{"product_id":"merc-265","title":"Mercury MerCruiser Quicksilver Gearcase Roller Bearing Shim Set 42637A1","description":"\u003cp\u003eMercury MerCruiser Quicksilver 15-42637A1 is a shim set used between the roller bearing and gear housing in select Mercury, Mariner, and MerCruiser gearcase assemblies. Current Mercury parts references list 42637A1 as a \u003cstrong\u003eshim set\u003c\/strong\u003e, not a gasket, and show the latest superseding replacement as \u003cstrong\u003e8M0063267\u003c\/strong\u003e. This shim set is used to help establish correct bearing position and gear housing setup during lower-unit service.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine Mercury \/ Quicksilver-style shim set reference\u003c\/li\u003e\n\u003cli\u003eUsed at the roller bearing to gear housing location\u003c\/li\u003e\n\u003cli\u003eSupports correct gearcase bearing and housing setup\u003c\/li\u003e\n\u003cli\u003eOEM reference: \u003cstrong\u003e15-42637A1\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eCurrent replacement reference: \u003cstrong\u003e8M0063267\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eCatalog shipping reference shows approximately \u003cstrong\u003e0.02 lb\u003c\/strong\u003e with package dimensions around \u003cstrong\u003e2.50 in. x 2.50 in. x 0.25 in.\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eEngine Compatibility\u003c\/h2\u003e\n\u003cp\u003eThis shim set is shown in Mercury parts references for a wide range of select Mercury and Mariner outboard gear housing applications, including various Magnum II, Magnum III, V-115 DFI 2.5L, V-135, and related V6 gearcase assemblies depending on serial number range. Broader cross-reference catalogs also associate this part family with select Mercury \/ Mariner \/ MerCruiser 65–225 HP gearcase applications, including MR, Alpha One, and Alpha One Gen II gear housing component groups.\u003c\/p\u003e\n\u003ch2\u003eSerial Number Fitment Notice\u003c\/h2\u003e\n\u003cp\u003eGearcase shim fitment depends on the exact engine, drive, gear housing, bearing arrangement, rotation, and serial number range. Always confirm compatibility using the engine or drive serial number before ordering, especially where older part number \u003cstrong\u003e15-42637A1\u003c\/strong\u003e has been replaced by \u003cstrong\u003e8M0063267\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch2\u003eWhen This Part Needs Replacement\u003c\/h2\u003e\n\u003cp\u003eReplace or verify this shim set during gear housing rebuilds, roller bearing service, gearcase setup, or when the original shims are damaged, missing, corroded, or no longer suitable for correct bearing preload and gear alignment.\u003c\/p\u003e\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003cp\u003eGearcase shim selection is a precision setup step, not a general gasket replacement. Installation should follow the Mercury service manual procedure for the specific gear housing. Correct measurement, shim stack selection, bearing seating, and gearcase inspection are important for proper lower-unit operation.\u003c\/p\u003e\n\u003ch2\u003eAlternate \/ Superseded Part Numbers\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e15-42637A1\u003c\/li\u003e\n\u003cli\u003e42637A1\u003c\/li\u003e\n\u003cli\u003e15-8M0063267\u003c\/li\u003e\n\u003cli\u003e8M0063267\u003c\/li\u003e\n\u003cli\u003eGLM 23210\u003c\/li\u003e\n\u003cli\u003eSierra 18-2294\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eParts Desk Insight\u003c\/h2\u003e\n\u003cp\u003eThis part number is commonly mistaken for a gasket because it appears in lower-unit service diagrams near other sealing parts. The safer match is by gear housing diagram and serial number, since shims affect bearing and gearcase setup rather than sealing.\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":43563858722852,"sku":"42637A1","price":16.39,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/55f5cf66-4754-4757-aab2-74199c71ceb8.png?v=1777483416","url":"https:\/\/marisolmarine.com\/products\/merc-265","provider":"Marisol Marine Company","version":"1.0","type":"link"}