385720500 Water Temperature Sensor for Perkins 403D 404D 403C 404C FG Wilson

Product Overview

This water temperature sensor monitors engine coolant temperature to ensure optimal performance and prevent overheating in Perkins and FG Wilson industrial diesel engines. Designed as a direct OE replacement, it provides accurate readings for engine control units and dashboard gauges. Reliable temperature sensing is critical for maintaining efficiency in generator sets, agricultural equipment, and construction machinery.

Key Features & Performance

• Direct replacement for OEM part number 385720500 with identical thread and electrical specifications
• Precision thermistor element delivers rapid and accurate coolant temperature response
• Corrosion-resistant brass or stainless steel housing for long service life in harsh environments
• Compact threaded design for easy installation into standard engine water jacket ports
• Compatible with standard 2-pin or spade connector configurations (verify original wiring)

Fitment & Compatibility

• Perkins 403D-11G, 403D-15G, 403D-15T
• Perkins 404D-22G, 404D-22TA
• Perkins 403C-15, 403C-15G
• Perkins 404C-22, 404C-22G
• FG Wilson generator sets using Perkins 400 series engines

Common Uses

• Monitoring coolant temperature in Perkins-powered generator sets
• Temperature sensing for industrial pumps and compressors
• Replacement in agricultural tractors and loaders with Perkins 400 series engines
• Maintenance repair for construction equipment like skid steers and backhoes

Technical Specifications

• Part Number(s): 385720500
• Sensor Type: Negative Temperature Coefficient (NTC) thermistor
• Thread Size: 1/8" NPT or M14 x 1.5 (verify original)
• Operating Temperature Range: -40°C to +135°C
• Connector Type: 2-pin female spade

Frequently Asked Questions

Q: Will this sensor fit my Perkins 404D-22 generator? A: Yes, this 385720500 sensor is a direct fit for Perkins 404D-22G and 404D-22TA engines and most FG Wilson generators using that engine family.

Q: What is the resistance reading at operating temperature? A: Typical resistance at 100°C is approximately 150-200 ohms; verify with your engine manual for exact calibration.

Product appearance and specifications may vary slightly by batch. Compatibility may vary by serial number. Verify fitment before purchase.