Cummins Generator Set Parts Maintenance
by Starlight Generator dieselgeneratortech1. Connecting rod of
Cummins generator
A.If the copper sleeve
of connecting rod is excessively worn, connecting rod must be sent to the
repair shop with milling machine to replace it with a new copper sleeve
(Cummins repair service center). When replacing the new copper sleeve, the
piston pin and the new copper sleeve must be brought. The diameter of the
copper sleeve of the processed connecting rod is N (50). 825-50. 838mm), K
(60.985-61. 024mm). The difference between the diameter of piston pin and
copper sleeve is 0. 05mm.
B.The connecting rod
with connecting rod bush must be scrapped.
C.When assembling
connecting rod screws, it is necessary to carefully check whether the
connecting rod screws are elongated, cracked or damaged. Unqualified connecting
rod screws and nuts must be replaced.
D.If enlarge connecting
rod bush, it is recommended not to exceed two levels at most.
E.When installing the
connecting rod screw, it is necessary to check whether the connecting rod screw
slips twice according to the specifications. or the slipping connecting rod
screw, it must be replaced and the specified torque must be reached several
times.
F.When the connecting
rod and piston assembly are installed on the crankshaft journal, attention must
be paid to the installation of the connecting rod, otherwise serious accidents
of bearing burn will occur.
2. Cylinder block of
Cummins generator
A.The cylinder liner
must be maintained with qualified flatness. If the stop surface is uneven, the
cooling water of the cylinder body will flow out of the cylinder body from the
stop. Some cylinder bodies are equipped with liner washers. When pressing the
liner, the liner washers must be put into the stop.
B.When the main bearing
burns, the main bearing pedestal will be deformed, even cracks will occur. The
deformation of the main bearing pedestal can be sent to a professional repair
company for repair and recovery, while the cracked cylinder body will be
scrapped. For the cylinder block of high-power diesel engine, when installing
the cover screws on both sides, the length must be checked carefully.
Otherwise, the screw with too long length will easily collide with the balance
weight of crankshaft and damage the cylinder block and crankshaft.
C.During the overhaul of
the unit, it is necessary to clean the oil passage of the cylinder block and
keep the oil passage clean.
D.For the piston cooling nozzle installed in the cylinder block during the intermediate overhaul of the unit, it is recommended to install or remove the piston and connecting rod assembly after removal to prevent the piston and connecting rod assembly from breaking the piston cooling nozzle. After the piston and connecting rod components are installed, install the piston cooling nozzle.
E.When installing the
main bearing, pay attention to whether the installation of each main bearing is
correct. And check whether the bearing bush locating ring is missing. The main
bearing screws must be loosened after reaching the specified torque according
to the specification, check whether the main bearing cover screws have sliding
wire phenomenon. Replace the screws with sliding wire phenomenon and damaged
screw thread.
F.For burnt crankshaft,
after grinding, it is necessary to check the bending degree of crankshaft and
whether there is crack in the shaft stiffness. Do not use the cracked
crankshaft.
3. Follow-up arm
mechanism of Cummins generator set
There may be pockmarks
or peeling on the valve or injector roller to the follower arm. If so, the
roller, roller shaft and roller pin must be replaced, or the diesel engine
(driven by land generator set) will emit black smoke.
4.Oil pump of Cummins
generator set
During the mid overhaul
of the unit, the oil pump must be inspected. If the internal gear of the oil
pump is excessively worn, the unqualified parts must be replaced or replaced as
a whole.
5. Cummins generator set
water pump
When the unit is in
medium overhaul, the oil pump must be overhauled, and the water pump shall be
overhauled with the water pump overhaul package or the water pump minor repair
package. When installing the water seal, special installation tools must be
used for installation, otherwise it is easy to damage the water seal.
6. Cummins generator set
belt
When replacing the belt
of fan, water pump and charger, if there is more than one belt of the same type
for one machine, all the belts of the same type must be replaced.
7. Turbine Holset of Cummins
generator set
A.The impeller of
exhaust gas turbine shaft and compressor shall not be damaged, otherwise, the
air intake of diesel engine will be insufficient, and black smoke will be set
when the diesel engine is loaded.
B.In particular, when
the valve seat, valve and piston are damaged, the debris is discharged to the
impeller of the exhaust gas turbine shaft of the Holset turbocharger along with
the exhaust gas, and the impeller is damaged.
C.If the oil ring
installation groove of the exhaust gas turbine shaft is worn, the oil will leak
to the exhaust gas impeller end, resulting in a sharp increase in oil
consumption.
8. Intercooler of Cummins
generator set
A.During the overhaul of
Cummins diesel engine, the intercooler must be inspected and cleaned. If there
is rust and scale on the surface of the intercooler, it means that the
intercooler has water leakage fault, and the intercooler must be scrapped.
B.When cleaning the
intercooler, if the material of the intercooler is aluminum alloy sheet, it can
be cleaned with metal cleaner, Tianna water and diesel oil and dried; if the
material of the intercooler is other material (such as Cummins K Series), it
can only be cleaned with Tianna water and diesel oil. After cleaning, it must
be noted that it is moisture-proof and rusty, and it is absolutely forbidden to
use water to clean K series intercooler, Otherwise, the intercooler will be
rusted and scrapped.
Maybe above maintenance
regulations for Cummins diesel generator set is not completed, but we hope it
is helpful to you. Starlight manufacturer also supplies diesel gensets, welcome
to contact us by email sales@dieselgeneratortech.com
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Created on Jun 4th 2020 20:58. Viewed 430 times.