4TNV94 71°C Thermostat 121850-49810 for Yanmar Diesel Engine Parts Excavator

Product Details

Product Overview

This premium replacement thermostat, specifically designed for the Yanmar 4TNV94 diesel engine, is a critical component for maintaining optimal engine operating temperature. Identified by the OEM part number 121850-49810, this thermostat opens at precisely 71°C (160°F), ensuring the engine reaches its ideal running temperature quickly and stays within the correct thermal range during operation.

Manufactured to OEM size and specifications, this thermostat is a direct-fit replacement for a wide range of heavy equipment and industrial machinery. It is commonly used in excavators, forklifts, bulldozers, loaders, trucks, and buses powered by the Yanmar 4TNV94 series engine. By regulating coolant flow, it prevents overheating, reduces engine wear, and improves fuel efficiency, making it an essential part for any engine overhaul or cooling system maintenance.

Key Features & Benefits

• Precise Temperature Control: Engineered to open at 71°C, this thermostat ensures your 4TNV94 engine operates at the ideal temperature for peak performance and reduced emissions.
• OEM Specification Fit: Built to the exact size and tolerances of the original Yanmar part (121850-49810), guaranteeing a perfect seal and reliable operation without modification.
• Enhanced Engine Protection: Prevents thermal shock and reduces cold-start wear by regulating warm-up time, extending the lifespan of your diesel engine.
• Durable Construction: Manufactured from high-grade materials to withstand the harsh conditions of heavy-duty applications, including vibration, pressure, and coolant corrosion.
• Cost-Effective Maintenance: A direct replacement for a failing thermostat, this part helps avoid costly repairs associated with engine overheating or running too cold.
• Versatile Application: Suitable for a wide range of equipment including excavators, forklifts, bulldozers, and loaders, making it a versatile stock item for workshops.

Technical Specifications

OEM Cross-Reference

This thermostat is a direct replacement for the following OEM and reference numbers:

• OEM Yanmar: 121850-49810
• Alternate Number: 121850-49811 (Check for compatibility)

Compatibility

This part is specifically designed for the Yanmar 4TNV94 diesel engine. It is commonly used for maintenance and repair in the following equipment types utilizing this engine platform:

• Construction Equipment: Excavators, Bulldozers, Loaders
• Material Handling: Forklifts
• Commercial Vehicles: Trucks, Buses
• Agricultural Machinery: Various tractors and harvesters

Note: Please verify your specific engine model (4TNV94) before ordering. This part is for the 71°C variant.

Global Supply & Distribution

Our facility in Guangdong, China, serves as a central hub for global distribution. We offer worldwide shipping via sea, air, and express courier services to meet urgent demands and planned maintenance schedules.

Major Markets Served:

• North America: Fast delivery to major industrial centers in the USA, Canada, and Mexico.
• Europe: Efficient logistics to ports like Rotterdam, Hamburg, and inland hubs.
• Asia-Pacific: Quick transit times to Japan, Korea, Australia, and Southeast Asian markets.
• Middle East & Africa: Reliable shipping to Dubai, Jebel Ali, and major African ports.
• South America: Regular shipments to Brazil, Chile, and Argentina.

We have extensive experience in international trade, handling customs documentation and ensuring compliance with global shipping standards to provide a seamless procurement experience for B2B buyers worldwide.

Quality Assurance

We are committed to providing high-quality replacement parts that meet strict performance standards.

• Manufacturing Standards: Products are manufactured in ISO-certified facilities, ensuring consistent quality and dimensional accuracy.
• Testing: Each part undergoes a Machinery Test Report. We also provide a Video Outgoing Inspection service to verify the product before shipment, giving you full confidence in your order.
• Warranty: This thermostat is backed by a 6-month warranty against manufacturing defects in materials and workmanship.

FAQ

Q1: How do I know if this thermostat will fit my Yanmar 4TNV94 engine?

A: This thermostat is specifically designed for the Yanmar 4TNV94 engine and matches the OEM part number 121850-49810. Please check your engine’s model plate to confirm it is a 4TNV94. Also, verify your required opening temperature; this unit opens at 71°C. If your engine requires a different temperature (e.g., 82°C), this part will not be suitable.

Q2: What are the signs that my current 4TNV94 thermostat is failing?

A: Common symptoms include the engine overheating, taking a very long time to reach operating temperature (running cold), or fluctuating temperature gauge readings. You may also notice coolant leaks around the thermostat housing. If you experience any of these issues, replacing the thermostat is a standard and effective first step in cooling system diagnosis.

Q3: Is this a complete replacement kit, or just the thermostat unit?

A: This product listing is for the thermostat unit itself. For a complete installation, we recommend also purchasing a new gasket or O-ring for the thermostat housing to ensure a proper seal and prevent leaks. Please check your equipment’s service manual for the correct gasket part number.