{"product_id":"sierra-18-5250-ignition-tune-up-kit-for-prestolite-8-cylinder-marine-engines-contact-set-condenser-and-rotor-replaces-mallory-9-29300-omc-172527","title":"Sierra 18-5250 Ignition Tune-Up Kit for MerCruiser 110\/120\/140\/2.5L\/3.0L GM 153\/181 L4 Delco Ignition","description":"\u003cp\u003eThe Sierra 18-5250 Ignition Tune-Up Kit is a complete ignition service kit built for GM in-line 4 and 6 cylinder marine engines running a conventional Delco contact-point ignition system with standard rotation (it is not compatible with Thunderbolt ignition systems). It is precision-built to meet or exceed the original equipment components it replaces, giving boat owners a straightforward way to restore reliable spark and smooth running during a scheduled tune-up.\u003c\/p\u003e\u003cp\u003eThe kit is sized for MerCruiser 110, 120, and 140 I\/O models powered by the GM 153 cid and 181 cid L4 engines, as well as the 2.5L and 3.0L L4 models that continued to use the contact-point ignition into the late 1980s. Coverage spans specific serial number ranges for each model, so matching the engine's serial number to the correct application ensures the kit's components are the right fit before installation. The components carry a machined exterior finish for durability in a marine engine bay environment.\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 18-5250\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Dimensions:\u003c\/strong\u003e 6 x 2.75 x 1.75 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.14 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExterior Finish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIgnition System Compatibility:\u003c\/strong\u003e Conventional Delco ignition, standard rotation (excludes Thunderbolt ignition)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999256256\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e GLM 72610, Evinrude\/Johnson 172527, Mallory 9-29300, Mercruiser 34235T1, Mercruiser 34235Q1, OMC 175257, OMC 172527\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMerCruiser 110 (153 cid GM L4), 1963-1966, Serial 1537370-2044033\u003c\/li\u003e\n\u003cli\u003eMerCruiser 120 (153 cid GM L4), 1964-1986, Serial 1666601-B531853\u003c\/li\u003e\n\u003cli\u003eMerCruiser 2.5L (153 cid GM L4), 1987-1989, Serial B531854-C853255\u003c\/li\u003e\n\u003cli\u003eMerCruiser 140 (181 cid GM L4), 1968-1986, Serial 2508261-B450800\u003c\/li\u003e\n\u003cli\u003eMerCruiser 3.0L (181 cid GM L4), 1987-1989, Serial B450801-C856558\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGLM 72610\u003c\/li\u003e\n\u003cli\u003eEvinrude\/Johnson 172527\u003c\/li\u003e\n\u003cli\u003eMallory 9-29300\u003c\/li\u003e\n\u003cli\u003eMercruiser 34235T1\u003c\/li\u003e\n\u003cli\u003eMercruiser 34235Q1\u003c\/li\u003e\n\u003cli\u003eOMC 175257\u003c\/li\u003e\n\u003cli\u003eOMC 172527\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-5250 tune-up kit fit?\u003c\/strong\u003e The Sierra 18-5250 fits GM in-line 4 cylinder marine engines with a conventional Delco contact-point ignition system, standard rotation, including MerCruiser 110 and 120 (153 cid L4), MerCruiser 140 (181 cid L4), and the 2.5L and 3.0L L4 models within their listed serial number ranges.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-5250 work with a Thunderbolt ignition system?\u003c\/strong\u003e No. The Sierra 18-5250 is designed for conventional Delco contact-point ignitions with standard rotation and specifically excludes engines equipped with Thunderbolt ignition.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-5250 tune-up kit weigh?\u003c\/strong\u003e The Sierra 18-5250 tune-up kit weighs 0.14 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the 18-5250 kit packaging?\u003c\/strong\u003e The Sierra 18-5250 measures 6 x 2.75 x 1.75 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-5250 an OEM part or aftermarket?\u003c\/strong\u003e It is an aftermarket kit manufactured by Sierra, built to meet or exceed the specifications of the original equipment ignition components it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich OEM part numbers does the 18-5250 cross-reference to?\u003c\/strong\u003e The Sierra 18-5250 is interchangeable with GLM 72610, Evinrude\/Johnson 172527, Mallory 9-29300, Mercruiser 34235T1, Mercruiser 34235Q1, and OMC 175257\/172527.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-5250 fit a MerCruiser 3.0L engine?\u003c\/strong\u003e Yes, MerCruiser 3.0L models (181 cid GM L4) built between 1987 and 1989, serial numbers B450801 through C856558, use the Sierra 18-5250 tune-up kit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-5250 fit a MerCruiser 2.5L engine?\u003c\/strong\u003e Yes, the MerCruiser 2.5L (153 cid GM L4) built between 1987 and 1989, serial numbers B531854 through C853255, uses the Sierra 18-5250 tune-up kit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know if the 18-5250 fits my specific MerCruiser engine?\u003c\/strong\u003e Match your engine's serial number to the ranges listed for your model: MerCruiser 110 (1537370-2044033), 120 (1666601-B531853), 140 (2508261-B450800), 2.5L (B531854-C853255), or 3.0L (B450801-C856558), all covered by the Sierra 18-5250.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat finish do the components in the 18-5250 kit have?\u003c\/strong\u003e The components in the Sierra 18-5250 tune-up kit have a machined exterior finish.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-5250 covered under warranty?\u003c\/strong\u003e Yes, the Sierra 18-5250 is covered under Sierra's standard customer satisfaction warranty, the same warranty applied across Sierra's marine parts line.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988204237019,"sku":"SIE-18-5250","price":23.7,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-5250_lg__37359.1558128058.500.750.jpg?v=1785188006","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-5250-ignition-tune-up-kit-for-prestolite-8-cylinder-marine-engines-contact-set-condenser-and-rotor-replaces-mallory-9-29300-omc-172527","provider":"Good Vibes Marina","version":"1.0","type":"link"}