The diesel engine starts "six does not take""

When starting, place the throttle at the maximum position. For a diesel engine equipped with a full program governor, when the throttle is increased to a certain position at the start, the fuel supply of the injection pump has reached the maximum. Even continue to increase the throttle, the fuel injection pump will not increase, while the governor spring preload has increased, so that the diesel engine after the start of a sharp increase in speed. But the diesel engine start temperature is low, the lubrication condition of the friction surface is relatively poor, so the diesel engine start to enter the high-speed operation, will inevitably increase the movement of the Deputy wear, and even lead to burnt axle and other major fault. Therefore, when starting the diesel engine, the throttle should be placed at the 2 / 3 position of the positioning plate (this position is the maximum fuel supply at the injection pump), without increasing the throttle to the end, so as to avoid the high speed after the diesel engine starts. If the technical condition of diesel engine is poor, the throttle can be enlarged appropriately, but it should not exceed the 4/5 of the locating plate.

Two, slope start diesel engine. The boot device is a problem (battery shortage, starter or startup circuit fault etc.), some machine hand is not timely repair, but take the method to let the locomotive slip slope, through the driving wheel drives the engine rotation, the diesel engine start. As we all know, often take the slope slope start, and its disadvantages are many. The main hazards are: diesel engine without preheating process, if a longer time to stop, the friction surface of the lubricating oil has been lost, the film suffered serious damage, the diesel engine suddenly for high-speed operation, lubricating oil can not be sent to the friction surface, exacerbated by mechanical wear and tear. When the slope is started, the clutch, gearbox and other transmission parts are easy to be damaged due to the excessive engagement of the clutch. The diesel engine must be braked urgently after starting, which will affect the service life of the parts of the brake and the running mechanism, especially to speed up the wear of the tires. Moreover, after starting, the vehicle speed is higher, and it is prone to accidents.

Three. Preheat the air with an open flame when starting. In winter, the diesel engine is difficult to start, some machine hand to remove the air filter on the cover, the lighting of a tarpaulin in the intake pipe mouth, in order to improve the temperature of the air entering the cylinder. Although this method helps the diesel engine start, but also can cause some harm. The main hazards are: with flame preheated air, the air entering the cylinder without a filter (dry centrifugal filtration) filtration (or even some machine hand in the cylinder head of an ignition), containing impurities in the air directly into the cylinder, aggravate the wear of cylinder liner and piston, piston ring and valve, the valve seat and other parts. And burning smoke into the cylinder, easy to form carbon deposits. Remove the air filter every time it starts,

It is easy to cause the air inlet pipe to be blocked tightly and produce air leakage, which will cause some air to enter the cylinder without filtering, which is very unfavorable to the operation of the engine. Fire start is not conducive to safety, especially some old locomotives, oil leakage is serious, easily lead to fire. When starting at low temperature, the diesel engine can be preheated and heated by adding hot water to the cooling system and baking the oil pan with dark fire.

Four, add oil to start the diesel engine. That is, before starting, add a little oil to the intake pipe to improve the sealing performance of the parts in the cylinder, which is beneficial to start the diesel engine. For a badly worn diesel engine, this method of starting can work for a while, but the negative effect is obvious. If this method is often used, it is easy to cause the piston ring to be cemented and stuck in the ring groove, and the carbon in the cylinder will also increase in large quantities. The correct way to deal with this problem is to repair or replace the worn parts in the cylinder in time to restore the good sealing performance of the cylinder.

Five. Start the diesel engine without cooling water. The start method of the engine damage is particularly serious, because the engine in the outbreak of the moment, the cylinder temperature can reach 2000 DEG C, the temperature is not only reflected on the water table is out, touch the cylinder body feel. It can be inferred that the temperature of each wall of the combustion chamber will rise immediately after the ignition of the engine (about 500 degrees -600 degrees Celsius). At this point, sudden cold water is added to the engine, and the wall of the combustion chamber is suddenly contracted, which can easily damage the cylinder head (broken between the two air doors of the same cylinder) and the cylinder liner (broken under the shoulder of the cylinder liner).

Six. Start with a tractor. Drag before the car starts, the general low gears, after car speed (speed of diesel engine, lower initial) using the driving wheel and drive the diesel engine rotating through the transmission mechanism, the diesel engine is started. The harm of the starting method is as follows: once the locomotive is pulled and started, the high-speed gear is hung; once it is started, it is bound to dash forward and collide with the front car easily. Because the locomotive lubricating oil viscosity initial resistance, especially in the cold season, often driving wheel slippage, the tire wear. In the process of starting, it has to take many ways of separating and combining clutch, which lead to the damage or serious wear of clutch parts. If the engine does not start for a long time, it will cause a large number of diesel oil to enter the cylinder, erode and destroy the lubricating film on the cylinder wall, and aggravate the wear of the cylinder liner, piston ring and piston. At the same time, the diesel oil which is penetrated into the crankcase will dilute the lubricating oil and reduce the lubrication quality of the lubrication system.

At present, there is a low starting point fuel on the market. It is made up of 70% ether, 27% solvent oil (or aviation kerosene) and 3% engine oil, and its self ignition temperature is 191 degrees centigrade. The ignition temperature is 200. start-up