Description

When you’re hearing that telltale knocking from the bottom end of your engine, it’s time to face the music—those connecting rod bearings are crying for help. This bearing set is engineered specifically for Perkins AD4.203 engines and gives you the precision .010″ undersized bearings you need when your crankshaft journals have been turned down during a rebuild. Don’t take shortcuts with bargain bearings when your engine’s life depends on proper lubrication and fit.

What You’re Getting

Complete set of .010″ undersized connecting rod bearings for all cylinders
Precision-manufactured to exact tolerances for proper oil clearance
High-quality steel backing with specialized bearing material overlay
Engineered to handle the stress and heat cycles of diesel engine operation

Built for Real Farm Work

These bearings fit Perkins AD4.203 engines commonly found in Massey Ferguson 40B and 50 series tractors along with various White and other agricultural equipment. Whether your tractor’s powering through spring tillage, running a hay baler all day, or handling loader duties around the barn, these bearings keep your connecting rods spinning smooth under all that torque and vibration.

Made to Last

Engine bearings take tremendous abuse—constant rotation under heavy loads, oil contamination, and temperature swings that would destroy ordinary parts. These bearings use advanced materials and manufacturing processes designed specifically for diesel engine applications. The steel backing provides strength while the bearing surface offers the right balance of durability and conformability to handle minor imperfections in your machined crankshaft.

Good to Know

This is definitely a job for someone with engine rebuilding experience. Make sure your crankshaft has been properly turned .010″ undersize and polished to the right finish. Check your oil clearances with Plastigage before final assembly, and always replace the rod bolts at the same time. A word from the shop: if you’re going this deep into the engine, it’s worth doing the main bearings too while everything’s apart.