Description

When you’re hearing that telltale knocking from deep inside your Allis Chalmers engine or noticing oil pressure that’s not what it used to be, those main bearings are probably telling you it’s time for some attention. Engine bearings must be ordered separately from rebuild kits, so this standard size main bearing set gets you exactly what you need to restore proper crankshaft support in your 125 cubic inch four-cylinder gas engine.

What You’re Getting

Complete main bearing set in standard size for proper crankshaft clearances
Precision-manufactured bearings designed to handle the loads of farm work
Direct replacement for worn original bearings – no machining required on standard cranks
Quality construction that restores proper oil pressure and eliminates knock

Built for Real Farm Work

This bearing set fits the 125 CID four-cylinder gas engines found in many classic Allis Chalmers tractors from the era when orange iron ruled the farmyard. These were the workhorses pulling cultivators, running hay equipment, and handling the day-to-day chores that kept farms running. Whether you’re restoring a vintage WC or keeping a working tractor in the field, proper main bearings are the foundation of a reliable engine.

Made to Last

Main bearings take a beating – they support the entire crankshaft while dealing with combustion pressures, temperature swings, and constant rotation. These bearings are manufactured to handle the stresses of agricultural work, providing the smooth operation and long service life your Allis Chalmers engine was designed for.

Good to Know

Installing main bearings requires removing the engine oil pan and unbolting the main bearing caps – it’s a job best done with the engine out of the tractor for proper access. Check your crankshaft journals for wear and scoring before installation, and always use a torque wrench when reassembling the main caps. Fresh oil and a new filter are essential after any bearing work.