Common program analysis of the most popular Cummin

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Analysis of common procedures for Cummins diesel engine fault

troubleshooting is a systematic project, so Cummins diesel engine should be regarded as a whole (a system), not as a group of components. To master the whole situation of the fault, it is necessary to fully understand from the operator, observe the diesel engine, make necessary inspections and make analysis that can point out the cause of the fault

understand the fault phenomenon

first, listen to the fault report and understand the fault phenomenon. Some faults may have vague symptoms, while others may be specific

although there are many faults that can be quickly and simply understood through the extensive use of very new materials, some maintenance personnel will think of some examples, and the first conclusion of fault analysis can not eliminate these faults. These situations occur because some important situations are not known or ignored

for maintenance personnel, they must ask the employer, especially the actual operator, so that you can fully understand the fault problem. There are some situations that only the operator knows, and you must know them. There are other situations that can only be found by observing the running diesel engine or removing some parts

you may recall that some similar faults are eliminated by a special method. However, the same fault may not always be handled in the same way

the maintenance personnel can learn the information required for fault diagnosis by asking questions from the following:

1. diesel engine service condition

is there any abnormal noise before the fault occurs? Load or light load operation? Acceleration or deceleration? Has the oil pressure or water temperature changed

is there abnormal dust or smoke at that time? What are the climatic conditions? How strong is the wind

what was the road grade at that time? What about the first detected fault? How much oil, fuel and coolant are consumed? What has changed recently? What is the smoke concentration

is the diesel engine throttle sensitive? Is the deceleration normal? Is the shutdown satisfactory? Is the cold start satisfactory? Have you ever stalled or misfired

what kind of fuel is used? What is the grade and source of fuel? Will it surge when idling or running at full speed? Aim at the advanced technology of international automotive lightweight materials? Can it be idled for a long time

2. maintenance history

has the diesel engine been repaired recently? What kind of maintenance

has this fault occurred before? When was the last adjustment? When did you change the oil and fuel filter recently

is the maintenance system strict? How to obtain and store fuel: what is the maintenance category and the level of lubricating oil used

how many kilometers or hours did the diesel engine run? Who will repair and adjust it

when changing the oil filter, have you inspected the filter element of the full flow oil filter? Any metal impurities found

3. observation results

is the diesel engine clean or dirty? How tight is the belt? Is there any oil, fuel or water leakage outside? Have you ever overheated

whether there has been any temporary repair on the diesel engine (the parts are not fixed. Company functions: tight, parts are damaged, etc.)

what is the sound of the diesel engine at idle speed? Is there any wobble in the pulley? Have you repaired or replaced any parts recently

are there any non-standard or non-standard parts on the diesel engine? Are there any defective pipes

are the oil level, water level and fuel oil level satisfactory (if bearing problems are involved, pay attention to the oil condition. This has happened before. The bearing is damaged due to insufficient oil, and the operator only injects new oil into the crankcase afterwards)

during disassembly, is there any peculiar smell, carbon deposit, oil sludge in the diesel engine, and is there any other adverse condition under the rocker cover

4. problems to be considered by the mechanic before maintenance

simply ask and understand the situation, and can not solve any problems. Therefore, before maintenance, it is necessary to understand the conditions related to the fault and see the interdependence of each problem before making judgment

using all available and existing test instruments is helpful for the thinking process (thinking), but it may not always be used

the mechanic must be familiar with the diesel sail model, equipment model and operation knowledge. Equipment on diesel engine, such as torque converter, cooler and stepless governor, must be considered

most diesel engine users are disgusted with the loss caused by the shutdown and early disassembly without establishing the relevant material product standard system, so they should pay attention to the planned and targeted maintenance, and make each maintenance complete and successful

as any problem with any part of the diesel engine may affect the operation of the whole machine, you must have rich experience in identifying the operation of the diesel engine. The important condition for successful troubleshooting is to use your knowledge about the operation of the diesel engine and its parts to solve the problem. This is an intelligent operation research activity

it is not difficult to carry out some inspections when looking for and removing faults, and the inspection data must be related to the faults. It can't be said that the diesel engine in front of you has the same fault as a diesel engine last week. It is assumed that the cause of the fault is the same

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