Description

When you start hearing that telltale knocking from deep inside your tractor’s engine, it’s time to get serious about a rebuild before things get expensive fast. This standard main bearing set is what you need to restore your AD3-152 Perkins three-cylinder diesel engine back to smooth, quiet operation. Whether you’re tackling a complete rebuild or just refreshing worn bearings, this kit gives you the precision components to get that engine running like new again.

What You’re Getting

Complete main bearing set designed specifically for the AD3-152’s crankshaft requirements
Standard size bearings for engines that haven’t been previously machined or oversized
Quality construction that handles the loads and pressures of diesel operation
Direct replacement for both Massey Ferguson and Allis Chalmers applications
TISCO brand quality that mechanics trust for critical engine components

Built for Real Farm Work

The AD3-152 engine has been powering farm work for decades, from the legendary Massey Ferguson 135 tractors that became one of the most popular utility tractors ever built to various Allis Chalmers models. These versatile utility tractors excel in diverse farming applications including cultivation, planting, mowing, hay production, livestock management, and general farm utility work. When your three-cylinder engine is running right, it delivers reliable power for loader work, field operations, and everything in between.

Made to Last

Main bearings are literally what keep your crankshaft spinning smoothly under pressure. These bearings are engineered to handle the combustion forces and side loads that come with diesel operation. The standard size specification means they’re designed for engines that are still within original tolerances, giving you the proper clearances for oil flow and heat dissipation that keep everything running cool and quiet.

Good to Know

Installing main bearings is serious engine work that requires splitting the tractor and pulling the oil pan, so it’s typically a complete teardown job. Check your crankshaft journals for wear and measure clearances before installation—if the crank has been turned undersize, you’ll need oversized bearings instead. Always replace the oil pump and check rod bearings while you’ve got everything apart. This is also the perfect time to inspect and replace rear main seals and other engine gaskets.