The failure of the cooling water in the radiator to leak through the radiator, water pump, cylinder liner, and other components of a diesel engine is known as leakage. The exterior leaking of a diesel engine and the internal leakage of a diesel engine are two different types of leakage. Body or cylinder head cracks and leaks, water tank cracks, and leaks, body, and water tank blisters leaks, water plugging water leaks, and water tank bolts are all common causes of external leakage. water leaks can be used to tighten bolts, and welding It is possible to solve the procedure of mending and applying sealant.
Diesel Engine Internal Water Leakage
The Cylinder Liner Seal Leaks
The cylinder liner of a diesel engine has two or three sealing rings. The following are the causes of the leak and possible solutions: ① The sealing ring’s diameter is significantly different or has other faults, causing the sealing ring to leak water. Replacement of qualified sealing rings is required. ② Be careful not to twist the sealing ring when constructing it since it will be twisted owing to poor installation. ③If hard items are lodged in the groove of the cylinder liner sealing ring, the sealing ring will deform and the sealing function will be compromised. Hard objects or garbage should be removed at this time. ④ The diameter of the bottom of the sealing ring groove of the cylinder liner is too tiny, causing the sealing ring to leak water. To remedy the problem, wrap an appropriate amount of raw material tape around the bottom of the sealing ring groove before installing the sealing ring. ⑤ The body hole at the cylinder liner sealing ring junction is not well inverted or has no inverted angle. The sealing ring is cut when the cylinder jacket is put into the body, resulting in water leakage. It should be aligned with the hole and reversed at this point before entering. The inverted angle of this line assembly is 20°, and the inverted angle is 4 mm long.
Cylinder Head Gasket Leaks
①After a long period of usage, the carbon deposition on the cylinder head gasket is severe, and the sealing performance is poor. A new cylinder head gasket should be installed at this time. ②The cylinder head gasket will leak if the combination of the body and the cylinder head is uneven, the roughness is poor, and there are scars or dirt on the joint surface. The cylinder head’s body or combined plane can be scraped or ground at this phase to eliminate dirt, maintain cleanliness during assembly, and tighten the cylinder head nut to the specified torque. ③The displacement of the water channel hole of the body and the water channel hole of the cylinder head is relatively high due to the incorrect datum plane used during cylinder head machining or poor casting quality, and the cylinder head gasket cannot cover the water hole. In this situation, dislocate the cylinder head gasket to solve the problem. If the problem persists, the cylinder head should be replaced. In Landtopmall, the cylinder head for Yanmar 3tnv70 is a good choice.
Other Sections Leaks
Blisters form between the water and oil passageways near the cylinder head, shrinkage holes form at the holes of the sealing water ring, blisters form between the holes and the crankcase, and blisters form between the cylinder head inlet and exhaust valve seats. Water leakage will occur due to cracks between the cylinder head water channels and the inlet and exhaust ports, blisters at the inlet and exhaust ports, and a fractured cylinder liner. The source of the water leak is discovered after the inspection, and regardless of the type of failure, new parts should be replaced to eradicate the defect.
Diesel Engine External Water Leakage
The radiator is dripping water. The majority of radiator leaks are caused by coolant corrosion, particularly leaks in radiators with a service life of more than ten years, which are mostly caused by corrosion. As a result, the coolant quality is critical and has an impact on the radiator’s service life.
Water Pump Leakage
The water pump is leaking water. ①If the water pump casing is fractured, drill holes at both ends of the crack, open a “V”-shaped slope, and weld the crack using a cast iron electrode. ②If the seat hole in the bearing or bushing is worn, the big seat hole can be bored and put into the bushing, then treated to the standard size. ③If the contact plane between the water pump housing and the sealing gasket has scratches, black spots, grooves, or unevenness, it can be turned on a lathe. ④The water seal has been compromised.
Ceramic materials are used in some engine water seals because they are wear-resistant and have the good sealing ability, although they are fragile. Under high-temperature conditions, cool water will be added rapidly if there is a scarcity of water during operation, and the water seal will be brittle. resulting in water leaking The engine must be idling, cooling water can be gradually added once the temperature has reduced, and the fan belt tension must be adjusted on a regular basis.
Leakage in the Body and Cylinder Head
Cracks in the body and cylinder head cause water to leak. When an engine runs out of water and becomes overheated, adding cooling water too quickly will cause the body and cylinder head to explode and leak water. It is simple to freeze the body if you fail to turn off the cold water when stopping at night in the winter.