Description

When you’re noticing blow-by smoke, oil consumption that just keeps getting worse, or your diesel engine isn’t pulling like it used to, worn piston rings are often the culprit. This ring set gets your engine back to sealing properly, restoring that crisp compression and clean operation you need for a full day’s work. This oversized set is built for rebuilding engines with cylinders bored 1mm over standard size.

What You’re Getting

Complete ring set including one keystone compression ring, one standard compression ring, and one oil control ring
Precisely sized for 1mm overbore cylinders—no guessing about fitment
Quality construction designed to handle the high compression and heat of turbocharged engines
Direct replacement that restores proper sealing and reduces oil consumption

Built for Heavy-Duty Engine Work

This ring set fits both 4T-390 and 6T-590 turbocharged diesel engines, whether naturally aspirated turbo or intercooled aftercooled versions. These powerplants are found in serious work tractors that handle everything from heavy tillage to loader work to continuous PTO operations where reliable compression is critical for maintaining power.

Made to Last

These rings are manufactured to maintain proper tension and sealing through thousands of operating hours. The mix of ring types—keystone, standard compression, and oil control—provides the right combination of sealing and oil management that turbocharged engines demand.

Installation Notes

Ring installation requires proper bore preparation and careful gap checking. When you’re doing an overhaul, take time to properly deglaze the cylinder walls and check your ring end gaps before assembly. The keystone ring goes on top, followed by the compression ring, with the oil control ring at the bottom.