{"product_id":"sierra-gimbal-bearing-18-2100-mercruiser-omc-volvo-penta","title":"Sierra Gimbal Bearing 18-2100 | MerCruiser \/ OMC \/ Volvo Penta","description":"\u003ch2\u003eSierra Gimbal Bearing 18-2100\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e 18-2100 (Sierra)  |  \u003cstrong\u003eUPC:\u003c\/strong\u003e 030-999-310262\u003c\/p\u003e\n\u003cp\u003eThe Sierra 18-2100 is a heavy-duty, greaseable Link-Belt gimbal bearing designed for the transom assemblies of MerCruiser, OMC Cobra \/ King Cobra, and Volvo Penta sterndrive systems. It supports and aligns the engine-to-sterndrive input shaft as it passes through the transom housing, while allowing controlled angular movement of the drive.\u003c\/p\u003e\n\n\u003ch3\u003eBearing Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction:\u003c\/strong\u003e Link-Belt\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eService type:\u003c\/strong\u003e Greaseable\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside diameter:\u003c\/strong\u003e 3.46 in. \/ 88 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside diameter:\u003c\/strong\u003e 1.38 in. \/ 35 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth:\u003c\/strong\u003e 1.30 in. \/ 33 mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eDimensions are reference fitment values based on the OEM cross-reference bearing family.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eCompatible Applications\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eMerCruiser\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e120 \/ 140 HP  (Serial: 2791957–6225576)\u003c\/li\u003e\n\u003cli\u003e165 HP  (Serial: 2763442 and up)\u003c\/li\u003e\n\u003cli\u003e225-S  (Serial: 3856268–4200499)\u003c\/li\u003e\n\u003cli\u003e228 HP  (Serial: 4782330 and up)\u003c\/li\u003e\n\u003cli\u003e233 HP  (Serial: 4200500 and up)\u003c\/li\u003e\n\u003cli\u003e250 HP  (Serial: 4791300 and up)\u003c\/li\u003e\n\u003cli\u003eR \/ MR\u003c\/li\u003e\n\u003cli\u003eAlpha One\u003c\/li\u003e\n\u003cli\u003eAlpha One Gen II\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/8131409575972\"\u003eBravo One\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/8131409608740\"\u003eBravo Two\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003eBravo Three\u003c\/li\u003e\n\u003cli\u003eBlackhawk\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eOMC\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eOMC Cobra\u003c\/li\u003e\n\u003cli\u003eOMC King Cobra\u003c\/li\u003e\n\u003cli\u003eSelected 1980s–1990s Cobra-family sterndrive applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eVolvo Penta\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDP-S \/ DP-S1\u003c\/li\u003e\n\u003cli\u003eSX-C\u003c\/li\u003e\n\u003cli\u003eSelected SX-M transom shield \/ drive configurations\u003c\/li\u003e\n\u003cli\u003eAssociated 3.0 L, 4.3 L, 5.0 L, 5.7 L, 5.8 L, 7.4 L, and 8.2 L engine applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFitment Notice\u003c\/h3\u003e\n\u003cp\u003eThis bearing spans several generations of MerCruiser, OMC, and Volvo Penta drives. Not every transom assembly uses the same bearing. Before ordering, confirm:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDrive model and generation\u003c\/li\u003e\n\u003cli\u003eEngine or drive serial number\u003c\/li\u003e\n\u003cli\u003eExisting OEM bearing number\u003c\/li\u003e\n\u003cli\u003eTransom assembly type\u003c\/li\u003e\n\u003cli\u003eBearing bore dimensions\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eOEM \u0026amp; Cross-Reference Part Numbers\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eMercury \/ MerCruiser\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e30-60794A2\u003c\/li\u003e\n\u003cli\u003e30-60794A4 → superseded by 30-879194A02\u003c\/li\u003e\n\u003cli\u003e30-60794B4\u003c\/li\u003e\n\u003cli\u003e30-879194A02\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eSee also: \u003ca href=\"\/products\/8131432087588\"\u003eMercury MerCruiser Gimbal Bearing Kit 879194A01\u003c\/a\u003e | \u003ca href=\"\/products\/8131432120356\"\u003eMercury MerCruiser Gimbal Bearing Kit 879194A02\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eOMC\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e983937\u003c\/li\u003e\n\u003cli\u003e3853807\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eVolvo Penta\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e3853807\u003c\/li\u003e\n\u003cli\u003e21752712\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eOther Aftermarket\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eGLM 21900\u003c\/li\u003e\n\u003cli\u003eMallory 9-72410\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhen to Replace the Gimbal Bearing\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eGrowling or rumbling noise from the transom area, especially when turning under power\u003c\/li\u003e\n\u003cli\u003eBearing feels rough or catches when rotated by hand\u003c\/li\u003e\n\u003cli\u003eExcessive radial play in the input shaft\u003c\/li\u003e\n\u003cli\u003eVisible corrosion, water intrusion, or grease contamination\u003c\/li\u003e\n\u003cli\u003eEngine-to-drive alignment cannot be maintained due to bearing wear\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eInstallation Notes\u003c\/h3\u003e\n\u003cp\u003eGimbal bearing replacement requires sterndrive removal. During service:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eInspect bellows for cracking or water intrusion — see \u003ca href=\"\/products\/11077660180516\"\u003eU-Joint Bellows\u003c\/a\u003e and \u003ca href=\"\/products\/8131437723684\"\u003eMerCruiser Bellows Assembly 8M0062406\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003eInspect input shaft and U-joints\u003c\/li\u003e\n\u003cli\u003eCheck bearing bore and retaining components\u003c\/li\u003e\n\u003cli\u003eInstall bearing squarely into the transom housing\u003c\/li\u003e\n\u003cli\u003eAlign grease passage correctly on greaseable installations\u003c\/li\u003e\n\u003cli\u003eLubricate with specified marine grease\u003c\/li\u003e\n\u003cli\u003eVerify engine alignment with the correct alignment tool before reinstalling the drive\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIncorrect engine alignment after installation accelerates wear on both the gimbal bearing and drive coupler.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Parts\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/11077659787300\"\u003eSierra 18-21006 Gimbal Bearing – MerCruiser Bravo \u0026amp; Gen II Sterndrive\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/8131432087588\"\u003eMercury MerCruiser Gimbal Bearing Kit 879194A01 | Alpha One\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/8131432120356\"\u003eMercury MerCruiser Gimbal Bearing Kit 879194A02 | Alpha One\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/11119998795812\"\u003eSierra Transom Seal Kit – 47-8205\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/11119998697508\"\u003eSierra Transom Seal Kit – 47-27721\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/11119998828580\"\u003eSierra Transom Seal Kit – 47-82061\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/11077660442660\"\u003eOMC Bellows Kit\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/11077660082212\"\u003eVolvo Drive Bellows Kit\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/11077660278820\"\u003eOMC Sterndrive\/Cobra Exhaust Bellows\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/8131516694564\"\u003eVolvo Penta Bellows Kit 876294\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/8131402006564\"\u003eMercury Quicksilver Gimbal Housing Lock Nut 11-34087\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/11119998926884\"\u003eQuicksilver 94996Q2 Bell Housing Gasket Kit – MerCruiser R, MR \u0026amp; Alpha One Gen II\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/11119998435364\"\u003eSierra Cobra Outdrive Mounting Gasket Set (47-2613)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eParts Desk Insights\u003c\/h3\u003e\n\u003cp\u003eThe Sierra 18-2100 covers one of the most common transom bearing interchange families across three major sterndrive brands. Customers most often need this bearing after noticing a growling or grinding noise from the back of the boat at low RPM or during tight turns — classic gimbal bearing wear symptoms that worsen over time if ignored.\u003c\/p\u003e\n\u003cp\u003eThe most reliable way to confirm this is the right bearing: check whether the existing bearing or OEM number cross-references to MerCruiser 30-879194A02, OMC 3853807, or Volvo Penta 21752712. If it does, 18-2100 is in the correct interchange family. Always double-check the transom assembly and drive serial before finalizing the order, particularly on Volvo Penta SX-M configurations, which can use different bearings depending on the transom shield version.\u003c\/p\u003e","brand":"LNS","offers":[{"title":"Default Title","offer_id":51037541335076,"sku":"47-2100","price":125.79,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/images_270eadbc-6b05-480a-8623-fbb99ec7b197.jpg?v=1788805749","url":"https:\/\/marisolmarine.com\/products\/sierra-gimbal-bearing-18-2100-mercruiser-omc-volvo-penta","provider":"Marisol Marine Company","version":"1.0","type":"link"}