Products Description
This batch of Yanmar 4TNV94 original used dismantled engines are all dismantled from second-hand small excavators, most of which are used for intermittent earthwork operation, and we have strictly screened out machines with long-term high temperature and water shortage, continuous heavy load operation.
The whole engine maintains the original factory original assembly, the cylinder block and cylinder head have no cylinder head disassembly overhaul, no cylinder boring processing, no assembly and refurbishment using non-brand parts, and no paint spraying to cover up leakage problems.
This model has very obvious inherent shortcomings: the cooling water circuit is prone to scaling and blockage, and once the water temperature is high, the cylinder head gasket is easily blown, resulting in oil-water intercommunication; long-term inclined operation is prone to oil leaking into the cylinder, causing white smoke when the engine is cold; the oil pressure is easy to drop when the engine is hot, and the bearing wear speed is fast. In addition, poor atomization of the fuel nozzle will cause unstable idle speed and weak power, and after the piston ring is worn, the blow-by will increase and the oil consumption will exceed the standard, which are also high-incidence problems.
We have conducted special inspections for the exclusive faults of this model: monitor the change of oil pressure during the whole process of cold & hot engine operation, conduct water circuit pressure test to check the hidden danger of cylinder head gasket blow-by, actually measure the four-cylinder cylinder pressure to keep consistent, inspect the cylinder wall for scoring through an endoscope, and check the exhaust gas volume of the crankcase at the same time. All engines with high temperature water leakage, insufficient oil pressure when hot, excessive exhaust gas and oil burning are eliminated. The original factory installation dimensions are completely consistent, and the construction machinery can be directly hoisted in-situ, no need to modify pipelines and brackets, supporting retail purchase and bulk order.
2. Technical Parameters
| Parameter Item | Specification |
|---|---|
| Engine Model | Yanmar 4TNV94 |
| Displacement | Inline 4-Cylinder Diesel Engine |
| Quality Inspection Standard | Balanced cylinder pressure of the four cylinders, smooth cold start, stable oil pressure under cold and hot working conditions, no cylinder head gasket blow-by and water leakage, no cylinder wall scoring, low exhaust gas volume, normal oil consumption, no leakage in all oil and water circuits |
| Stock Status | Sufficient stock, support retail orders and bulk orders |
3. Applicable Models & Equipment
Hyundai 60, XCMG 60, Doosan DX60 small excavators
Agricultural construction machinery, crawler engineering equipment
Power assembly replacement for small diesel generator sets
4. Frequently Asked Questions (FAQ)
Q: When purchasing the 4TNV94, what unique faults of the model need to be most avoided?
A: The biggest weakness of this engine is the cylinder head gasket blow-by caused by poor heat dissipation, which is very easy to cause oil-water mixing; secondly, long-term construction of the equipment at a large angle will cause oil to pour back into the cylinder; another common fault is that the oil pressure is normal when the engine is cold, and once the temperature rises, the oil pressure drops rapidly, and the bearings are easy to wear. We focus on the water circuit pressure test, comparative detection of cold and hot oil pressure, combined with cylinder pressure and in-cylinder borescope inspection, to eliminate the machines with hidden faults.
Q: How to identify whether the engine has been disassembled and overhauled?
A: The screws of the cylinder head and oil pan retain the original factory assembly marks, and scratches will be left as long as they are disassembled. Before shipping, we can provide real-shot photos of the body steel stamp, cold and hot engine test run videos, cylinder pressure data and in-cylinder borescope images, one engine one number, and the information can be checked one by one.
Q: Do I need to modify the installation brackets and oil pipes when replacing the new engine?
A: The motor mount holes and oil pipe joints are all original factory standard specifications. After removing the old engine, it can be directly aligned and installed, no modification and debugging required, and it can work normally after installation.
