{"product_id":"merc-297","title":"Mercury MerCruiser Driveshaft Bearing Cup Shim Set - 15-45691A1","description":"\u003cp\u003eThe Mercury MerCruiser Quicksilver \u003cstrong\u003e15-45691A1\u003c\/strong\u003e is a genuine Mercury Marine OEM \u003cstrong\u003eshim set\u003c\/strong\u003e used for select vintage MerCruiser gear housing service applications. This shim set is used to adjust the installed position of the driveshaft bearing cup within the gear housing, helping establish the correct gear alignment, bearing preload, and gear tooth contact pattern during lower-unit service. It should be used only where the MerCruiser gear housing diagram or service procedure specifically calls for \u003cstrong\u003e45691A1 \/ 15-45691A1\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine Mercury Marine factory OEM shim set.\u003c\/li\u003e\n\u003cli\u003eMercury\/MerCruiser part number: \u003cstrong\u003e15-45691A1\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eManufacturer part number: \u003cstrong\u003e45691A1\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eGTIN\/UPC: \u003cstrong\u003e745061153011\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eUsed for driveshaft bearing cup and gear housing shimming service where specified.\u003c\/li\u003e\n\u003cli\u003eShim thicknesses commonly associated with this set include \u003cstrong\u003e0.002 in., 0.003 in., 0.005 in., and 0.010 in.\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eHelps fine-tune bearing cup position, gear mesh, and internal tolerance setup during gearcase service.\u003c\/li\u003e\n\u003cli\u003eIntended for precision service work, not general hardware spacing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eApplication Compatibility\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eCommon application context includes select vintage MerCruiser sterndrive gear housing assemblies by serial number and service diagram, including:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMerCruiser Model 90 Renault 96 I\/L4\u003c\/strong\u003e applications where specified\u003c\/li\u003e\n\u003cli\u003eEarly \u003cstrong\u003e1970–1972 inline 4-cylinder MerCruiser\u003c\/strong\u003e drive configurations where the gear housing service procedure calls for this shim set\u003c\/li\u003e\n\u003cli\u003eDriveshaft bearing cup-to-gear housing shim locations requiring \u003cstrong\u003e15-45691A1 \/ 45691A1\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eUse this shim set only where the MerCruiser lower-unit or gear housing parts diagram specifically calls for \u003cstrong\u003e15-45691A1\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eFitment Notice\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eConfirm fitment by drive model, serial number, gear housing assembly, bearing cup location, and exact MerCruiser service procedure before ordering. Gearcase shims are selected by measurement, preload, and gear contact requirements; they should not be chosen by outside diameter or general appearance alone.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eWhen This Part Needs Replacement\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eReplace or install this shim set during gearcase teardown when the original shim stack is missing, damaged, corroded, distorted, or no longer produces the correct bearing preload or gear tooth pattern. Shims may also be required when replacing the driveshaft bearing cup, gear housing, bearing components, gearset, or related lower-unit internal parts.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eInstallation Notes\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eMeasure the existing shim stack before disassembly when possible and keep original shim locations organized. Final shim thickness must be selected according to the MerCruiser service manual using the correct measuring tools and gearcase setup procedure. Do not guess shim thickness. Incorrect shimming can cause noisy operation, poor gear contact, overheating, accelerated bearing wear, or gear failure.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eAlternate\/Superseded Part Numbers\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e15-45691A1\u003c\/strong\u003e — Mercury\/MerCruiser formatted part number\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e45691A1\u003c\/strong\u003e — Manufacturer part number\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSierra 18-2283\u003c\/strong\u003e — aftermarket cross-reference; verify by application\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGLM 23260\u003c\/strong\u003e — aftermarket cross-reference; verify by application\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eParts Desk Insight\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eShim sets are precision setup parts, not simple replacement washers. The correct combination of shim thicknesses determines gear alignment and bearing preload, so this kit should be installed as part of a measured gearcase setup procedure rather than by matching the old stack blindly.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eShipping:\u003c\/strong\u003e Ships same or next day for fast Canada wide shipping. ⚓\u003c\/p\u003e","brand":"MERC","offers":[{"title":"Default Title","offer_id":43563860099108,"sku":"45691A1","price":21.33,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/212bd0fa-e243-4cbf-9c06-ce6dba71d422.png?v=1781051385","url":"https:\/\/marisolmarine.com\/products\/merc-297","provider":"Marisol Marine Company","version":"1.0","type":"link"}