Description

When your tractor’s been running for thousands of hours and you start hearing that telltale knocking sound from deep in the engine, it’s time to address those worn main bearings before they turn a repair job into a complete rebuild. This main bearing set includes everything you need to restore proper clearances and get your three-cylinder diesel running smooth and quiet again.

What You’re Getting

Complete set with both standard and flanged thrust bearings for proper engine assembly
Precision-manufactured bearings that maintain proper oil clearances and crankshaft support
Standard size kit that replaces original John Deere bearings AT21139 and AT21140
High-quality TISCO construction built to handle the demands of agricultural work
One complete kit services both naturally aspirated and turbocharged 179 CID engines

Built for Real Farm Work

This bearing set fits the reliable 152, 164, and 179 cubic inch three-cylinder diesel engines that powered many John Deere tractors through the years. These engines were workhorses in utility tractors, compact models, and smaller row-crop machines that handled everything from loader work to field cultivation. Whether your tractor’s been pulling implements, running a PTO-driven baler, or doing daily chores around the farm, these engines were built to last with proper maintenance.

Made to Last

Main bearings take the full load of the crankshaft and connecting rods, so they need to be manufactured to precise tolerances. These TISCO bearings are built with the same specifications as the original John Deere parts, using quality bearing material that can handle the constant loading and unloading cycles of diesel engine operation.

Installation Notes

Engine bearing replacement requires proper measuring tools and torque specifications – this isn’t a job for the field. Check your crankshaft for scoring or out-of-round conditions before installing new bearings. The flanged thrust bearings control crankshaft end play, so proper positioning and clearance checking are critical for long engine life.