\u003c\/strong\u003e D8H, D9E, D9G\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFits Caterpillar Motor Graders:\u003c\/strong\u003e 14G, 16G\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFits Caterpillar Scrapers:\u003c\/strong\u003e 621B, 637D, 637E, 651E\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e Models D7C, D8D, and D9D are listed in catalog data but not confirmed by OEM parts reference -- verify fitment before ordering.\u003c\/p\u003e\u003ch4\u003eReplaces Part Number(s):\u003c\/h4\u003e\u003cp\u003e4F5409, ENL80-0203\u003c\/p\u003e\u003cp\u003eNew aftermarket replacement part - not remanufactured, not used.\u003c\/p\u003e","brand":"Reliable Aftermarket Parts, Inc® -OD","offers":[{"title":"Default Title","offer_id":17725327474739,"sku":"ENL80-0203","price":19.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0079\/4060\/3955\/files\/ENL80-0203_01.jpg?v=1757972340","url":"https:\/\/www.reliableaftermarketparts.co.uk\/products\/enl80-0203-valve-spring","provider":"Reliable Aftermarket Parts, Inc®","version":"1.0","type":"link"}