WESPC Valve Seat 3314A102 For Perkins 1004-42 N4.421 1004.40 Diesel Engine

WESPC Valve Seat 3314A102 For Perkins 1004-42 N4.421 1004.40 Diesel Engine

Application:

Valve seat 3314A102 is the exhaust seat specified for the four-cylinder Perkins 1004-42, N4.421 and 1004.40 naturally-aspirated and turbocharged diesels (4.0 L) that power Massey Ferguson 362/365/375/383 agricultural tractors, MF 30 and 31 combine harvesters, JCB H155XL forklifts, 40-65 kVA generator sets and a wide range of sweepers, forklift trucks and irrigation pumps. The same seat is also used in the 1004.4T and AT4.40 turbo builds, making it a common service component across farms, rental fleets and construction yards worldwide.

Technical specifications:

The seat is a press-in ring 44.1 mm (1.737 in) outside diameter, 37.3 mm inside diameter and 9.5 mm overall height, machined with a 45° conical face that mates with the exhaust valve head. The outside diameter is precision-ground to a 0.04 mm interference fit to guarantee positive retention in the cast-iron cylinder head, while the 2.4 mm wide seat contact band seals reliably at boost pressures up to 1.4 bar and exhaust gas temperatures of 720 °C.

Material & performance features:

The seat is manufactured from a low-carbon Cr-Mo-V sintered steel (Fe-2Cr-1.5Mo-0.8C) that is oil-quenched after sintering to reach a core hardness of 90 HRB, then double-tempered to relieve internal stress. The working face is high-frequency induction-hardened to 50 HRC to a depth of 1.1 mm, giving a wear index better than 900 hours in continuous 3000 rpm field tests. A manganese phosphate conversion coating (2–3 µm) is applied to the outer diameter to improve initial lubrication during press-fit and prevent micro-welding under severe thermal cycling.

Interchange part numbers: 

PERKINS 3314A102, 3314A101, 3314A103, 3314A104; MASSEY FERGUSON 4224008M1, 1763138; JCB 331/43029, 331/43030; LEYLAND 5L4342; KMP 3314A102-4; ITM 1158147.