A-VTK4039T-AI Valve Train Kit (Std)One New Aftermarket Replacement Valve Train Kit Fits John Deere 4039T (4. 239T) Diesel Engines This aftermarket valve train kit is designed for the Fits John Deere 4039T (4. 239T) turbocharged 4 cylinder diesel engine, also known as the 300 Series Liter Designated engine. The kit services the cylinder head valve assembly and is sold in standard (STD) size. A typical valve train kit for this engine includes intake valves, exhaust valves, valve springs,