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Why overhaul the engine after the cylinder pressure is inadequate?

The pressure of a cylinder or less. Troubleshooting: - general circumstances, the cylinder pressure less than the following reasons: 1) the piston ring assembly is not correct, there are corresponding phenomenon; 2) piston and cylinder liner of the gap is too large; 3) valve head and Bad valve sealing seat; 4) valve spring free length limit is reached; 5) Improper valve clearance adjustment: 6) is incorrect when the sign assembly. In accordance with the principles from simple to complex, first view the timing marks, timing marks are correct. Re-adjust valve clearance, and then test cylinder pressure,[link widoczny dla zalogowanych], cylinder pressure does not change. Because of the engine has just been overhauled, and the engineers have been testing procedure debugging, so the first two conditions is unlikely, it is temporarily not be considered. Next, we decided to break down the cylinder head for further testing. Remove the valve spring and air t'-3 ~, measure the width of the gas door, meet the standards. Check the valve head does not sink phenomenon, the valve rod and valve guides with the gap is also normal. Measuring valve spring free length of 49.1mm (standard length is 49.8mm, limit the length of 48.8ram), within the specified range. After a series of tests found no problems, so calm down and re-53 \The analysis showed that the indicators are normal, the technical parameters were also within the scope of the regulations, which cover the full proof of all parts of the cylinder there is no cause failure. The only doubtful is a positive sign when the assembly is wrong. When the token is incorrect, would result in deviation of valve timing, so that the piston is at TDC, the valve to open as early as the phenomenon occurs, and thus make less cylinder pressure. Based on the above considerations, we will move the camshaft timing gear assembly of a tooth again, and then test the results of cylinder pressure rise. After a gradual adjustment, and finally sign off the camshaft timing gear assembly after five teeth, the engine's cylinder pressure up to the standard value, the engine work properly. Cause of the malfunction of the engine is the camshaft timing gear timing mark is wrong. Maintenance Summary: Analysis of failure cases excluded from this process, we get the following inspiration, resulting in vehicles are many reasons for failure, can be both operation and maintenance of vehicles is the problem of vehicle or parts may be shipped to a problem. Therefore, the maintenance work we have to do the following: 1) should have a rigorous and meticulous work style. In troubleshooting, comprehensive application of methods and means, and follow a certain sequence step by step investigation to avoid more detours, and reduce the workload and reduce maintenance costs. 2) The bold vision to be good at, ~: -3-- breaking mindset. Some issues may be rare in peacetime, it is difficult to think of. Therefore, in the diagnosis of failure to overcome the set thinking, bold vision, and in accordance with the actual situation of each vehicle carefully 53 \As in the above example,[link widoczny dla zalogowanych], the beginning is a mistake to think that manufacturers of certain types of marks is correct, do not have to wonder, why they take a detour. 3) to strictly comply with the maintenance process. The maintenance work, vehicle maintenance should be strictly in accordance with the manufacturers of the provisions of the technical requirements and operate a variety of technical parameters, so that we complete the project on their own to more of a confidence, which will help analyze and identify the fault as soon as possible the real reason. Population study in which the following two reasons: First, without careful analysis of inspection to blindly replace components, first, by the experience of the impact of previously encountered such a situation,[link widoczny dla zalogowanych], the replacement control module problem is solved, it is not plus the previous practice of copying: the second is the easy way, to take a \This approach not only inefficient, but the owner will lead to unnecessary economic losses. Such phenomena are very common in the automotive repair industry, should be firmly stamped out. Second, although for some analysis and inspection, but not complete. First, understanding the mechanism of motor control module is not enough, the second is directly controlled by the traditional power of the motor, many people mistakenly believe that no matter what kind of control,[link widoczny dla zalogowanych], as long as the normal power supply and grounding, but also lowering control signal, motor would certainly be able to work, so check in often rush to just check the line voltage that three soon to judge, not knowing that the module would also like to increase the signal line voltage under the circumstances and the motor position to make a final decision. In this case, just the failure of the motor control module of the three line voltages are correct, it resulted in miscarriage of justice. (Author: Shantou City Polytechnic)
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