Diesel generator maintenance training diesel engine -p22-p24 cylinder liner malfunction 2

Diesel generator maintenance training diesel engine -p22-p24 cylinder liner malfunction 2

2 diesel generator cylinder sleeve assembly is not correct. This situation will cause the gap between the cylinder liner and the body to change the cylinder liner in the body to produce a skew phenomenon.

The main reasons for the occurrence of cylinder pull in diesel generator cylinder liners are:

1 The gap between the piston and cylinder liner is small.

2 The maintenance of the break-in period has no technical requirements.

2 The piston ring cut clearance of the assembly is too small.

4 There are more solid particles in the oil.

7 When there is no oil pressure or low oil pressure

The main causes of cavitation erosion in diesel engine cylinder liners are:

1 There are casting defects.

2 The clearance between the cylinder liner and the piston is too large.

2 The clearance between the cylinder liner and the body is too large

4 cylinder liner fault inspection method

Check the cylinder sleeve cylinder is generally used to observe the cylinder head dismantled after the cylinder liner to observe whether there is a stack of different grooves. If grooves appear, the cylinder liner has caused a cylinder pull.

The following methods can be used for inspection when diesel engine cylinder liners are seriously worn out; 1 Judgment is made based on the operating time and working environment of the diesel engine.

2 According to the diesel generator diesel engine failure phenomenon (such as significantly reduced power, take the fault analysis method.

2 Observe after removing the cylinder head, that is, using observation method.

4 The internal diameter of the cylinder liner is measured with an internal diameter dial indicator. The method is to take four different positions. Then the internal diameters of the four positions are measured. The measured values ​​are compared with the technical parameters, and finally it is determined whether severe wear occurs. The inspection methods for cracks and cavitations are as follows; 1 Fault analysis can be used.

2 observation method can be used. After removing the cylinder head

Touch the inner wall of the cylinder liner with a flashlight or touch the inner wall with your hand for inspection.

7 Remove cylinder liner with cylinder liner

The inspection method examines the outer wall of the cylinder liner.

5. How to deal with cylinder liner faults

The diesel engine cylinder liner is an important component of the diesel engine. The quality of the cylinder liner directly affects the technical performance of the diesel engine. In order to ensure the technical standards of diesel engine cylinder liners, for a repair shop or a small maintenance department that does not have a condition, when a cylinder liner is found to have one of the above-mentioned phenomena, it is generally necessary to replace the new cylinder liner of the same model.

6. Disassembly of cylinder liner

When it is found that the cylinder sleeve has failed, first remove the cylinder head, and then use the cylinder sleeve puller to remove the cylinder sleeve from the body, as shown in Figure 2-20.

7. Assembly of cylinder liner

After the cylinder assembly of the diesel generating set has been measured and inspected, the cylinder sleeve is first fitted with a copper sealing gasket or an aluminum gasket under the upper shoulder of the cylinder sleeve, and a rubber seal is fitted in the lower annular groove, and then the sealing ring is integrated. A layer of engine oil, with a dedicated upper or horizontal plank press the cylinder liner into the body, as shown in Figure 2-21.