Description
Overview:
This genuine Yanmar thermostat (71°C opening temperature) is designed to control coolant flow precisely in compact diesel engines. Built for reliable service, it features a durable metal alloy body with a stainless-steel spring and a wax-element actuator for consistent temperature response. It helps the engine warm up quickly and then holds it in the optimal operating range, preventing overheating and overcooling. The unit is a direct-fit replacement for Yanmar 3TNA72 and 3TNE74 engines used across construction and garden machinery such as mini excavators, compact loaders, generators, pumps, and professional mowers. Its compact cartridge form with a circular flange measures approximately 4.5 cm by 4.5 cm, making installation straightforward during routine cooling system maintenance or repairs. Genuine Yanmar OEM quality supports long service life and dependable performance.
Key Features:
- Genuine Yanmar OEM part for assured compatibility and build quality
- 71°C thermostat for stable operating temperature and efficient running
- Robust metal alloy body with corrosion-resistant components for durability
- Stainless-steel spring and wax-element actuator for accurate temperature control
- Helps prevent overheating, overcooling, and temperature fluctuation under load
- Supports quicker warm-up to reduce wear during cold starts
- Compact cartridge design for easy drop-in replacement
- Overall footprint approximately 4.5 cm x 4.5 cm for a neat fit in the housing
- Suited to construction and garden machinery using specified Yanmar engines
- Reliable sealing surfaces to maintain coolant system integrity and reduce leaks
Typical Applications:
Used when replacing a faulty thermostat causing slow warm-up, overheating, or unstable temperature. Common during engine rebuilds, coolant flushes, or scheduled maintenance on equipment powered by Yanmar 3-cylinder diesels, including mini excavators, compact loaders, turf machinery, tractors, generators, and pumps.
Also known as:
Coolant temperature regulator, thermostatic valve, wax pellet thermostat, engine temperature valve, coolant control valve, cooling system thermostat, engine coolant regulator.
Fits Models:
3TNA72, 3TNA72L, 3TNE74, 3TNV74
Alternate Part Numbers:
129350-49800, 12935049800
Product Specifications
| L&S Part No. | 129350 49800 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Yanmar |
| OEM No. | 129350-49800 |
| Unit of Sale | 1 |
| Machine Type | Engines |
| Fits Brands | Yanmar |
| Key Features | - Genuine Yanmar OEM part ensures compatibility with specified engines - 71°C opening temperature for stable engine operation - Fits Yanmar 3TNA72 and 3TNE74 engines - Compact 4.5 cm x 4.5 cm cartridge design - Stainless-steel spring for accurate temperature control |
| Fits Models | 3TNA72L |
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