WESPC Valve Spring 3174A025 For Perkins 1004 1104 1106 Diesel Engine

WESPC Valve Spring 3174A025 For Perkins 1004 1104 1106 Diesel Engine

Application:

3174A025 is the outer (and often inner) valve spring for 4-, 6- and 8-cylinder Perkins 1004/1104/1106 diesels (4.4–8.8 L) used in JCB 3CX/4CX back-hoe loaders, MF 5400/6400 tractors, 45–250 kVA generator sets, Claas combine harvesters and marine auxiliaries. It controls inlet & exhaust valve motion at speeds up to 3 000 min⁻¹ while meeting EU Stage IIIA / EPA Tier 4-final emission limits.

Technical specifications:

Free length 48 mm, outer diameter 29 mm, wire diameter 3.2 mm, 6 active coils, solid length 28 mm. Material is chrome-vanadium spring steel (50CrV4) oil-quenched and tempered to 47 HRC, then shot-peened to 0.25 mm A-intensity to raise fatigue life to 1 × 10⁷ cycles. Installed load 210 N at 40 mm, solid load 480 N at 28 mm, giving a safety margin of 1.2 against coil bind. Surface is phosphate-coated 3 µm for 96 h salt-spray protection and lightly oiled for corrosion-free storage.

Material & performance features:

The 50CrV4 alloy (0.5 % C, 1 % Cr, 0.15 % V) offers 1 600 MPa tensile strength and 8 % elongation, resisting surge-set when exhaust temperature reaches 700 °C. Controlled shot-peening induces 400 MPa compressive stress on the outer surface, delaying fatigue crack initiation and extending service life to 12 000 h.

Interchange part numbers: 

PERKINS 3174A025, T417515, AGCO 4226319M1, 4227429M1, KMP 3174A025, FPS VS3174A025, ITM VOE3174A025, FAI VS3174A025, AJUSA 8103174A025, GLYCO VS-Per 1004/1104, MAHLE VS-3174A025, AE 3174A025, CLEVITE VS-3174A025, TOPLINE 3174A025, VMC 3174A025, MARINE D’USTRIE 3174A025, KINGSLAND 3174A025, AIC 3174A025, WDPART 3174A025.