Daihatsu diesel engine parts of technical improvement

Daihatsu diesel engine parts of 2019 - technical improvements 03 - Ship 25 Li Jianding is: 'environmental protection 1' round a why, host, seawater cooling system improvement to improve the water cooling system? I ship on June 14 years in the factory, find the right host inlet manifold in September 15 years with salty water drain valve is too high, there are white crystals, the drain tube exit as cold damage leakage, seal tube into the factory on September 18. After 16 years in January right host inter-cooled leaking hand factory replacement of heart again. In march left host cold water replacement of heart. In late may and early June inter-cooled left and right of the host device has found leaking events leading to seal tube factory. And both cold machine is new! With manufacturers are also quite seriously, in November 8, local renovation in sea water cooling system. 1. Host water filter element mesh to small, from 8 mm to 6 mm. Try to avoid big dirt particles into the heart, causing wear and tear on the copper tube. 2. In the upper cold device by a vent line to the sea near the overboard discharge valve. The purpose is to eliminate inter-cooled implement in the air. 3. Water from tanks into the automatic pressure control valve to knowing the outlet in the device. Normally ship adjustive inter-cooled device are installed into the side and the outlet valve, the outlet to install a regulator, to achieve the purpose of adjusting the inlet temperature. Through such modified my understanding is that the original automatic control valves in the process of regulating the circulation area of the sudden decrease of on the back of the valve core is easy to cause local low pressure area, precipitation that dissolve in the water capacity of gas and the cold cause cavitation corrosion. To affect the cold machine service life. 4. Replacement of heart. It's Japanese, the change of cold, on the other hand there is something wrong with the quality of the original cold. The picture shows the water cooling system accessories. 2: the camshaft oil modified recently we found that the host has left the flywheel end of the oil. Within the port operations would not normally dumped oil, but long time in the operation of the high speed would file now this kind of phenomenon. After we have observed determine host shaft seal oil leakage caused by oil flywheel. Daihatsu machine adopts the shaft seal is a labyrinth seal, the causes of oil leakage of the shaft sealing are: 1. Crankcase vent pipe ventilation adverse crankcase pressure is too high. 2. The camshaft oil return too much into the shaft seal. 3. Labyrinth seal wear itself caused bad shaft seal. 4. Cylinder piston wear air leakage between the crankcase pressure is too high. For new ships, 3, 4 is unlikely. The service provider for camshaft oil return for modification. Oil return the original of the camshaft is through the body on the oil return hole directly back to the crankcase, its position in the location of the flying cylinder shaft end is 1, thus increasing the likelihood of camshaft oil into the shaft seal, to seal a burden. In order to improve this situation, the location of the service provider in the oil return hole installed a diversion pipe can make the camshaft oil return along the protruding handle box wall flowing downwards, never achieve good working of the shaft sealing system. Are worthy of that two points: 1. Solve the flywheel to jilt first light oil should consider is the crankcase ventilation tube was clear. Which checks on the vent pipe gas liquid points in the oiler clean ball is dirty plugging, generally change clean oil phenomenon can effectively control the ball. 2. The camshaft oil nozzle is best solved by service providers. Because when installing a camshaft oil nozzle to punch fixed nozzle on the body. The picture shows the camshaft return pipe ( Source: the oil barge port wheel)