Description

When your diesel engine starts running rough or losing power, worn intake valves are often the hidden culprit. These hardworking components open and close thousands of times per minute, controlling the air flow that makes combustion possible. Over time, valve faces wear, stems get carbon buildup, and sealing surfaces deteriorate—problems that rob your engine of power and fuel efficiency. This TISCO replacement intake valve gets your engine breathing properly again.

What You’re Getting

Standard specification intake valve built to OEM dimensions and tolerances
Heat-treated valve face and stem for long service life under extreme conditions
Precision-ground sealing surfaces that mate properly with valve seats
Quality construction that handles the demands of agricultural diesel operation

Built for Real Farm Work

This intake valve fits John Deere’s 404 CID 6-cylinder turbocharged diesel engines (serial number 335846 and up) and 466 CID 6-cylinder diesel engines (both turbocharged and naturally aspirated versions). These are the powerplants you’ll find in larger John Deere tractors handling serious field work—from heavy tillage and planting to harvest operations where reliability matters most.

Made to Last

Intake valves face some of the harshest conditions in your engine, constantly opening against combustion pressures while dealing with heat, corrosion, and carbon deposits. This TISCO valve is manufactured from quality materials with proper heat treatment to resist wear and maintain sealing integrity season after season. The precision machining ensures proper fit with your valve guides and seats.

Good to Know

Valve replacement is precision work best left to experienced mechanics with proper tools. When replacing intake valves, it’s smart to check valve guides, seats, and springs at the same time. If you’re doing a complete valve job, consider replacing all intake valves together rather than mixing old and new. Always follow proper torque specifications and valve adjustment procedures for your specific engine.