Description

When your Allis Chalmers starts knocking or you notice oil pressure dropping, worn camshaft bearings are often the culprit. These bearings support the camshaft as it rotates thousands of times per minute, opening and closing valves with precise timing. When they wear out, you’ll hear it first thing in the morning on cold starts—that telltale knock that means it’s time for new bearings before things get worse.

What You’re Getting

Precision-machined bearing shells that restore proper clearances and oil flow
High-quality bronze construction designed to handle the loads and heat of farm work
Exact fit for 125, 138, and 149 cubic inch four-cylinder gas engines
Set includes the right quantity—three bearings for 125 CID engines, two for 138 and 149 CID engines

Built for Real Farm Work

These bearings fit the reliable four-cylinder gas engines that powered countless Allis Chalmers tractors through decades of farm work. Whether you’re restoring a vintage AC or keeping an old workhorse running, these engines were known for their durability when properly maintained with quality parts like these bearings.

Made to Last

Farm engines work hard—long hours at varying RPMs, temperature swings from cold morning starts to hot afternoon fieldwork, and the constant vibration that comes with tractor duty. These replacement bearings use the same materials and tolerances as the originals, with proper oil clearances that ensure adequate lubrication without excessive wear.

Installation Notes

Camshaft bearing replacement requires removing the engine from the tractor and disassembling the block—it’s a job for someone comfortable with engine rebuilds. Check your engine displacement before ordering, as the bearing count varies by engine size. While you’re in there, it’s smart to check the camshaft itself for wear and consider replacing the oil pump if it’s showing its age.