Description

When your John Deere diesel engine starts making that telltale knocking sound or you’re dealing with low oil pressure, it’s often the main bearings telling you they’ve had enough. This .020 oversize main bearing set gets your engine back to running smooth and quiet, giving you the reliability you need when there’s work to be done. It’s designed for engines that have been turned .020 over during rebuild, which is pretty common when these older workhorses get refreshed.

What You’re Getting

Complete 5-bearing set with off-center locating tabs on both halves for proper positioning
.020 inch oversize to match your machined crankshaft journals
Quality construction that meets the demands of hard-working diesel engines
Precise fit for both 254 CID and 270 CID four-cylinder John Deere diesels
Direct replacement that eliminates guesswork during engine rebuild

Built for Real Farm Work

This bearing set works in John Deere’s 254 cubic inch and 270 cubic inch four-cylinder diesel engines found in many of their utility and row crop tractors from the ’70s and ’80s. These engines powered everything from hay operations to row crop work, and when properly maintained, they’re known for running hundreds of thousands of hours. The specific block numbers this fits include R26160 for the 254 CID and R32020 and R40850 for the 270 CID up to serial number 280000.

Made to Last

Main bearings take tremendous loads and heat cycles, especially in diesel engines that see heavy use. These bearings are manufactured to handle the constant pounding and high pressures that come with diesel combustion and hydraulic loading. The off-center locating tabs ensure they stay positioned properly during assembly and operation, preventing the kind of bearing movement that leads to premature failure.

Installation Notes

This is a job for someone comfortable with engine work, as it requires removing the oil pan and crankshaft. Make sure your crankshaft has actually been turned .020 over—standard bearings won’t work on machined journals. Clean everything thoroughly during assembly and use proper torque specs for the main caps. A good tip is to check bearing clearances with plastigage before final assembly to ensure everything’s within spec.