{"product_id":"sierra-18-7677-knock-sensor-for-mercruiser-gm-v-8-305-350-377-cid-replaces-oem-r020027","title":"Sierra 18-7677 Knock Sensor, Replaces R020027, Fits MerCruiser MCM\/MIE GM V-8 305, 350 and 377 CID Engines","description":"\u003cp\u003eThe Sierra 18-7677 Knock Sensor is a detonation sensor built to meet the demands of high horsepower marine engines operating in the harsh marine environment. It is engineered to meet or exceed the original equipment part it replaces, giving boat owners a reliable option for restoring accurate detonation detection on applicable GM-based inboard and sterndrive engines. Sierra supplies OEM engine manufacturers and boat builders with quality parts, and this knock sensor is built to that same standard.\u003c\/p\u003e\u003cp\u003eThis sensor is designed for MerCruiser MCM\/MIE applications using GM V-8 305, 350 and 377 CID engines. It mounts via a flange mount configuration and uses a glass sensor body with an analog output type. The compact housing measures 0.39 x 0.39 x 0.39 inches, making it a direct functional replacement for the original detonation sensor on these engine platforms. Every Sierra part 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 18-7677\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Knock Sensor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Glass\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Type:\u003c\/strong\u003e Flange Mount\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput Type:\u003c\/strong\u003e Analog\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem 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 0.22 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282287405\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMerCruiser MCM\/MIE GM V-8 305, 350 and 377 CID engines\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eR020027\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-7677 knock sensor fit?\u003c\/strong\u003e The Sierra 18-7677 knock sensor is designed for MerCruiser MCM\/MIE applications using GM V-8 305, 350 and 377 CID engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does the 18-7677 replace?\u003c\/strong\u003e It replaces OEM number R020027, so any application originally fitted with R020027 can use the Sierra 18-7677 as a direct replacement.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the 18-7677 knock sensor made of?\u003c\/strong\u003e The sensor body is made of glass, housed in a compact flange-mount design measuring 0.39 x 0.39 x 0.39 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-7677 knock sensor weigh?\u003c\/strong\u003e This knock sensor weighs 0.22 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow does the knock sensor mount to the engine?\u003c\/strong\u003e The 18-7677 uses a flange mount configuration for installation on compatible GM V-8 marine engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat type of output does the 18-7677 knock sensor produce?\u003c\/strong\u003e This sensor produces an analog output signal, matching the original equipment detonation sensor it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-7677 a genuine OEM part or aftermarket?\u003c\/strong\u003e It is a Sierra-manufactured part engineered to meet or exceed the specifications of the original equipment sensor (R020027) it replaces, sold as a quality aftermarket replacement.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when ordering the 18-7677?\u003c\/strong\u003e The order includes one Sierra 18-7677 Knock Sensor, ready to install in place of the original R020027 sensor.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-7677 knock sensor come with a warranty?\u003c\/strong\u003e Yes, the Sierra 18-7677 knock sensor is covered under Sierra's customer satisfaction warranty.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-7677 knock sensor work on any GM V-8 marine engine?\u003c\/strong\u003e It is intended for MerCruiser MCM\/MIE GM V-8 engines in the 305, 350 and 377 CID range specifically, rather than being a universal fit across all GM V-8 marine engines.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988386427099,"sku":"SIE-18-7677","price":91.06,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-7677__27474.1558186420.500.750.jpg?v=1785188301","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-7677-knock-sensor-for-mercruiser-gm-v-8-305-350-377-cid-replaces-oem-r020027","provider":"Good Vibes Marina","version":"1.0","type":"link"}