When your engine starts knocking or you're losing oil pressure, those main bearings are telling you they've reached the end of the road. There's no working around worn main bearings - they keep your crankshaft centered and spinning smoothly, and when they go bad, your whole engine's in trouble. These standard-size main end bearings get your tractor's heart beating strong again. What You're Getting Standard-size bearings that restore proper crankshaft clearances without machine work Precision-manufactured to handle the loads these three-cylinder engines put out Quality materials that resist the heat and pressure of hard farm work Complete set gives you everything needed for both main bearing positions Built for Real Farm Work These bearings fit the reliable Perkins A3.152 and AD3.152 engines that power classic Massey Ferguson tractors like the 35, 135, 240, 250, 340, 350, 352, and 550. These three-cylinder workhorses have been the backbone of small to medium farms for decades, handling everything from cultivation to hay production to loader work. Made to Last Engine bearings take a beating - they're constantly under pressure, dealing with combustion forces and the weight of that spinning crankshaft. These bearings are manufactured to precise tolerances and use materials designed to handle the demanding conditions inside your engine. When properly installed with clean oil and correct clearances, they'll give you thousands more hours of reliable service. Good to Know Installing main bearings means splitting the tractor, so this is typically a job for winter when you've got time for a complete engine rebuild. Always check bearing clearances with Plastigauge and make sure your crankshaft journals are in good shape before installation. Clean assembly is critical - any dirt or debris will destroy new bearings quickly.