{"product_id":"mercury-mercruiser-pinion-stud-8m0113182","title":"Mercury MerCruiser Quicksilver Pinion Stud 8M0113182 | 7\/16-20 Stainless Steel","description":"\u003ch2\u003eMercury MerCruiser Quicksilver Pinion Stud 8M0113182\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 8M0113182 (service format: 43-8M0113182)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mercury Marine \/ MerCruiser \/ Quicksilver\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOfficial Product Type:\u003c\/strong\u003e Pinion Stud\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Stainless steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread:\u003c\/strong\u003e 7\/16-20\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGTIN:\u003c\/strong\u003e 745061324572\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupersedes:\u003c\/strong\u003e 818381, 8183811, 8183812 (confirmed Mercury supersession chain)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaced By:\u003c\/strong\u003e No further confirmed supersession — 8M0113182 is current\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem:\u003c\/strong\u003e Accessory drive \/ idler-pulley assembly\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhat This Part Does\u003c\/h2\u003e\n\u003cp\u003eThe Mercury Marine 8M0113182 is a genuine OEM stainless-steel pinion stud used as mounting hardware within the \u003cstrong\u003eidler-pulley and accessory-belt drive assembly\u003c\/strong\u003e on selected MerCruiser gasoline engines. Despite the catalog name “Pinion Stud,” this part is shown in engine diagrams alongside the idler pulley, bushing, and retaining nut — not in the sterndrive gearcase. It is the current replacement for earlier stud numbers 818381, 8183811, and 8183812.\u003c\/p\u003e\n\n\u003ch2\u003eCompatible Applications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e420 GM 454 V8\u003c\/li\u003e\n\u003cli\u003e425 GM 454 V8\u003c\/li\u003e\n\u003cli\u003e465 GM 502 V8\u003c\/li\u003e\n\u003cli\u003e500 GM 502 V8\u003c\/li\u003e\n\u003cli\u003e525 SC GM 454 V8\u003c\/li\u003e\n\u003cli\u003e454 EFI Ski\u003c\/li\u003e\n\u003cli\u003e7.4L MIE\u003c\/li\u003e\n\u003cli\u003e7.4L MIE MPI\u003c\/li\u003e\n\u003cli\u003e8.2L MIE\u003c\/li\u003e\n\u003cli\u003e454 MAG Bravo\u003c\/li\u003e\n\u003cli\u003e502 MAG Bravo\u003c\/li\u003e\n\u003cli\u003eLater MerCruiser accessory-drive assemblies using idler pulleys \u003cstrong\u003e807757T\u003c\/strong\u003e or \u003cstrong\u003e864625T\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eConfirm the engine model, serial number, and accessory-drive parts diagram before ordering. Mercury used several belt and idler-pulley configurations across big-block engine families, and the correct stud depends on the installed bracket and pulley setup.\u003c\/p\u003e\n\n\u003ch2\u003eSuperseded Part Numbers\u003c\/h2\u003e\n\u003cp\u003eConfirmed Mercury supersession chain: \u003cstrong\u003e818381 → 8M0113182\u003c\/strong\u003e, \u003cstrong\u003e8183811 → 8M0113182\u003c\/strong\u003e, \u003cstrong\u003e8183812 → 8M0113182\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eIf your parts diagram or existing hardware shows any of these earlier numbers, 8M0113182 is the current service replacement.\u003c\/p\u003e\n\n\u003ch2\u003eWhen to Replace This Stud\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eThreads are damaged, stripped, or corroded\u003c\/li\u003e\n\u003cli\u003eThe stud is bent or distorted\u003c\/li\u003e\n\u003cli\u003eThe idler pulley or bushing shows excessive movement caused by loose or damaged mounting hardware\u003c\/li\u003e\n\u003cli\u003eThe stud is damaged during accessory-drive service or pulley removal\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eInspect the idler-pulley bushing and bearing before reassembly\u003c\/li\u003e\n\u003cli\u003eCheck the retaining nut and washer condition\u003c\/li\u003e\n\u003cli\u003eConfirm the correct belt routing before final assembly\u003c\/li\u003e\n\u003cli\u003eTighten to Mercury service specifications\u003c\/li\u003e\n\u003cli\u003eVerify the pulley rotates freely without side play after assembly\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eRelated Components\u003c\/h2\u003e\n\u003cp\u003eThis stud is typically serviced alongside the following components in the accessory-drive assembly:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e865193\u003c\/strong\u003e — Bushing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e859135\u003c\/strong\u003e — Retaining nut\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e807757T \/ 864625T\u003c\/strong\u003e — Idler pulley (application dependent)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e20084\u003c\/strong\u003e — Washer (selected configurations)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eTechnical FAQ\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs this a gearcase or sterndrive pinion stud?\u003c\/strong\u003e\u003cbr\u003eNo. Despite the Mercury catalog name “Pinion Stud,” 8M0113182 is shown in engine accessory-drive diagrams mounting the idler pulley and belt system — not in the sterndrive gearcase. Do not use it as a gearcase component.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes 8M0113182 replace 818381?\u003c\/strong\u003e\u003cbr\u003eYes. The confirmed Mercury supersession chain is 818381 \/ 8183811 \/ 8183812 → 8M0113182. All three earlier numbers are replaced by the current 8M0113182.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat thread specification is this stud?\u003c\/strong\u003e\u003cbr\u003e7\/16-20. Confirm this against the existing stud and assembly before ordering, as Mercury accessory-drive assemblies use several different hardware specifications across engine generations.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eShould I replace other components when replacing this stud?\u003c\/strong\u003e\u003cbr\u003eIt is good practice to inspect the idler-pulley bushing (865193) and retaining nut (859135) at the same time. A worn bushing can cause belt misalignment and accelerated wear even after the stud is replaced.\u003c\/p\u003e\n\n\u003ch2\u003eRelated Parts\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/8131403087908\"\u003eMercury MerCruiser Pinion Nut 11-35921\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/11167581274148\"\u003eMercury MerCruiser Quicksilver Gear Housing Shim Set 8M0063267\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/8131401416740\"\u003eMercury Gearcase Shim Set 15-32563A1\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eParts Desk Insights\u003c\/h2\u003e\n\u003cp\u003eThe most important thing to know about 8M0113182 is its \u003cstrong\u003eactual location in the engine\u003c\/strong\u003e: it mounts the idler pulley in the front accessory-drive system, not in the sterndrive or gearcase. Customers occasionally look for it in the wrong diagram because of the “Pinion Stud” name. When ordering, match by engine model and serial number first, then confirm against the accessory-drive or serpentine-belt diagram. If you are replacing this stud due to idler-pulley wobble or belt alignment issues, always inspect the bushing and retaining nut at the same time — these wear together and are inexpensive to replace as a set.\u003c\/p\u003e","brand":"MERC","offers":[{"title":"Default Title","offer_id":43563915411492,"sku":"8M0113182","price":8.44,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/8M0113182.png?v=1771545679","url":"https:\/\/marisolmarine.com\/products\/mercury-mercruiser-pinion-stud-8m0113182","provider":"Marisol Marine Company","version":"1.0","type":"link"}