WESPC Intake Valve Seat T407000 for Perkins 4.236 4.248 6.354.2 A4.236 T4.236

Application:

The T407000 Intake Valve Seat is designed for Perkins 4.236, 4.248, 6.354.2, A4.236, T4.236, 6.354, 6.354.1, 6.354.4, AT6.354, and G4.236 naturally aspirated and turbo-charged diesel engines. These engines are commonly used in Massey Ferguson 165-398 series tractors, MF 30-50 backhoe loaders, MF 550-890 combines, Landini 7860-8880 row-crop tractors, Claas 65-75 forage harvesters, JCB 3CX/4CX backhoes, New Holland 1116 swathers, 1495/1496 mower-conditioners, FG-Wilson P100-4 and P135-4 generator sets, and various irrigation, construction, and marine auxiliary equipment.

Technical specifications:

The T407000 Intake Valve Seat features a precision-machined design with a bore diameter of 36.6 mm, seat angle of 45°, overall length of 123.3 mm, and stem diameter of 9.5 mm. The valve seat is manufactured from high-quality alloy cast iron, ensuring excellent wear resistance and high-temperature performance. It undergoes advanced gas nitriding treatment to enhance surface hardness and durability. The induction-hardened stem tip (52-58 HRC) and gas-nitrided layer (0.03-0.05 mm thick) provide superior scuff resistance, crucial for the high-temperature exhaust pulses typical of turbocharged Perkins engines. The head and stem are CNC-finished to Ra 0.2 µm, guaranteeing positive sealing and uniform heat transfer every cycle.

Material & performance features:

The T407000 Intake Valve Seat is forged from 21-4N (5Cr21Mn9Ni4N) austenitic steel, which retains 900 MPa tensile strength at 700 °C. The head is flash-chrome plated (≈3 µm) to reduce friction and valve-guide wear. The nitride layer on the stem prevents micro-welding, ensuring stable lash over thousands of hours of stop-start field service. The tulip profile is swirl-polished to improve flow efficiency and reduce pumping losses, contributing to cleaner combustion and lower fuel consumption across the 4.236/6.354 engine map.

Interchange part numbers:

PERKINS 31431881, 31431882, 31431883, 31431884; MASSEY FERGUSON 741466M1, 747552M1, 739027M1; LANDINI 31431881; JCB 333/E0002; KMP 31431881; AE 20946; Mahle 043VE30835000; Bepco BV31431881; SBI 01785