Product Overview

This is a high-quality replacement thermostat designed for Yanmar 4D84 and 4D88 series diesel engines. Engineered to meet or exceed OEM specifications, this component is essential for maintaining optimal engine operating temperature, ensuring fuel efficiency and preventing overheating damage. We supply this part globally to major markets including North America, Europe, the Middle East, and Asia-Pacific, supporting a wide range of industrial and commercial applications.

Key Features & Benefits

• Precision Engineered: Manufactured to exact OEM dimensions and specifications for a perfect fit and reliable performance.
• Enhanced Durability: Constructed from high-grade materials to withstand the demanding conditions of industrial diesel engines.
• Optimal Temperature Control: Ensures the engine reaches and maintains its ideal operating temperature quickly, improving efficiency and reducing wear.
• Global Compliance: Produced for international markets, ensuring compatibility and reliability across different operating environments.
• Cost-Effective Solution: Provides OEM-level quality and performance at a competitive price, ideal for fleet maintenance and equipment rebuilds.

Technical Specifications

OEM Cross-Reference

This thermostat directly replaces the following OEM part numbers:

• Yanmar: 129155-49801
• Yanmar: 129155-49800

Note: OEM service and alternative part number sourcing are available upon request.

Compatibility

This thermostat is specifically designed for Yanmar 4D84 and 4D88 series diesel engines. These engines are commonly found in a wide array of machinery, including:

• Construction Equipment: Excavators, loaders, compactors.
• Industrial Machinery: Pumps, compressors, power units.
• Agriculture: Tractors, harvesters, irrigation systems.
• Power Generation: Gensets and standby power units.
• Marine: Auxiliary engines and small craft propulsion.
• Material Handling: Forklifts and terminal tractors.

Global Supply & Distribution

We are a professional exporter of heavy-duty engine components with extensive experience in international logistics and trade compliance. Our supply chain is optimized for fast, reliable delivery to key industrial regions worldwide.

• Worldwide Shipping: We ship to all major markets, including North America (USA, Canada, Mexico), Europe (UK, Germany, Netherlands), Asia-Pacific (Australia, Japan, Singapore), and the Middle East (UAE, Saudi Arabia).
• Efficient Logistics: Consolidated shipments to major ports and logistics hubs ensure cost-effective and timely delivery for B2B clients.
• Export Expertise: All documentation, including commercial invoices, packing lists, and certificates of origin, is prepared to meet international customs requirements.

Quality Assurance

We are committed to supplying reliable parts that meet the high demands of the global industrial market.

• Manufacturing Standards: Components are produced using precision tooling and strict quality control processes.
• Testing & Inspection: Each batch undergoes machinery tests. Video outgoing-inspection reports can be provided to verify quality before shipment.
• Warranty: Backed by a 6-month warranty against manufacturing defects, providing peace of mind for our B2B customers.
• Post-Sale Support: After-warranty service includes online technical support for installation and application queries.

FAQ

Q: How can I confirm this thermostat fits my specific Yanmar engine?
A: Please verify your engine’s model number is 4D84 or 4D88. Cross-reference the existing thermostat’s part number with our listed OEM numbers (129155-49801 or 129155-49800) for a guaranteed match.

Q: What is included in the quality inspection before shipment?
A: Our inspection includes dimensional accuracy checks, functional testing of the thermostat’s opening/closing temperature, and a visual inspection for defects. A machinery test report is provided, and video outgoing-inspection is available upon request for bulk orders.

Q: Do you offer support for installation or troubleshooting?
A: Yes. We provide online technical support. For installation, always ensure the engine is cool, the cooling system is properly bled after installation, and you use the correct coolant mixture as specified by Yanmar to ensure optimal performance and longevity of the part.

Our advantages

1.An authorized wholesaler of Isuzu genuine parts, Hino genuine parts, Mitsubishi genuine parts and Mahle parts.

2. We are not only supply genuine parts, but also high quality OEM parts, which are made in China or made in Japan.

3. More than 10 years of experience in machinery parts, professional supply of diesel engine parts.

4. Fast delivery, the fastest can be shipped in one day ,more than 500,000 of different types parts in stock.

5. Scientific ERP system, easy and fast to locate the parts that customer needs.

6. Professional technician checks the parts before delivery, to make sure the parts are correct, usable and defect-free.

Exhibition

Packing&Shipping

1.  Our shipment is by air/sea/express (DHL/FEDEX/TNT/UPS/EMS).

2.  Once we get confirmation of payment, we will ship products in 2 days.

3.  Our packaging is standard export wooden box or others as your requirement.

4. We’ll check and test the products before shipping , and givethe pictures to our customers to confirm.

FAQ

Q1. What is your company major products?

A: Our main products are Liner kit, Piston, Rings, Liner, Gasket kit, Bearing, Injection pump, Nozzle, Water pump, Oil pump,Crankshaft, Turbocharger,Filter, etc.

Q2.What is the MOQ?

A: Normally we can supply any quantity if we have in stock.

Q3. What is your payment term ?

A: We accept Western Union, T/T, Paypal.

Q4. What is the packing ?

A: Carton or wooden case , If you want to put your logo on the packing , We will do it after get your authorization letter.

Q5. When can you deliver products after payment ?

A: By Express ,usually might take 3-4 days ;By Air , Usually take 7-9 days ; By Sea ,usually take 1-2 months .

Q6. What can you do to complete order perfectly ?

A: In the beginning , We will communicate with clients in details to understand what they need .

Before packing , We will check the products and send photos to clients .After confirmation ,

We will packing products well to avoid damage . Once we get tracking number ,

We will send it to customer and keep contact in with clients .