129350-49800 71℃ 160°F Thermostat for Yanmar 3TNA72E-YL 3TNA72E-UNS 3TNA72E-UAS

Thermostat 129350-49800 for Yanmar

This thermostat with part number 129350-49800 is a 71°C (160°F) cooling system component designed for Yanmar diesel engines, specifically the 3TNA72E-YL, 3TNA72E-UNS, and 3TNA72E-UAS models. It regulates engine temperature by opening at its rated heat level to permit coolant circulation. This replacement part ensures your Yanmar engine maintains its ideal operating temperature.

Overview

This 71°C thermostat for Yanmar engines is a direct replacement part designed to control coolant flow. It opens at 160°F to keep the engine from overheating or running too cold, promoting efficient combustion. This thermostat is built for Yanmar 3TNA72E series engines, commonly found in compact tractors and industrial equipment.

Built For Performance

• Rated to open at exactly 71°C (160°F) for accurate temperature control
• Precision-machined valve and seat for leak-free sealing
• Durable construction resists corrosion from engine coolant
• Tested for reliable operation under high-pressure cooling systems
• Direct replacement for Yanmar OEM part number 129350-49800

Fits These Machines

• for Yanmar 3TNA72E-YL engine
• for Yanmar 3TNA72E-UNS engine
• for Yanmar 3TNA72E-UAS engine

On-The-Job Use

• Used in Yanmar-powered compact tractors for loader and mowing tasks
• Helps maintain consistent engine heat during tillage and hauling work
• Suitable for generator sets and pumps driven by Yanmar 3TNA72E engines
• Ensures fast warm-up on cold mornings for immediate power delivery

Specs At A Glance

Good To Know

Q: Is this thermostat specific to the listed engine models? A: Yes, it is designed for the Yanmar 3TNA72E-YL, 3TNA72E-UNS, and 3TNA72E-UAS engine variants, but always double-check your engine serial number before purchase.

Q: How do I know if my thermostat needs replacing? A: If your engine overheats quickly or takes too long to warm up, the thermostat may be stuck or failing; a new unit restores proper coolant flow.

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