{"product_id":"sierra-18-3905-piston-ring-set-for-johnson-evinrude-85-300-hp-outboards-030-oversize-3-53-bore-replaces-omc-396504","title":"Sierra Piston Ring Set 18-3905,.030 Inch Oversize, for Johnson\/Evinrude OMC Outboards, Replaces OMC 396504","description":"\u003cp\u003eThe Sierra 18-3905 is a.030 inch oversize piston ring set built for rebuilding Johnson and Evinrude OMC outboard powerheads. When a cylinder has been bored.030 inch over standard to true up worn or scored walls, this ring set restores proper compression and oil control so the rebuilt engine seals and runs like new. Each ring is machined to close tolerances for a consistent, even seal against the cylinder wall, helping the powerhead hold compression and resist blow-by after a rebuild.\u003c\/p\u003e\u003cp\u003eThe 18-3905 set is part of Sierra's Evinrude Outboard OMC Eagle and Sea Drive piston program, and it interchanges with common aftermarket and OEM ring numbers, making it a straightforward replacement when the original OMC rings are no longer available. Every Sierra part is manufactured to meet or exceed the specification of the original equipment it replaces and is backed by Sierra's customer satisfaction warranty.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-3905\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Piston Ring Set\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOversize:\u003c\/strong\u003e.030 inch (30 thousandths over standard)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Dimensions:\u003c\/strong\u003e 0.39 x 0.39 x 0.39 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.08 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999316998\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Johnson and Evinrude OMC outboard engines\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e OMC Eagle and Sea Drive series pistons\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eThe Sierra 18-3905 piston ring set is designed for use in Johnson and Evinrude outboard applications, specifically OMC Eagle and Sea Drive series powerheads.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOMC 396504\u003c\/li\u003e\n\u003cli\u003eGLM 24300\u003c\/li\u003e\n\u003cli\u003eMallory 9-54418\u003c\/li\u003e\n\u003cli\u003eMallory 9-54422\u003c\/li\u003e\n\u003cli\u003eWiseco 3530KD\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines is the Sierra 18-3905 piston ring set designed for?\u003c\/strong\u003e The Sierra 18-3905 is designed for use in Johnson and Evinrude OMC outboard engines, specifically the OMC Eagle and Sea Drive series powerheads.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat size oversize is the 18-3905 ring set?\u003c\/strong\u003e It is a.030 inch oversize set, meaning it is sized for a cylinder that has been bored 30 thousandths of an inch over standard to clean up a worn or damaged bore.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-3905 replace the OMC 396504 piston ring?\u003c\/strong\u003e Yes, the Sierra 18-3905 is a direct interchange for OMC 396504 as well as GLM 24300, Mallory 9-54418 and 9-54422, and Wiseco 3530KD.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs Sierra 18-3905 a genuine OEM part or an aftermarket replacement?\u003c\/strong\u003e It is a Sierra aftermarket replacement part manufactured to meet or exceed the specification of the original OMC 396504 ring it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-3905 piston ring set weigh?\u003c\/strong\u003e The Sierra 18-3905 weighs 0.08 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat finish do the 18-3905 piston rings have?\u003c\/strong\u003e The rings in the 18-3905 set have a machined finish for a precise, consistent seal against the cylinder wall.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen would I need the.030 oversize 18-3905 rings instead of standard-size rings?\u003c\/strong\u003e You need the.030 oversize 18-3905 set after a cylinder has been bored.030 inch over standard during a rebuild, which is typically done to true up a worn or scored bore.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the Sierra 18-3905 piston ring package?\u003c\/strong\u003e The Sierra 18-3905 piston ring set has product dimensions of 0.39 x 0.39 x 0.39 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3905 covered by a warranty?\u003c\/strong\u003e Yes, the 18-3905 is covered under Sierra's customer satisfaction warranty like all Sierra marine parts.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-3905 piston ring set?\u003c\/strong\u003e The UPC for the Sierra 18-3905 is 030999316998.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988169863387,"sku":"SIE-18-3905","price":36.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-3905__97830.1739458760.500.750.jpg?v=1785189208","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-3905-piston-ring-set-for-johnson-evinrude-85-300-hp-outboards-030-oversize-3-53-bore-replaces-omc-396504","provider":"Good Vibes Marina","version":"1.0","type":"link"}