{"product_id":"sierra-18-2172-engine-coupler-replaces-mercruiser-14505a2-fits-gm-v-6-v-8-305-350-cid","title":"Sierra 18-2172 Engine Coupler, Replaces 14505A2, for GM V6\/V8 Engines with Triangular 3-Bolt Coupler","description":"\u003cp\u003eThe Sierra 18-2172 Engine Coupler is a triangular, 3-bolt engine coupler built for GM V6 and V8 marine engines, excluding MC-I, Alpha, and Bravo drive applications. It is the direct replacement for OEM number 14505A2, and also cross-references to 38965A1, 38965A2, and 76850A2.\u003c\/p\u003e\u003cp\u003eThis coupler is used specifically when converting an engine that has a 2-piece rear main seal with a 3-1\/2 inch crankshaft bolt pattern over to a newer engine design that uses a 1-piece rear main seal with a 3 inch bolt pattern. The triangular, 3-bolt hole layout matches the mounting pattern required for this rear main seal conversion, allowing the coupler to bridge the two bolt patterns correctly.\u003c\/p\u003e\u003cp\u003eThe 18-2172 is round in shape with a white finish and weighs 3.88 pounds. Sierra states that this part meets or exceeds the performance of the original equipment part it replaces, and it is backed by Sierra's limited 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 18-2172\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoupler Type:\u003c\/strong\u003e Triangular, 3-Bolt\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Converts 2-piece rear main seal engine (3-1\/2 inch crankshaft bolt pattern) to 1-piece rear main seal engine (3 inch bolt pattern)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShape:\u003c\/strong\u003e Round\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 3.88 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999562463\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eAll GM engines except MC-I, Alpha, and Bravo applications, with triangular, 3-bolt coupler\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e14505A2\u003c\/li\u003e\n\u003cli\u003e38965A1\u003c\/li\u003e\n\u003cli\u003e38965A2\u003c\/li\u003e\n\u003cli\u003e76850A2\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2172 engine coupler replace?\u003c\/strong\u003e It replaces OEM number 14505A2, and it also cross-references to 38965A1, 38965A2, and 76850A2.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich engines is the 18-2172 coupler designed for?\u003c\/strong\u003e The Sierra 18-2172 fits all GM engines except MC-I, Alpha, and Bravo drive applications, and is built for a triangular, 3-bolt coupler pattern.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen would I need this coupler instead of the original one?\u003c\/strong\u003e This coupler is needed when replacing a V6 or V8 engine that has a 2-piece rear main seal with a 3-1\/2 inch crankshaft bolt pattern with a newer engine that has a 1-piece rear main seal and a 3 inch bolt pattern.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2172 coupler weigh?\u003c\/strong\u003e The Sierra 18-2172 engine coupler weighs 3.88 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat shape and color is the coupler?\u003c\/strong\u003e The 18-2172 coupler is round in shape with a white finish.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2172 coupler a direct OEM replacement?\u003c\/strong\u003e Yes, it is a direct replacement for 14505A2 and cross-references to 38965A1, 38965A2, and 76850A2, matching the original triangular 3-bolt mounting pattern.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is in the box with the Sierra 18-2172?\u003c\/strong\u003e One Sierra 18-2172 engine coupler, identified by UPC 030999562463.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-2172 meet OEM performance standards?\u003c\/strong\u003e Yes, Sierra states that the 18-2172 meets or exceeds the performance of the original 14505A2 equipment part it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use the 18-2172 on Alpha or Bravo drive engines?\u003c\/strong\u003e No, the 18-2172 is designed for GM engines and specifically excludes MC-I, Alpha, and Bravo drive applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2172 covered by warranty?\u003c\/strong\u003e Yes, the 18-2172 is covered under Sierra's limited warranty that applies to Sierra parts.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat UPC does the 18-2172 coupler use?\u003c\/strong\u003e The Sierra 18-2172 engine coupler carries UPC 030999562463.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy does a 2-piece to 1-piece rear main seal conversion need a different coupler?\u003c\/strong\u003e Because the crankshaft bolt pattern changes from 3-1\/2 inch to 3 inch between the two rear main seal designs, and the 18-2172's triangular, 3-bolt pattern bridges that difference.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988105605339,"sku":"SIE-18-2172","price":372.87,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2172_lg__25494.1558121506.500.750.jpg?v=1785189003","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-2172-engine-coupler-replaces-mercruiser-14505a2-fits-gm-v-6-v-8-305-350-cid","provider":"Good Vibes Marina","version":"1.0","type":"link"}