Thermostat 190° for Cummins ISB PAI# 181866 3954830 4090093 3974371 4929644

Thermostat 190° for Cummins ISB PAI# 181866

This 190°F thermostat for Cummins ISB engines, with PAI# 181866 and cross-reference numbers 3954830, 4090093, 3974371, and 4929644, regulates engine coolant flow for optimal temperature control. It is a reliable replacement part for Cummins ISB diesel engines, commonly used in medium-duty trucks and commercial vehicles.

Overview

This 190°F thermostat for Cummins ISB is engineered to maintain the proper engine temperature, ensuring efficient combustion and reduced emissions. It cross-references to multiple OEM part numbers, including 3954830, 4090093, 3974371, and 4929644, making it a versatile drop-in replacement. This thermostat for Cummins ISB is built for durability and consistent performance in demanding conditions.

Built For Performance

• 190°F opening temperature for consistent heat management
• Cross-references to OEM numbers 3954830, 4090093, 3974371, and 4929644
• High-quality wax pellet actuator for reliable thermal response
• Corrosion-resistant construction for long service life
• Meets or exceeds original equipment specifications

Fits These Machines

• for Cummins ISB 5.9L and 6.7L engines

On-The-Job Use

• Use in commercial truck fleets for routine cooling system maintenance
• Suitable for generator sets powered by Cummins ISB engines
• Common in agricultural and construction equipment applications
• Helps prevent engine overheating during long operational hours

Specs At A Glance

Good To Know

Q: What is the purpose of the cross-reference numbers? A: They allow you to match this thermostat to multiple OEM part numbers, confirming compatibility with your specific Cummins ISB engine. Always verify your original part number against the list before ordering.

Q: Can I install this thermostat myself? A: Yes, if you have moderate mechanical experience. Drain the coolant, remove the housing, replace the thermostat, and refill with fresh coolant. Always torque the housing bolts to the engine manufacturer's specification.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.