Description
When your diesel engine starts blowing oil past the rings or losing compression, it’s time to get serious about an engine rebuild. A worn cylinder bore means you’ll need to go oversize, and this 1mm overbore piston ring set gets your 4-390 or 6-590 naturally aspirated diesel engine back to factory specs. Whether you’re rebuilding a four-cylinder or six-cylinder version, this set has everything you need to seal things up tight again.
What You’re Getting
- Complete ring set sized for 1mm overbore cylinders—no guessing on measurements
- Two compression rings at 3/32-inch and one oil control ring at 5/32-inch per cylinder
- Quality construction that handles the heat and pressure of diesel combustion
- Exact specifications for proper ring gap and tension
Built for Real Farm Work
This ring set fits both 4-390 four-cylinder and 6-590 six-cylinder naturally aspirated diesel engines—reliable powerplants found in various agricultural and industrial applications. These engines were built for the long haul, and when you’re doing the work to machine cylinders and rebuild, you want rings that’ll give you another hundred thousand miles of dependable service.
Made to Last
Engine rebuild work isn’t something you want to do twice, so these rings are manufactured to handle the demanding conditions inside a diesel engine. They’re designed to maintain proper sealing through temperature swings, high compression ratios, and the constant expansion and contraction that comes with hard work cycles.
Good to Know
Remember that overbore rings require machine work—your cylinders need to be bored and honed to the proper 1mm oversize dimension before these rings will fit correctly. Check your ring gaps according to engine specifications, and take your time with installation. Clean ring grooves and proper ring orientation are critical for a successful rebuild that’ll last.
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