Description

When your diesel engine starts blowing oil past the rings or loses compression, you know it’s time for a rebuild—and choosing the right ring set is critical to getting back the power and efficiency you need. This 0.5mm overbore piston ring set gives your 4-cylinder or 6-cylinder naturally-aspirated diesel engine a fresh start with proper compression and oil control.

What You’re Getting

Complete ring set with 2 compression rings at 3/32″ and 1 oil control ring at 5/32″
Precision-manufactured 0.5mm overbore sizing for engines that have been machined oversized
Quality materials designed to handle the heat and pressure cycles of diesel operation
Proper ring configuration that restores compression and controls oil consumption

Built for Real Farm Work

This ring set fits both 4-390 four-cylinder and 6-590 six-cylinder naturally-aspirated diesel engines found in various agricultural equipment. These are the reliable workhorses that power through long days of cultivation, harvesting, and general farm duties where consistent power delivery matters.

Made to Last

Diesel engines work hard, and these rings are built to match that durability. The compression rings seal combustion pressure while the oil control ring keeps oil where it belongs—in the crankcase, not in your exhaust or combustion chamber. Quality materials resist wear and maintain their sealing properties through thousands of hours of operation.

Good to Know

This is for engines that have been bored 0.5mm oversize—make sure your machine work matches before ordering. You’ll need 4 complete sets for the 4-cylinder engine or 6 sets for the 6-cylinder. Take time to properly deglaze the cylinder walls and check ring end gap during installation for the best results.