{"product_id":"sierra-18-5281-tune-up-kit-delco-est-v-8-distributor-cap-and-rotor-interchanges-mercruiser-808483q2-fits-1996-2005-indmar-monsoon-mcx-rpt-hammerhead","title":"Sierra 18-5281 Tune-Up Kit - GM V-8 Distributor Cap and Rotor, Fits 1996-2005 Indmar Monsoon, MCX, RPT, Hammerhead","description":"\u003cp\u003eThe Sierra 18-5281 Tune-Up Kit is a distributor cap and rotor set built as a direct replacement for GM V-8 Delco EST marine ignition systems. The kit contains a Sierra 18-5354 distributor cap and an 18-5405 rotor, giving boat owners the two most common ignition wear parts in a single package for a routine tune-up or ignition service. Replacing the cap and rotor together helps restore reliable spark delivery, smoother idle, and consistent starting on engines where these components have worn, cracked, or corroded from heat cycling and moisture exposure typical of a marine engine compartment.\u003c\/p\u003e\u003cp\u003eKit 18-5281 is interchangeable with GLM 71810, Mallory 9-29308, and Mercruiser 808483Q2, so it can be cross-referenced against those part numbers when sourcing a replacement. It fits 1996-2005 Indmar Monsoon, MCX, RPT, and Hammerhead engines.\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 18-5281\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Components:\u003c\/strong\u003e Distributor cap (18-5354), rotor (18-5405)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine Compatibility:\u003c\/strong\u003e GM V-8 Delco EST ignition\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Multi-colored\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.61 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282105105\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e1996-2005 Indmar Monsoon, MCX, RPT, and Hammerhead engines\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGLM 71810\u003c\/li\u003e\n\u003cli\u003eMallory 9-29308\u003c\/li\u003e\n\u003cli\u003eMercruiser 808483Q2\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is included in the Sierra 18-5281 Tune-Up Kit?\u003c\/strong\u003e The kit contains a Sierra 18-5354 distributor cap and an 18-5405 rotor, the two parts needed for a distributor cap and rotor tune-up on covered GM V-8 marine ignition systems.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the 18-5281 Tune-Up Kit fit?\u003c\/strong\u003e It fits 1996-2005 Indmar Monsoon, MCX, RPT, and Hammerhead engines equipped with a GM V-8 Delco EST ignition system.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-5281 kit interchangeable with other brands' part numbers?\u003c\/strong\u003e Yes, Sierra 18-5281 is interchangeable with GLM 71810, Mallory 9-29308, and Mercruiser 808483Q2.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-5281 kit include spark plugs or plug wires?\u003c\/strong\u003e No, the kit is limited to the distributor cap (18-5354) and rotor (18-5405); it does not include spark plugs or ignition wires.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-5281 Tune-Up Kit weigh?\u003c\/strong\u003e The complete kit weighs 0.61 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-5281 Tune-Up Kit?\u003c\/strong\u003e The UPC for Sierra Tune-Up Kit 18-5281 is 808282105105.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I order just the cap or just the rotor separately?\u003c\/strong\u003e The 18-5281 listing is sold as a combined kit containing both the 18-5354 cap and 18-5405 rotor rather than as individual components.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-5281 kit work on any GM V-8 marine engine?\u003c\/strong\u003e It is built for GM V-8 Delco EST ignition systems and is confirmed to fit 1996-2005 Indmar Monsoon, MCX, RPT, and Hammerhead engines; compatibility outside those applications should be checked against your engine's existing distributor cap and rotor part numbers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy replace the distributor cap and rotor together?\u003c\/strong\u003e Cap and rotor wear at a similar rate from heat and electrical arcing, so the Sierra 18-5281 kit pairs both parts to restore consistent spark timing and avoid mismatched wear between old and new components.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs Sierra 18-5281 a genuine Sierra part?\u003c\/strong\u003e Yes, 18-5281 is a Sierra-branded Tune-Up Kit manufactured under the Sierra part number 18-5281.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988205777115,"sku":"SIE-18-5281","price":43.19,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-5281__39865.1737825615.500.750.jpg?v=1785188097","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-5281-tune-up-kit-delco-est-v-8-distributor-cap-and-rotor-interchanges-mercruiser-808483q2-fits-1996-2005-indmar-monsoon-mcx-rpt-hammerhead","provider":"Good Vibes Marina","version":"1.0","type":"link"}