In the daily maintenance Small crane, occasionally encountered engine smoke, this is obviously because of the machine caused by a lack of motivation, underpowered directly affect the normal small crane operations.If no matter don't ask, in lifting weight lifting operations if need larger objects, consequences.
So, why are the machine running out of steam?In general diesel engine power is insufficient, mostly because of the lack of gas pressure in the air cylinder, fuel supply system failure.But the cause of these problems are many, specific should be analyzed according to the practical situation of screening:
-
Observe whether the combustion chamber is air leakage
The engine running for a while first, after being into a state machine completely engine stalled.Use shake handle shake the crankshaft, according to the work order of each cylinder, judging by the laborious degree of each cylinder gas pressure, if there is a clear feeling small resistance, a cylinder that underpowered because combustion chamber blow-by, common flat parts are:
A、 hole leakage, fuel injector base
Diesel engine at run time if you see the hole of a gas jet nozzle base, and fuel injector shell temperature is higher, so that the injector base hole leakage.
Causes of injector base hole leak too much mainly because of the accumulation of carbon in holes or is the result of a damaged seal deformation.If it is the former, you can return to normal after clear in time.If the latter, you need to replace the gasket, if there were no new short change, can be the old washer after burn red water cooling, restore the elasticity of the gasket, it can also solve the problem.
B、sook, cylinder gas leakage
When working in the diesel engine, if found near the cylinder sook bubbles appear, then that is cylinder sook external leakage.Bubbled if tank, water tank water steaming, at white smoke of diesel engine exhaust pipes tiny water droplets, and so on and so forth.Then that is cylinder gasket between the cooling waterway cylinder head damaged.This time should be carefully check the working state of the cylinder head and cylinder head bolts and other components, analyzes the reasons and handle in time.
C、air leakage between piston and cylinder wall
If a combustion chamber blow-by is not reasons, then can be inspected a cylinder injector removed, to install the hole pour into a small amount of oil.Installed again, shaking the crankshaft, if feel is shaking resistance increased significantly, it means that is because of the large clearance between the piston and cylinder wall caused by gas leakage.Usually the cause of this problem is because the piston ring work not cool or cylinder liner wear caused by d, valve leakage
Inspection by oil cylinder gas compression force and not change, so should check valve is a flat.Check valve leakage and the exhaust valve leakage ways, usually in the only remember running, inlet pipe hot feeling, and tube have applauded "" voice, see the air filter smoke, so that means that as air leakage between inlet valve and seat.Rong exhaust pipe place to hear the sound of the "PI", and the exhaust pipe of Mars, it means that is between the exhaust pipe and valve seat leakage.
-
Whether the exhaust work normal diesel engine work, want to have enough air in cylinder can make full combustion of the fuel, enough power.If insufficient intake in the cylinder, fuel combustion is incomplete, is bound to make diesel engine running out of steam.Similarly, if the exhaust gas in the cylinder do not row, is bound to affect the volume, also decreased the diesel engine power.Inflate cylinder, a common cause of exhaust is not enough, is more for inlet and exhaust gap is too big, but the air filter, intake pipe and exhaust pipe blockage, is also a factor which cannot be ignored.
-
Check the oil supply system for fault practice has proved that if the above two aspects of judgement through inspection technology are normal, the causes of the diesel engine power shortage clearly lies in the fuel oil supply system.At this point, both may be injector fuel injection adverse, it is possible that the oil supply is insufficient, or delivery time is not correct.
In the maintenance work, mostly check diesel fuel delivery advance Angle to judge whether fuel supply time timing.At the scene of the actual work is a kind of commonly used the most simple method: observe the end of the fuel injection pump fuel injection time and the piston to the check point on the compression stroke time.If inconsistent, as long as give it to basic consistent, the fuel delivery advance Angle can basically ensure use, although accuracy with less when the instrument calibration.Check, if the two time is not consistent, namely the piston to the check point on the compression stroke, the fuel injection pump fuel cut-off or continue to fuel injection for a long time in advance, then fuel supply time too early or too late, all needs to adjust.
Zhengzhou Kebu Technology Co.,Ltd. Is China's domestic engaged in the narrow space with mini crawler crane production research of professional manufacturers.Company production of mini crawler crane with independent intellectual property rights, patent number: ZL 2009 2009 X.And has a number of mini crawler crane patent production technology.Products are mainly used in the narrow space of the car engine workshop equipment maintenance, electric power maintenance, chemical workshop maintenance, building curtain wall installation, the construction of the high speed rail station, and cemetery stone industry situations in the narrow space.If you are interested in our products, please contact us, the hotline: 0371-6371, 6261
