WESPC 2641A312 Diesel Fuel Injection Pump for Perkins 1103C-33T Engine with 1450 bar Pressure and 125 L/h Flow Rate

WESPC 2641A312 diesel fuel injection pump engineered specifically for Perkins 1103C-33T and 1104C-44T mechanical-injection turbo-diesel engines. This precision component delivers reliable performance for agricultural, construction, and power generation applications.

This rotary distributor pump is designed for Perkins 1103C-33T and 1104C-44T mechanical-injection turbo-diesel engines (3.3L and 4.4L displacement) powering:

• Massey Ferguson 3400-series and 5400-series tractors
• Landini Rex 4-100/110 and Powerfarm 105/115 models
• JCB 3CX backhoe loaders and 530-70 Loadall telescopic handlers
• FG Wilson P18-6 and Pramac GSW65P enclosed generator sets

These engines deliver 60-85 kW at 2,200 r/min while meeting EU Stage II and EPA Tier 2 emission standards. The pump ensures precise fuel metering for high-torque performance, smoke-free acceleration, and reliable cold-start operation.

• Pump Construction: Single-piece close-grain cast-iron monobloc with integral cam ring and distributor head
• Mounting: SAE J744 size 2, center-line flange with Ø101.6 mm pilot and four M10 threaded holes on 146 mm PCD
• Plunger: 10 mm diameter with 9.5 mm stroke
• Injection Pressure: Up to 1,450 bar
• Feed Pump: Internal positive-displacement vane type delivering 125 L/h at 400 kPa
• Advance Mechanism: Hydraulic automatic advance providing 7° crank-angle advance from 1,000 to 2,400 r/min
• Drive Hub: 12 mm Woodruff key with ISO 1940 Grade G2.5 dynamic balance
• Static Timing: 11° BTDC ±1° with ±3° fine adjustment via eccentric cam ring
• Seal Material: FKM (Viton) compound compatible with biodiesel blends up to B20 and arctic-grade diesel down to -40°C

• Plunger & Rotor: Vacuum-remelted 18CrNiMo7-6 alloy steel, carburised to 0.9 mm case depth with 0.15 µm Ra super-finish
• Cam-Ring: Induction-hardened to 60-64 HRC
• Roller Tappets: Diamond-like carbon (DLC) coating reducing boundary friction by 30%
• Governor: Lightweight aluminium sleeve with PTFE-impregnated bore maintaining idle stability within 2% of set speed
• Pressure Galleries: Laser-welded high-pressure steel construction
• Fuel-Stop Solenoid: IP67-rated glass-fiber-reinforced polyamide housing
• Vibration Control: Integral viscous torsional damper limiting peak twist to

PERKINS: 2641A312, 2641A313, 2641A314

MASSEY FERGUSON: 3638729M91, 3638730M91

LANDINI: 747610M91, 747611M91

JCB: 331/20301, 331/20302

FG WILSON: 10000-45218

PRAMAC: 6000-45218

Reference equivalents: 1-12320-740-0 and 04279-0L090 assemblies