This 3174A028 outer valve spring is engineered for 4-cylinder Perkins 1104D-E44T, 1104D-E44TA, 1104C-44T and 1206E-E66TA diesel engines (4.4-6.6 L capacity). Compatible equipment includes JCB 3CX/4CX back-hoe loaders, Case Maxxum tractors, 45-70 kVA "Vista A" generator sets, and MF 5400-series farm tractors. Maintains precise valve motion up to 3,000 min⁻¹ while meeting stringent EU Stage IIIA / EPA Tier 4-final emission standards.

• Constructed from chrome-vanadium spring steel (50CrV4) with oil-quenching and tempering to 47 HRC hardness
• Shot-peened to 0.25 mm A-intensity for enhanced fatigue life of 1 × 10⁷ cycles
• 50CrV4 alloy composition (0.5% C, 1% Cr, 0.15% V) provides 1,600 MPa tensile strength and 8% elongation
• Resists surge-set at exhaust temperatures up to 700°C
• Controlled shot-peening induces 400 MPa compressive stress, delaying fatigue crack initiation
• Extended service life of 12,000 hours under normal operating conditions
• Phosphate coating retains oil during cold starts, reducing initial scuffing by 20%
• Closed-and-ground ends maintain squareness within 0.5°, preventing valve head tilt and seal wear

PERKINS 3174A028, T417713, AGCO 4224856M1, 4224856V1, KMP 3174A028, FPS VS3174A028, ITM VOE3174A028, FAI VS3174A028, AJUSA 8103174A028, GLYCO VS-Per 1104, MAHLE VS-3174A028, AE 3174A028, CLEVITE VS-3174A028, TOPLINE 3174A028, VMC 3174A028, MARINE D'USTRIE 3174A028, KINGSLAND 3174A028, AIC 3174A028, WDPART 3174A028