{"product_id":"merc-13","title":"Mercury MerCruiser Quicksilver Cotter Pin 34212 | Superseded to 54929","description":"\u003ch2\u003eMercury MerCruiser Quicksilver Cotter Pin 34212 | Superseded to 54929\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eOriginal Part Number:\u003c\/strong\u003e 34212 (service format: 18-34212)\u003cbr\u003e\n\u003cstrong\u003eCurrent Replacement:\u003c\/strong\u003e 54929 (service format: 18-54929)\u003cbr\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mercury \/ Quicksilver\u003cbr\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e OEM Cotter Pin \/ Retaining Pin\u003cbr\u003e\n\u003cstrong\u003eSystem:\u003c\/strong\u003e MerCruiser Steering \u0026amp; Transom \/ Gimbal Housing\u003cbr\u003e\n\u003cstrong\u003eQuantity Required:\u003c\/strong\u003e 1 per applicable assembly\u003cbr\u003e\n\u003cstrong\u003eGTIN (34212):\u003c\/strong\u003e 745061137042 | \u003cstrong\u003eGTIN (54929):\u003c\/strong\u003e 745061159587\u003cbr\u003e\n\u003cstrong\u003eApproximate Weight:\u003c\/strong\u003e 5 g\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eWhat This Part Does\u003c\/h3\u003e\n\u003cp\u003eThe 34212 is a genuine Mercury OEM cotter pin used to retain the lower swivel pin in MerCruiser gimbal-housing assemblies and in selected power-steering actuator and steering sleeve applications. As a locking component, it prevents the swivel pin from backing out under load and vibration. Mercury has superseded 34212 to current cotter pin \u003cstrong\u003e54929\u003c\/strong\u003e — if your parts manual lists 34212, 54929 is the current ordering number.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eThis is not a propeller cotter pin. 34212 \/ 54929 is specifically documented in MerCruiser steering and transom hardware — confirm the exact assembly and diagram position before ordering.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eCompatible Applications\u003c\/h3\u003e\n\u003cp\u003eConfirm the exact MerCruiser drive, transom assembly, and steering diagram before ordering. Mercury uses several different cotter pins in nearby steering and transom hardware.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMerCruiser gimbal housing \/ gimbal ring assemblies — lower swivel-pin retaining position\u003c\/li\u003e\n\u003cli\u003eMerCruiser power-steering cylinder \/ actuator assemblies\u003c\/li\u003e\n\u003cli\u003eSteering sleeve and related steering linkage assemblies\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFitment Notice\u003c\/h3\u003e\n\u003cp\u003eMercury uses several different cotter pins in nearby steering and transom locations. For example, cotter pin \u003cstrong\u003e46950\u003c\/strong\u003e appears on selected clevis-pin positions, while \u003cstrong\u003e34212 \/ 54929\u003c\/strong\u003e is used at the lower swivel-pin or steering-sleeve location. Confirm by the exact diagram position and assembly before ordering.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Assembly Components\u003c\/h3\u003e\n\u003cp\u003eIn lower swivel-pin applications, Mercury diagrams commonly show the following components at the same assembly position:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e8M0073409 — Lower swivel pin\u003c\/li\u003e\n\u003cli\u003e54929 — Cotter pin (current number for 34212)\u003c\/li\u003e\n\u003cli\u003e32518 — Lower swivel-pin washer\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eInspect the lower swivel pin, gimbal-ring and gimbal-housing bores, washer, and surrounding corrosion when replacing the cotter pin.\u003c\/p\u003e\n\n\u003ch3\u003eWhen to Replace\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCotter pin has been removed during any steering or transom service\u003c\/li\u003e\n\u003cli\u003ePin legs are fatigued, repeatedly bent, or distorted\u003c\/li\u003e\n\u003cli\u003eCorrosion is visible on the pin\u003c\/li\u003e\n\u003cli\u003eLower swivel pin or steering hardware is being serviced\u003c\/li\u003e\n\u003cli\u003ePin is missing from the assembly\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eA cotter pin is a single-use locking component — do not reuse a pin that has been removed or bent. Replace it any time the assembly is disturbed.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eInstallation Notes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eInstall the replacement cotter pin in the same orientation shown in the applicable Mercury MerCruiser service diagram\u003c\/li\u003e\n\u003cli\u003eBend the legs to lock the pin in place — do not over-bend to the point of stress cracking the pin material\u003c\/li\u003e\n\u003cli\u003eWhile the assembly is apart, inspect the lower swivel pin for wear, corrosion, or scoring and replace if necessary\u003c\/li\u003e\n\u003cli\u003eApply corrosion protection to the swivel pin and surrounding hardware per the Mercury service procedure\u003c\/li\u003e\n\u003cli\u003eFollow the applicable Mercury MerCruiser service manual for torque specifications and reassembly sequence\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003ePart Number Cross-Reference\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOriginal OEM:\u003c\/strong\u003e 34212 \/ 18-34212\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCurrent replacement:\u003c\/strong\u003e 54929 \/ 18-54929\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupersession:\u003c\/strong\u003e 34212 → 54929\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdditional earlier references (same cotter pin family):\u003c\/strong\u003e 34159, 24552, 49324\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGTIN (34212):\u003c\/strong\u003e 745061137042\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGTIN (54929):\u003c\/strong\u003e 745061159587\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical FAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the current replacement for 34212?\u003c\/strong\u003e\u003cbr\u003eA: Mercury has superseded 34212 to \u003cstrong\u003e54929\u003c\/strong\u003e (service format 18-54929). If your parts manual, diagram, or older order history shows 34212, order 54929 as the current equivalent.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can I reuse the old cotter pin?\u003c\/strong\u003e\u003cbr\u003eA: No. Cotter pins are single-use locking components. Once removed and bent back, the metal is fatigued and the pin will not provide reliable retention. Replace with a new 54929 any time the assembly is opened.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is this the same as a propeller cotter pin?\u003c\/strong\u003e\u003cbr\u003eA: No. Mercury uses different cotter pins at different locations. The 34212 \/ 54929 is specifically documented in MerCruiser steering and gimbal-housing assemblies. Propeller shaft cotter pins are a different Mercury part number. Always confirm by diagram position.\u003c\/p\u003e\n\n\u003ch3\u003eParts Desk Insights\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eBest use case:\u003c\/strong\u003e Order 54929 (the current number for legacy 34212) when servicing a MerCruiser gimbal housing, lower swivel pin, or steering assembly where the existing cotter pin was removed or is showing corrosion. Keep a spare in the tool kit — a cotter pin is always a single-use part and should be replaced every time the assembly is opened.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCommon issues:\u003c\/strong\u003e The most common mistake is reusing the old cotter pin after reassembly, which risks the swivel pin backing out under load. A second common issue is ordering by the legacy number 34212 when the current service number 54929 is what dealers stock — both refer to the same current part. Also confirm the diagram position: Mercury uses different cotter pins at nearby locations in the same steering and transom assembly, and ordering the wrong one is an easy error without checking the diagram.\u003c\/p\u003e","brand":"MERC","offers":[{"title":"Default Title","offer_id":51324677783588,"sku":"34212","price":8.94,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/images_b14a10fb-be86-428f-9796-398cbbc921af.png?v=1788724027","url":"https:\/\/marisolmarine.com\/products\/merc-13","provider":"Marisol Marine Company","version":"1.0","type":"link"}