When your engine starts knocking like there's a hammer loose in the block, you know it's rebuild time. This heavy-duty replacement crankshaft is the heart of your Perkins 1004.40 engine rebuild, converting all that diesel combustion into the power that gets your work done. Whether you've got worn journals, spun bearings, or discovered cracks during maintenance, this forged crank gets your engine back to earning its keep instead of taking up valuable shop space. What You're Getting Direct OEM replacement for both 1004.40 Blue and 1004.40TW Green engine variants Heavy-duty forged construction that weighs over 66 pounds - built to handle serious workloads Precision-ground journals deliver smooth operation and extend bearing life Matches original specifications perfectly for proper fit with existing components Ships freight due to weight - plan your delivery timing accordingly Built for Real Farm Work These Perkins 1004.40 engines power countless Massey Ferguson, Case, and other tractors that form the backbone of working farms across the country. From field cultivation to heavy loader work, these engines take incredible punishment spinning thousands of times per minute while handling combustion forces that would destroy lesser components. This replacement crank uses the same forging process and heat treatment that made Perkins famous for reliability. Made to Last Quality matters when you're this deep into an engine rebuild. This forged crankshaft features the same metallurgy and manufacturing standards as the original Perkins part, ensuring it can handle the stress of heavy fieldwork for years to come. The precision-ground journals provide the proper surface finish for optimal bearing contact and oil film retention. Good to Know A crankshaft replacement means you're committed to a complete rebuild - make it count. Have your machine shop check the new crank's dimensions and verify bearing clearances before assembly. Clean the block thoroughly, check for cracks, and consider having it bored if needed. Pre-lube all bearings with assembly paste during installation, follow proper torque sequences, and check end play. With quality parts like this and careful assembly, you'll get another generation of reliable service from that trusty tractor.