Description

When you’re hearing knocks or rattles from deep in your engine, or oil pressure isn’t what it used to be, worn main bearings are often the culprit. These critical components keep your crankshaft properly positioned and spinning smoothly, but they take a beating over thousands of hours of operation. This TISCO main bearing set gets your engine back to running like it should with precision-made bearings that meet original specifications.

What You’re Getting

Complete main bearing set with thrust bearings included for a full rebuild
Proper bearing locating tabs positioned off-center on top halves, centered on lower halves for correct installation
Standard size bearings that provide the right clearance for rebuilt engines
Quality construction that handles the heat, pressure, and constant rotation of farm work

Built for Real Farm Work

This bearing set fits the workhorse 254 CID and 270 CID 4-cylinder diesel engines found in many John Deere tractors from the 4030 through 4240 series. These were the reliable power plants that handled everything from loader work to heavy tillage, and this bearing set keeps them running strong for years to come.

Made to Last

TISCO bearings are manufactured to handle the demanding conditions these engines face day after day. The materials and tolerances are designed to provide proper oil clearance while standing up to the heat cycles and loads that come with long days in the field.

Good to Know

Installing main bearings requires careful attention to torque specifications and proper assembly procedures. Make sure the bearing tabs are positioned correctly and check your clearances before final assembly. It’s also a good time to inspect your crankshaft journals and consider having them polished if needed.