General diesel engine fault repair method

Comprehensive diesel engine fault diagnosis:

First, the diesel engine is difficult to start: The main cause of the difficulty in starting is the failure of the fuel system or the compression system.

1, failure reasons:

A fuel system has air? The diesel filter is clogged with impurities and dirt.

B diesel oil viscosity, ambient temperature is too low, diesel fluidity is small.

C diesel oil deteriorated, there was water, diesel could not burn effectively, and diesel engine started difficultly.

D Combustion chamber insert holes are blocked by carbon deposits.

E. The fuel supply advance angle is not correct, and the camshaft cam is damaged so that the supply of oil is reduced.

F Outlet valve wear is serious and the outlet valve gasket is damaged or not tightly sealed.

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Second, the failure of the compression and gas distribution mechanism; it belongs to the breakdown of the compression and distribution mechanism:

The main organism, the cylinder head is seriously deformed, the cylinder mat is aged, and the deformation or manufacturing is not possible; the tightening torque of the bolt is too high or too low, causing a leaky seal.

A cylinder liner, piston, piston ring wear is serious, the cylinder gap is too large, the piston ring edge clearance increases, the piston ring opening steering, the opening gap is too large, the piston ring coking, biting dead, resulting in cylinder leak.

B The timing gear is incorrectly mounted, the mark is misaligned, and the valve timing is disordered.

C Regulator over-tightened, resulting in lax valve leakage and air leakage.

Third, the fault diagnosis, should be familiar with the structure, find out the principle, from Jane to Fan, from the outside to the inside, according to the system steps, gradually analyze and determine the cause of the failure, and resolutely avoid chaos disassemble unloading.

Fourth, since the oil supply system is easy to inspect and is prone to failure, it is generally checked from it first, and finally the compression valve mechanism is checked.

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