4TN78 4TN78T Valves Kit. Compatible with Yanmar 4TN78 4TN78T 4TN78T-RJ Engine. Compatible with John Deere JD50 50 Excavator. Package included: STD Engine Valves Kit. 8 Pieces Valve Guides. 4 Pieces Intake Valves. 4 Pieces Exhaust Valves. 4 Pieces Intake Valves Seats. 4 Pieces Exhaust Valves Seats. If you are not sure whether it is suitable for your engine, please provide your engine nameplate or part number, and we will help you confirm. If you have any questions or need other sizes, you can let us know. If there is no external requirement, we will send STD size, thank you.