76℃ 168.8℉ Thermostat 5337966 w/ O-Ring Seal for 98.5-02 Cummins 5.9 24V ISB

Thermostat 5337966 for Cummins

This thermostat with 76℃ (168.8℉) opening temperature and integrated O-ring seal replaces OEM part 5337966, providing reliable engine cooling regulation for 1998.5-2002 Cummins 5.9L 24V ISB engines.

Overview

This 76℃ 168.8℉ thermostat is a direct-fit cooling component designed for the 98.5-02 Cummins 5.9 24V ISB engine. It controls engine operating temperature by opening at 168.8℉ to allow coolant flow, ensuring proper warm-up and preventing overheating. The included O-ring seal ensures a leak-free installation without the need for a separate gasket.

Built For Performance

• Opening temperature calibrated at 76℃ (168.8℉) for correct engine warm-up
• Includes integrated O-ring seal for a secure, leak-resistant fit
• Replaces OEM part number 5337966
• Constructed with corrosion-resistant materials for long service life
• Precision-engineered valve ensures consistent coolant flow control

Fits These Machines

• for Cummins 5.9L 24V ISB engine (1998.5-2002 model years)

On-The-Job Use

• Replaces a worn or stuck thermostat during routine cooling system maintenance
• Restores proper warm-up time and heater performance in cold climates
• Prevents engine overheating during heavy loads or towing

Specs At A Glance

Good To Know

Q: Does this thermostat come with the gasket needed for installation? A: Yes, the O-ring seal is included, so you do not need to purchase a separate gasket for this thermostat.

Q: Will this thermostat work on a 2001 Cummins 5.9 ISB? A: Yes, it is designed for the 1998.5-2002 Cummins 5.9 24V ISB engine, which covers your 2001 model.

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