{"product_id":"volvo-penta-21827365-shaft-coupling","title":"Volvo Penta 21827365 Shaft Coupling – 25mm Clamp-Type Inboard","description":"\u003cp\u003eVolvo Penta 21827365 is a genuine OEM clamp-type propeller shaft coupling for \u003cstrong\u003e25 mm shaft diameter\u003c\/strong\u003e inboard driveline installations. This two-piece conic coupling provides central alignment and strong torsional hold without shaft damage, and is designed for installation without tapering or keyway cutting.\u003c\/p\u003e\n\n\u003ch2\u003ePart Information\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 21827365\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Volvo Penta\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOfficial Product Type:\u003c\/strong\u003e Propeller Shaft Coupling (Clamp-Type, OEM)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupersedes:\u003c\/strong\u003e 827924, 827925\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaced By:\u003c\/strong\u003e No current supersession — 21827365 is the active OEM number\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eDimensions \u0026amp; Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eShaft Diameter:\u003c\/strong\u003e 25 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength:\u003c\/strong\u003e ~63 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiameter:\u003c\/strong\u003e ~102 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e ~3.1 kg\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRequired Shaft Tolerance:\u003c\/strong\u003e h9 (0 to −0.052 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDesign:\u003c\/strong\u003e Two-piece conic, clamp-type — no taper machining or keyway required\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatible Applications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eVolvo Penta D1 engines with MS10 gearbox\u003c\/li\u003e\n\u003cli\u003eVolvo Penta D1 engines with MS15 gearbox\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eFitment can vary by engine version, gearbox, shaft diameter, and driveline configuration. Always confirm part number 21827365 against your exact engine serial number, gearbox model, and shaft size before ordering — especially on vessels with prior shaft, gearbox, or coupling changes.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch2\u003eWhen to Replace\u003c\/h2\u003e\n\u003cp\u003eReplace this coupling when you notice fretting, distortion, loosening, corrosion, vibration-related wear, or damage from driveline misalignment. It is also the correct replacement part when rebuilding or upgrading a driveline where the shaft diameter and gearbox match this specification.\u003c\/p\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003cp\u003eProper shaft preparation, correct shaft tolerance (h9), and careful driveline alignment are essential during installation. The two-piece conic design simplifies the process by eliminating taper machining and keyway cutting, but the shaft must still be within the specified tolerance range for the coupling to seat and hold correctly.\u003c\/p\u003e\n\n\u003ch2\u003eAlternate \u0026amp; Superseded Part Numbers\u003c\/h2\u003e\n\u003cp\u003eEarlier part numbers \u003cstrong\u003e827924\u003c\/strong\u003e and \u003cstrong\u003e827925\u003c\/strong\u003e have been updated to \u003cstrong\u003e21827365\u003c\/strong\u003e. Use 21827365 as the current OEM ordering number.\u003c\/p\u003e\n\n\u003ch2\u003eParts Desk Insights\u003c\/h2\u003e\n\u003cp\u003eShaft couplings are a common source of driveline vibration complaints. The most frequent issue is ordering by engine model alone without confirming the shaft diameter — a near-match coupling that is slightly off on shaft size will not seat correctly and can cause alignment problems or premature wear. Best practice is to verify the shaft diameter and gearbox model directly before ordering. This part is best suited for D1 inboard driveline rebuilds and coupling replacements where the original 25 mm clamp-type specification applies.\u003c\/p\u003e","brand":"VOL","offers":[{"title":"Default Title","offer_id":43563989827620,"sku":"21827365","price":728.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/21827365.png?v=1772423386","url":"https:\/\/marisolmarine.com\/products\/volvo-penta-21827365-shaft-coupling","provider":"Marisol Marine Company","version":"1.0","type":"link"}