107-8618 (1078618) Caterpillar Coolant / Intake Air Temperature Sensor, compatible with mainstream Caterpillar electronically controlled engines, D-Series excavators, and other equipment. I. Core Basic Information

Part Number: 107-8618 (1078618)

Type: NTC Thermistor Temperature Sensor (Universal for Water/Intake Air Temperature)

Brand: Caterpillar

Function: Monitors engine coolant or intake air temperature; outputs an analog signal to the ECU for thermal management, fuel injection control, and overheat protection.

II. Key Technical Specifications

Electrical: 2-pin waterproof connector; compatible with 12V/24V systems.

Thread: M12×1.5 (Standard)

Measurement Range: -40°C to 150°C

Material: Brass body + high-temperature-resistant sealing; designed to withstand the harsh operating conditions of heavy machinery.

III. Compatible Engine Series

3126, 3176B, 3176C, 3196

3406E, 3408E, 3412E, 3456

C-10, C-12, and other electronically controlled engines.

IV. Main Compatible Equipment

Excavators (Most Common)

320D, 321C, 329D, 330D, 336D, 345B, 345D, 349D, 365B, 385B, 390D

Other Equipment

Wheel Loaders: 950H, 966H, 972H, 980H, 988H

Dozers: D7R, D8T, D9T, D10T

Articulated Trucks: D350E II, D400E II

Motor Graders: 140H, 16M

Cold Planers: PM-200

V. Alternative Models

107-8619 (Same series; identical specifications)

131-0427, 195-2150, 522-1642 (Common OEM alternative part numbers)

VII. Common Faults and Replacement Guidelines **Symptoms**

Abnormal coolant temperature / intake air temperature readings; false illumination of warning lights

Difficulty with cold starts; unstable idling; increased fuel consumption

ECU reports temperature sensor-related fault codes (e.g., P0115, P0116, P0117, P0118)

**Key Replacement Points**

Perform removal and installation only after the engine has cooled down to prevent burns and coolant leakage

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

Tighten to the specified torque (approximately 20–25 N·m)

Conduct a test drive after installation to verify that the temperature display functions normally