D1146 71℃ Thermostat 65.06401-6044 300738-00085 For Doosan Engine Parts

Product Details

Product Overview

This premium D1146 71℃ Thermostat, identified by OEM numbers 65.06401-6044 and 300738-00085, is a critical cooling system component designed for Doosan diesel engines. Engineered to open precisely at 71 degrees Celsius, this thermostat ensures optimal engine operating temperature, improving fuel efficiency and reducing wear.

Commonly used in construction, industrial, agricultural, genset, marine, and material handling equipment powered by Doosan D1146 engines, this part is manufactured to OEM size and specifications. It provides a direct replacement solution for maintaining proper engine thermal management in demanding working conditions.

Each unit undergoes rigorous outgoing inspection, and a machinery test report is available upon request, ensuring reliable performance and long service life in heavy-duty applications.

Key Features & Benefits

• Precise Temperature Control: Opens at exactly 71℃ (160°F) to maintain optimal engine operating temperature, reducing cold-start wear and preventing overheating.
• OEM Specification Fit: Manufactured to original Doosan size and design standards, ensuring seamless installation without modifications.
• Durable Construction: Built with high-quality materials to withstand the vibration, heat, and pressure cycles of heavy-duty diesel operation.
• Verified Performance: Each unit includes outgoing video inspection and machinery test report documentation for quality assurance.
• Versatile Application: Suitable for a wide range of equipment types including excavators, loaders, generators, and marine engines using D1146 power units.
• Reliable Supply Chain: Available with OEM service support and online after-warranty technical assistance for global buyers.

Technical Specifications

OEM Cross-Reference

This thermostat directly replaces the following Doosan and compatible OEM part numbers:

• Doosan: 65.06401-6044
• Doosan: 300738-00085
• Alternative Reference: D1146-71℃ Thermostat Assembly

Note: Always verify your engine’s specific part number and housing configuration before ordering.

Compatibility

This thermostat is commonly used for the following applications:

• Engine Model: Doosan D1146 diesel engine
• Equipment Types: Excavators, wheel loaders, bulldozers, forklifts, generators, marine propulsion, agricultural tractors, and industrial power units
• Common Machine Series: Doosan DX series excavators and DL series loaders equipped with D1146 engines

Fitment is inferred based on engine model compatibility. Please confirm your specific machine’s engine configuration.

Global Supply & Distribution

We offer worldwide shipping to major markets including North America, Europe, Asia-Pacific, the Middle East, Africa, and South America. Our logistics network ensures fast delivery to major ports and industrial centers such as Rotterdam, Los Angeles, Shanghai, Dubai, and Singapore.

With years of export experience, we comply with international trade regulations and can provide necessary documentation for customs clearance. Bulk orders and consolidated shipping options are available for volume buyers.

Quality Assurance

• Testing: Each thermostat is tested for opening temperature accuracy and sealing performance before shipment.
• Documentation: Video outgoing inspection and machinery test reports are provided upon request.
• Warranty: 6-month warranty against manufacturing defects.
• Support: Online technical support available after warranty period.
• Certification: Manufactured under quality control standards consistent with ISO requirements for engine components.

FAQ

Q1: How do I verify this thermostat fits my Doosan D1146 engine?
A: Check your original thermostat housing for the stamped part number. The numbers 65.06401-6044 or 300738-00085 should match. Also confirm the thermostat opening temperature requirement—this unit opens at 71°C. If your engine requires a different temperature rating, please contact us for the correct variant.

Q2: What are the signs of a failing thermostat in my excavator?
A: Common symptoms include engine overheating or running too cold, slow warm-up, fluctuating temperature gauge readings, and reduced heater performance in cold weather. A stuck-closed thermostat causes overheating, while a stuck-open thermostat prevents the engine from reaching operating temperature, increasing fuel consumption and wear.

Q3: Can I install this thermostat myself, and what maintenance is recommended?
A: Installation requires basic mechanical skills—drain coolant, remove the thermostat housing, replace the gasket, and install the new thermostat with the correct orientation (spring side toward engine). Always use a new gasket and torque bolts to specification. We recommend replacing the thermostat every 2-3 years or 2,000 operating hours, and always test the new unit in hot water before installation to verify opening temperature.