WESPC 4133L503 4133L509 Thermostat for Perkins 1103 1104 Diesel Engines Parts

Application:

WESPC 4133L509 and 4133L503 thermostat assemblies are designed for Perkins 1100 series 3- and 4-cylinder diesel engines, including models 1103C-33T, 1104C-44, and 1104C-44T. These assemblies regulate coolant flow based on engine temperature, ensuring rapid warm-up and maintaining thermal stability during continuous operation. Both part numbers are verified replacements for Perkins engines used across generator sets, construction machinery, agricultural equipment, and industrial systems. The thermostats begin to open at 82°C (180°F), supporting efficient heat dissipation and protecting the engine from overheating. The assemblies include the thermostat, connection housing, and sealing components, with 4133L509 typically used in right-hand configurations and 4133L503 in vertical or alternate mounting setups.

Generator sets:

Commonly installed in 50–150 kVA diesel generator platforms powered by Perkins 1103 and 1104 series engines. WESPC 4133L509 and 4133L503 thermostat assemblies ensure consistent coolant circulation, contributing to fuel efficiency and reduced wear. They support stable combustion and long-term reliability in commercial backup systems, telecom power modules, and mobile gensets operating under variable load conditions.

Construction machinery:

Suitable for JCB, Terex, and Volvo CE equipment powered by Perkins 1100 series engines. The thermostat assemblies maintain optimal engine temperature in high-vibration environments, supporting torque output and mechanical integrity. Verified applications include JCB 3CX, Terex TLB840, and Volvo BL60 loaders, where thermal control is essential to uptime and engine longevity.

Agricultural equipment:

Applied in Massey Ferguson and Landini tractors requiring long service intervals and stable engine operation. WESPC 4133L509 and 4133L503 thermostat assemblies support rapid warm-up and consistent temperature regulation during extended field operations, reducing fuel consumption and protecting internal components from thermal cycling. They ensure reliable performance in MF 440, MF 470, and Landini Powerfarm series tractors equipped with Perkins 1104C engines.

Industrial systems:

Installed in stationary pumps, compressors, and hydraulic power units using Perkins 1100 series engines. The thermostat assemblies support continuous operation by regulating coolant flow and maintaining lubrication integrity. Their robust design ensures performance in demanding industrial environments with frequent start-stop cycles and elevated ambient temperatures.

Technical specifications:
Part numbers: 4133L509 (right-hand), 4133L503 (vertical)
Compatible engines: Perkins 1103C-33T, 1104C-44, 1104C-44T
Opening temperature: 82°C (180°F)
Material: corrosion-resistant brass and stainless steel
Assembly includes: thermostat, connection housing, sealing components
Dimensions: approx. 110 mm × 85 mm × 65 mm
Weight: approx. 0.9 kg
Packaging: neutral carton box, 20 pcs/carton
Warranty: 12 months manufacturer warranty

Material & performance features:

Manufactured using high-grade brass and stainless steel for corrosion resistance and thermal stability. The wax element is engineered for precise temperature response, ensuring reliable coolant flow control under varying operating conditions. The housing and sealing components are designed to withstand thermal expansion and mechanical stress, supporting long-term durability. Produced under ISO-certified quality control standards to ensure consistent performance across all applications.

Interchange part numbers:

4133L509, 4133L503; verified fitment for Perkins 1103 and 1104 series engines. Compatible with standard maintenance and rebuild procedures across generator, construction, agricultural, and industrial applications.