Product Details

Certified Yanmar 4TNV94 4TNV98 Thermostat 129907-49800: High-Quality Replacement for Excavator Engine Parts

Solving overheating issues and ensuring optimal performance for your 4TNV94 and 4TNV98 diesel engines.

Email for Inquiries:

Manufacturer Direct: Custom Engine Component Development

As a source manufacturer specializing in foreign trade export, we support the customized development of various engine cylinder liners.

Caterpillar 3116 Cylinder LinerKomatsu 6D102 Cylinder LinerCummins QSB6.7 Cylinder LinerIsuzu 4HK1 Cylinder Liner

Precision Engine Cooling: The Yanmar 4TNV94 Thermostat

We specialize in offering premium replacement engine parts for heavy-duty machinery. Highlighted today is the critical Thermostat for the widely used Yanmar 4TNV94 and 4TNV98 diesel engines, essential components in modern construction equipment like mini-excavators and skid steer loaders. A malfunctioning thermostat can lead to engine overheating or undercooling, causing severe damage. Our High-Quality Replacement, typically carrying the part number 129907-49800 (also searchable as 12990749800), resolves these common engine temperature control issues efficiently. Trust our proven expertise in providing reliable, durable Yanmar parts that meet or exceed OEM specifications.

Core Product Specification: Thermostat

Brand	Engine Model	Product Name	Part Number	Alt. Part Number
Yanmar	4TNV94, 4TNV98	Thermostat	129907-49800	12990749800

Your One-Stop Shop for Diesel Engine Parts and Overhaul Kits

Honour Time Machinery Limited is your trusted partner for a vast inventory of cummins, komatsu, Caterpillar, isuzu, kubota, yanmar, and weichai engine components. From essential liner kits and piston ring sets to complete engine assemblies, we have the quality parts you need for scheduled heavy equipment maintenance. We stock everything from main bearings, connecting rod bearings, and thrust plates (components of a full overhaul kit) to complex systems like diesel pumps and fuel injectors.

Liner KitPistonPiston RingGasket KitGasket HeadCrankshaftValve GuideNozzleEngine BearingPressure SwitchFlameout SolenoidMonitorRadiatorMain ValveBeltCylinder BlockValve SeatAccelerator MotorTransmitterFan Cooling

Key Features of our Yanmar 4TNV94 Thermostat

Engine Compatibility: Perfectly calibrated for Yanmar 4TNV94 and 4TNV98 engines, ensuring accurate temperature regulation.
Application Versatility: Use for excavator or construction machinery operating in diverse environments.
OEM Cross-Reference: Direct replacement for Yanmar Part Number 129907-49800, guaranteeing fit and function.
Reliable Performance: Built with high-grade materials to prevent premature opening/closing, a common cause of 4TNV94 overheating solution needs.
Quality Assurance: Each unit is inspected to prevent leaks and ensure stable coolant flow, critical for engine longevity and performance.

Engineering Machinery Terminology & Components

Understanding your heavy equipment engine overhaul kit is crucial. Here are key component definitions:

1. Piston Ring: Location: Grooves on the Piston. Example Keyword: Komatsu PC200-8 6D107 Piston Ring. Seals combustion gas and controls oil consumption.

2. Valve Guide: Location: Cylinder Head. Example Keyword: Caterpillar 320D C6.4 Valve Guide. Guides the movement of the engine valve.

3. Thrust Plate: Location: Crankshaft Main Bearing Cap. Example Keyword: Cummins B5.9-C Thrust Plate. Limits the axial movement of the crankshaft.

4. Fuel Injector: Location: Cylinder Head. Example Keyword: Isuzu ZAX200 4HK1 Fuel Injector. Sprays atomized fuel into the combustion chamber.

5. Water Pump: Location: Front of the Engine Block. Example Keyword: Kubota KX080-3 V3800 Water Pump. Circulates coolant through the engine and radiator.

6. Turbocharger: Location: Exhaust Manifold. Example Keyword: Weichai WP10G Turbocharger. Increases engine power by forcing more air into the combustion chamber.

7. Oil Pump: Location: Oil Pan or Timing Cover. Example Keyword: Yanmar VIO80 4TNV98 Oil Pump. Circulates lubricating oil throughout the engine.

8. Main Valve: Location: Hydraulic Pump/Control Block. Example Keyword: Komatsu PC300-7 Main Valve. Regulates hydraulic fluid flow to actuators (not strictly engine, but core machinery component).

9. Flameout Solenoid: Location: Fuel Pump. Example Keyword: Cummins 4BT3.9 Flameout Solenoid. Cuts off the fuel supply to stop the engine.

10. Cylinder Head: Location: Top of the Engine Block. Example Keyword: Isuzu 6WG1 Cylinder Head. Seals the top of the cylinder and houses the valves and combustion chamber.

Engines We Support: Wide Range of Engine Parts Model We Can Provide

Brand	Models
Komatsu	3D82, 3D84, 4D105, 6D95, 6D108, 6D110, 4D84, 4D95, 6D102, 6D105, 6D114, 6D170
KOBELCO / Mitsubishi H.I.	J05E, 6D34T, 6D16, J08E, 6D22T, 6D24T, 6D16T, 6D34, 6D24
CATERPILLAR	3114, 3116, C4, C6, 3064T, S6K, C7, C-9, C13
Mitsubishi	4D34, 4D24, K4M, S3Q2, 6D16, 6D24, S4KT, 6D40
ISUZU	3LD1, 4LE1, 4BG1, 4HK1, 6SD1, 6WG1, 4LE2, 4JB1, 6BG1, 6HK1, 6WF1
Yanmar	4D88E, 4TNE84, 4TNV88, 4TNV94L, 4TNE88, 4TNE94, 4TNV98, 4TNV106
HINO	J05E, J08E, V25C, EF750, P11C, V21C, H06CT, H07D
CUMMINS	QSB6.7, QSM11-C, B5.9-C, B3.9-C, QSM11, C8.3-C
VOLVO	D6D, D6E, D9E, D12D, D7D, D7E, D12E, D16D

Maintenance Corner: Preventing Yanmar 4TNV94 Engine Failure

Common Fault: Komatsu PC55MR-2 4D88E Engine Excessive White Smoke

A common issue for the Komatsu PC55MR-2 4D88E engine is excessive white smoke, often mistaken for steam. Detailed solution: This typically indicates unburned fuel (in cold weather) or, more seriously, coolant leakage into the combustion chamber. If the thermostat is functional and the engine still smokes excessively after warm-up, check the Cylinder Head Gasket Replacement Procedure. A damaged gasket allows coolant to leak. Replacing the gasket head is critical to prevent total engine breakdown.

Proactive Engine Maintenance Tips

Oil Analysis: Regularly test your engine oil to detect premature wear of components like engine bearing and crankshaft.
Cooling System Check: Inspect the radiator and ensure the Thermostat (12990749800) is replaced every 2,000 hours to maintain perfect engine temperature.
Fuel System Integrity: Use only high-quality fuel filters and check the nozzle and diesel pump periodically to ensure optimal fuel injection, preventing issues like the white smoke mentioned above. This is key for reliable diesel engine spare parts performance.

Product Inquiry & Shipping Details

General Product Information

Model NO.	4TNV94 / 4TNV98
Application	Excavator / Construction Machinery
Certification	ISO 9001, CE
Condition	New
Product Name	Thermostat (Part 129907-49800)
Transport Package	Carton
Specification	High Performance, Standard Size
Trademark	HTM (Honour Time Machinery)
Origin	China
Production Capacity	5000PCS/Year

Logistics and Payment

Payment Terms:

T/T, Western Union, MoneyGram

Delivery Methods (Fast Worldwide Shipping):

Express: DHL, FedEx, EMS, UPS or by Air / Sea

Connect with Us!

Visit Our Facebook Page!

Name

TEL

E-mail

Anything else you want to tell us

Locality

Purpose

About Honour Time Machinery Limited

Honour Time Machinery Limited is a leading global supplier of high-quality, durable engine assembly and engine spare parts for heavy machinery, specializing in brands like cummins, komatsu, Caterpillar, isuzu, kubota, yanmar, and weichai.

Message

Please enter your name.

Please enter a valid email address.

Please enter your phone number.

Please select your locality.

Please select your purpose.

Please enter your message.

​ Certified Yanmar 4TNV94 4TNV98 Thermostat 129907-49800: High-Quality Replacement for Excavator Engine Parts