Thermostat 129155-49800 for Yanmar 3D84 3TNE84 3TNV84 4D88 4TNV88 4TNE88 Diesel Engine Parts

Product Details

Product Overview

This high-quality thermostat, identified by OEM part number 129155-49800, is a critical cooling system component specifically designed for the Yanmar industrial diesel engine series. It is the direct replacement for the thermostat used in the 3D84, 3TNE84, 3TNV84, 4D88, 4TNV88, and 4TNE88 engine models. Maintaining the correct engine operating temperature is vital for fuel efficiency, emissions control, and long-term engine durability.

While primarily associated with Yanmar machinery, this thermostat is commonly utilized in a wide range of heavy equipment applications where these specific engine blocks are installed. It is a direct OEM-size replacement part, ensuring a proper seal and reliable operation within the engine’s cooling circuit.

Key Features & Benefits

• Precise Temperature Control: Engineered to open and close at the correct temperature range, ensuring the engine reaches optimal operating temperature quickly and maintains it for efficient combustion.
• OEM Standard Fitment: Manufactured to the exact dimensions and specifications of the original Yanmar part (129155-49800), guaranteeing a direct fit with no modifications required.
• Durable Construction: Built from corrosion-resistant materials and a robust wax-pellet element to withstand the high-vibration and high-temperature environment of diesel engines.
• Improved Fuel Economy: By ensuring the engine operates at the correct temperature, this thermostat helps reduce fuel consumption and minimize unnecessary engine wear.
• Reduced Emissions: Proper thermal management is essential for modern diesel engines to meet emission standards, preventing the engine from running too cold or overheating.
• Cost-Effective Solution: Offers a reliable aftermarket alternative to expensive dealer parts without compromising on performance or longevity.

Technical Specifications

OEM Cross-Reference

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

• Yanmar: 129155-49800

Note: This is the specific OEM number for this component. Always verify your existing part number matches the list above to ensure compatibility.

Compatibility

This thermostat is specifically designed for use in the following Yanmar diesel engine models:

• Engine Models: 3D84, 3TNE84, 3TNV84, 4D88, 4TNV88, 4TNE88

These engines are commonly used for powering a variety of industrial and construction machinery, including:

• Excavators
• Forklifts
• Bulldozers
• Loaders
• Agricultural Tractors
• Generator Sets

Global Supply & Distribution

We specialize in the global distribution of high-quality diesel engine parts. Our logistics network ensures fast and reliable shipping to industrial centers worldwide, including major ports in North America (Los Angeles, Houston, New York), Europe (Rotterdam, Hamburg, Antwerp), Asia-Pacific (Shanghai, Singapore, Tokyo), and the Middle East (Dubai, Jebel Ali).

We have extensive experience in international trade and can handle a variety of shipping requirements, including air freight, sea freight, and express courier services. Our stock is readily available to support both wholesale orders and urgent replacement needs for maintenance teams and parts suppliers.

Quality Assurance

• Manufacturing Standards: Produced in ISO-compliant facilities in Guangdong and Guizhou, China, with strict quality control procedures.
• Testing: Each batch undergoes a machinery test report to verify opening temperature and flow characteristics. A video outgoing inspection is available upon request to confirm part condition before shipping.
• Warranty: This product is backed by a 6-month warranty against manufacturing defects in materials and workmanship.

FAQ

Q1: How do I know if this thermostat (129155-49800) fits my engine?
A: This thermostat is specifically designed for the Yanmar 3D84, 3TNE84, 3TNV84, 4D88, 4TNV88, and 4TNE88 engine models. Please check the identification plate on your engine block to confirm the model number. If your engine is one of these models, this part will be a direct mechanical fit.

Q2: What happens if my engine’s thermostat is stuck open or closed?
A: A thermostat stuck open will cause the engine to run too cold, leading to poor fuel economy, increased engine wear, and low heater output. A thermostat stuck closed will prevent coolant from flowing to the radiator, causing rapid overheating and potential engine damage. Replacing a faulty thermostat immediately is critical for engine health.

Q3: Is there any special installation procedure for this thermostat?
A: Installation is straightforward for a qualified mechanic. Always ensure the thermostat is installed in the correct orientation (usually with the air bleed valve or jiggle pin at the highest point). We recommend replacing the thermostat housing gasket or O-ring at the same time to prevent leaks. After installation, run the engine to operating temperature and check for leaks and proper cooling fan engagement.