Fit for Yanmar 129350-49800 71℃ 160°F Thermostat 3TNA72E-S 3TNA72E-HP 3TNA72E-G2

Thermostat for Yanmar

This thermostat, referenced as for Yanmar 129350-49800, is a 71°C (160°F) cooling system component designed to regulate engine temperature for Yanmar 3TNA72E series engines. It opens at the rated temperature to allow coolant flow, ensuring the engine reaches and maintains optimal operating heat for efficient combustion and reduced wear.

Overview

This thermostat for Yanmar 129350-49800 controls coolant flow by opening at 71°C (160°F), helping the engine warm up quickly and run at a stable temperature. It is built for Yanmar 3TNA72E-S, 3TNA72E-HP, and 3TNA72E-G2 engine models, making it a direct thermal management replacement. This thermostat for Yanmar ensures consistent cooling system performance in demanding work conditions.

Built For Performance

• Rated opening temperature of 71°C (160°F) for precise thermal regulation
• Constructed with corrosion-resistant materials for long service life
• Wax-pellet actuation provides reliable and repeatable opening and closing
• Designed to meet OEM cross-reference 129350-49800 specifications
• Ensures fast engine warm-up and stable operating temperature under load

Fits These Machines

• for Yanmar 3TNA72E-S engine
• for Yanmar 3TNA72E-HP engine
• for Yanmar 3TNA72E-G2 engine

On-The-Job Use

• Replaces a worn or stuck thermostat during routine engine maintenance
• Used in compact construction equipment powered by Yanmar 3TNA72E engines
• Maintains proper coolant flow in generator sets and small industrial machinery
• Supports reliable operation in agricultural and material handling equipment

Specs At A Glance

Good To Know

Q: What does the thermostat do if it fails open? A: A failed-open thermostat prevents the engine from reaching full operating temperature, which can reduce fuel efficiency and increase engine wear over time.

Q: How do I know if this thermostat fits my engine? A: Check your engine model and serial number against the listed Yanmar 3TNA72E variants and the OEM part number 129350-49800 before ordering.

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