The diesel generator set internal
combustion engine repair is a planned repair near the overhaul room, mainly to
balance the different service life between the various parts to ensure or
extend the interval between overhauls. The scope of work is between minor
repairs and overhauls. In general, it is to replace or repair 1-2 main
assemblies, check the technical status of the remaining assemblies, and
eliminate the faults, and make necessary adjustments and adjustments.
The basic contents are: changing
the filter element of the oil and fuel filter; adjusting the fuel injection
quality of the fuel injection pump (high pressure oil pump) and the injector
(mouth), grinding out the oil valve assembly; repairing the piston connecting
rod set and the governor , pump and oil pump, etc.; replace the piston,
connecting rod copper sleeve, bearing bush, valve, valve spring and lock piece;
etc.; correct the engine compression ratio.
Basic content and judgement
conditions of diesel generator set internal combustion engine overhaul.
Diesel generator engine overhaul
is a restorative repair. The main purpose of this paper is to restore the
dynamic performance, economic performance and fastening performance of the
diesel engine, to ensure the complete condition of the diesel engine, and to
extend its service life.
Its basic content is, repair or
replace crankshaft, connecting rod, cylinder liner, valve seat and valve duct.
Repair of eccentric bearings; replacement of plunger pairs, oil delivery valve
pairs and needle valve pair. Repair welding oil pipe and joints; repair water
pump, governor, remove water scale scale; inspect, repair, adjust lines,
instruments, charging generators and starter motors in the power supply system;
install, inspect, test, adjust each system, and load test.
The timing of diesel engine
overhaul should generally be determined according to the specific working hours
and technical conditions. The working hours of the same type of internal
combustion engine are different. For example, the first overhaul period of 4135
diesel engine is 6000 hours. This time is not inflexible, for example, due to
improper maintenance or poor working conditions of the internal combustion
engine (dusty, often overloaded, etc.). it may not be used until the working
hours are reached. Therefore, in determining the internal combustion engine
overhaul, in addition to working hours, but also according to the following
overhaul criteria.
1. Internal combustion engine
work powerless (after the load decreased speed, sound mutation), exhaust smoke.
2. Internal combustion engine is
difficult to start at room temperature. Crank bearing, connecting rod bearing
and piston pin are percussive after heating.
3. At normal temperature, the
cylinder pressure of the internal combustion engine is less than 70% of the
standard pressure.
4. Internal combustion engine
fuel and oil consumption increased significantly.
5. Misroundness and conical
degree of cylinder, clearance between piston and cylinder, misroundness of
crankshaft journal and connecting rod journal.
During the overhaul of the diesel
engine ,the main parts of the diesel generator should be repaired, and the
whole engine should be decompossed into assemblies, assemblies and parts, and
checked and classified, and thoroughly inspected according to the technical
conditions for repairs. Repair and reloading test.
How to do the cleaning work
before the disassembly of diesel generator sets
it is an important link to do the
maintenance work well in the process of maintenance of diesel generator set
internal combustion engine. Cleaning methods and cleaning quality have an
important impact on the accuracy, maintenance quality, maintenance cost and
service life of unit parts. Cleaning of diesel generator engine parts includes
oil removal, scale, carbon deposition, rust layer and old paint layer.
According to the material
quality, precision degree, dirt property and cleaning requirement of each
working procedure, different cleaning methods must be adopted to select
suitable equipment, tools, process and cleaning medium. In order to obtain good
cleaning effect.
Cleaning before disassembly
mainly refers to external cleaning before disassembly. The purpose of external
cleaning is to remove a large amount of dust, oil, sand and other dirt
accumulated outside the mechanical equipment, so as to disassemble and avoid bringing
dirt, sludge and the like into the repairing place. External cleaning is
generally done by tap water, that is, the tap water is connected to the
cleaning part by a hose, the oil is flushed with water, and the thick layer of
the scraper is used. High-pressure water scouring, that is, high-pressure water
flow with a pressure of 1 to 10 MPa is used for scouring. For thicker thick
layers of soil, an appropriate amount of chemical cleaning agent can be added
to increase the spray pressure and water temperature.
Common external cleaning
equipment are: single-gun jet cleaning machine, which is a flushing action by
a high-pressure continuous jet or a jet combined with the chemical action of
the cleaning agent to remove dirt; a multi-nozzle jet cleaning machine with
door frame moving and tunnel fixing There are two types, the nozzle
installation position and the number vary depending on the purpose of the
device.
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