451291

John Deere, 450H, Bulldozer Radiator, (IR-AT220497, AT220497, 451291, AT451291)

When your engine's knocking, losing oil pressure, or showing signs of worn main bearings, the heart of the problem is often the crankshaft. This forged replacement crankshaft is built to handle everything from daily chores to season-long harvest marathons. Whether you're rebuilding your trusty old tractor or just trying to get a few more years out of it, a quality crankshaft makes all the difference between a reliable machine and one that leaves you stranded. Key Features Forged steel construction that's stronger than cast iron and handles heavy loads without flexing Includes precision lip seal design that keeps oil where it belongs and dirt out of your engine Single-bolt nose configuration makes pulley and timing gear installation straightforward Compatible with both naturally aspirated and turbocharged Perkins engines Pre-balanced from the factory so you don't need expensive machine shop work Built for Real Farm Work This crankshaft fits a wide range of Massey Ferguson tractors from the smaller 100 series utility machines up through the heavy-duty 600 and 4200 series row-crop tractors. These tractors handle diverse farming operations from field cultivation and hay production to livestock management , and they're powered by proven Perkins 4.236 and 4.248 four-cylinder engines that are known for their durability and fuel efficiency. Made to Last Forged steel construction means this crankshaft can take the abuse that comes with heavy tillage, loader work, and long hours under load. The precision machining ensures proper bearing clearances and oil flow, while the integrated lip seal setup provides better sealing than older rope seal designs. These engines power tractors in demanding applications including heavy tillage, harvesting support, loader work, and continuous PTO operations where reliability is critical . Good to Know This is a complete rebuild job that requires pulling the engine and splitting the case. You'll want to check your main bearing clearances and have the block align-bored if needed. The lip seal requires its own carrier assembly, and don't forget to order new main bearings while you're at it. Most folks find it's worth doing the full rebuild while everything's apart.