102-0050 (1020050) Caterpillar (CAT) Engine Water Temperature Sensor—used to monitor coolant temperature and compatible with a wide range of classic Caterpillar engines and heavy machinery. I. Core Basic Information

Part Number: 102-0050 (1020050)

Type: Engine Coolant Temperature Sensor (Water Temperature Sensor)

Brand: Caterpillar

Principle: Negative Temperature Coefficient (NTC) Thermistor; resistance decreases as temperature rises, outputting an analog voltage signal to the ECU.

Function: Monitors water temperature; used for engine control, overheat protection, and cold-start fast idle control.

II. Key Specifications and Parameters

Electrical: 2-pin rectangular waterproof connector; analog resistance signal output.

Thread: 3/8"-18 NPT or M14×1.5 (Standard Specifications)

Measurement Range: -40°C to 150°C

Material: Brass body + plastic insulated connector; oil-resistant and heat-resistant.

Compatible Systems: 12V/24V electronic control systems for heavy machinery / generator sets.

III. Main Compatible Models (Engines / Equipment)

Engine Series

3208, 3304, 3304B, 3306, 3306B

3406B, 3406C, 3408, 3408B, 3408C, 3412, 3412C

C15, C18, and other high-power engines.

Heavy Machinery / Equipment

Excavators: E320, 325, 330, 345 series, etc.

Wheel Loaders, Dozers, Motor Graders

Diesel Generator Sets (G3306, G3412, G3508, G3512, G3516)

IV. Alternative / Universal Models

102-3190 (Universal within the same series)

5L-7443, 130-9811, 230-0112 (Interchangeable for select models)

VI. Common Faults and Replacement Guidelines

Fault Symptoms

Inaccurate water temperature gauge readings; warning light illuminates erroneously or fails to illuminate. Symptoms: Difficulty cold-starting, unstable idling, increased fuel consumption

ECU reports a fault code for the coolant temperature sensor

Replacement Guidelines

Depressurize the cooling system; perform removal and installation only after the engine has cooled down

Clean the threads and apply a small amount of sealant or high-temperature grease

Tighten to the specified torque to prevent stripping the threads

After installation, perform a test drive to check for leaks and verify that the coolant temperature display is functioning correctly

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