Description
When your International Harvester engine starts knocking or you’ve discovered excessive bearing play during an overhaul, these .010 undersized main bearings get you back to reliable operation. These are precision-manufactured bearings designed specifically for International Harvester’s 123 CID four-cylinder engines that have had their crankshafts turned down. Whether you’re rebuilding a utility tractor for daily farm work or restoring a classic Farmall, proper bearing clearances are critical for long engine life.
What You’re Getting
- Complete main bearing set manufactured to OEM specifications by TISCO
- Precision .010 inch undersize for turned crankshafts
- Durable tri-metal construction that handles the loads and heat cycles of farm work
- Proper oil clearances for reliable lubrication throughout the RPM range
Built for Real Farm Work
This bearing set is designed for International Harvester’s 123 CID engines found in the 100 series, 200 Series, Super A-1 Series, Super AV-1 Series, and Super C Series tractors. These tractors were workhorses on farms across America, handling everything from cultivating to loader work to belt-driven equipment.
Made to Last
Farm engines run hard and long, often under dusty conditions with varying loads. These TISCO main bearings are built with the materials and precision needed to handle those demands. The tri-metal construction provides the durability needed for constant operation while maintaining proper oil film strength for reliable lubrication.
Installation Notes
These are .010 undersized bearings, so make sure your crankshaft has been properly machined to .010 under specifications. Check your plastigauge clearances during assembly—proper bearing clearance is critical for oil pressure and engine longevity. A good rule is to replace rod bearings at the same time if you’re doing a complete rebuild.
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