Why Are Cylinders Leaking in Diesel Generator Set
by Starlight Generator dieselgeneratortechWhy
does diesel generator set cylinder leak air?
A.Oil
supply system failure.
a.Parking solenoid oil
inlet valve does not work.
b.There is little diesel
oil in the tank or the suction valve of the tank is not open. Fill diesel oil
according to the instructions and open the suction valve of the oil tank.
c.Fuel supply line or
diesel filter is blocked. Clean the oil pipeline and pipe joint strainer.
d.There is air in oil
supply system. Unscrew the exhaustion bolt on the diesel filter, press the
rocker arm of the oil transfer pump to repeatedly pump air several times, then
tighten the exhaustion bolt, and check whether the joints of oil pipes are
tightened.
e.Injection advance
angle is incorrect. At this time, tighten the fuel injection pump after
adjusting according to the specified data.
B.Cylinder
pressure is poor.
a.Air leakage in
cylinder head gasket. Fix torque according to the specified torque and
sequence, and tighten the cylinder head bolts in order. At the same time, check
whether the cylinder head gasket is damaged, otherwise it needs to be replaced.
b.Poor sealing of valve
and valve seat. Remove the carbon deposit between the valve and the valve seat,
grind the valve and the valve seat if necessary, or mill the valve seat ring.
c.Insufficient valve
spring force or the spring is broken. Otherwise, replace it.
d.Stuck air valve and
valve guide. Remove the valve guide and valve, clean them in kerosene, and
check the assembly clearance between them.
e.Deformation and
cracking of valve or valve clearance adjusting gasket tappet. Replace the tappet
and select the adjusting gasket with appropriate thickness.
f.Excessive wear of
cylinder liner and piston ring and insufficient elasticity of piston ring.
According to the repair process to replace or enlarge the piston ring, or
replace the standard cylinder liner and piston ring, which both must meet the
assembly technical requirements.
C.Preheating
device does not work properly.
a.Electric starter and
electric valve wiring plug socket loose or poor contact. At this time, check
whether the plug and socket are damaged, re plug or replace the plug and
socket. Otherwise, check the electric starter and electric valve.
b.One-way valve spring
in the connecting pipe of preheating oil circuit failure.
How
to judge the cylinder tightness of diesel generator?
a.Remove the fuel
injector from the engine block, and then inject a little oil into the cylinder
through the injection hole. Shake the flywheel after reassembly, if you feel
obvious compression, it means that the cylinder and piston are not well sealed.
b.Remove the piston
group for inspection, and replace the parts if necessary.
When it is difficult to
start the diesel engine due to the air leakage of cylinder and piston group,
this method can be used for emergency starting.
How
to improve the cylinder tightness of diesel generator?
a.The vacuum of diesel
generator set is good, the pressure of diesel is large, and the oil supply will
be more smooth. During cold start of diesel generator set in winter, because
there is little oil on piston ring and cylinder wall and the sealing effect is
not good, the phenomenon of repeated start and failure to fire operation will
occur.
b.In view of the
difficulty in starting the diesel generator set, the fuel injector can be
removed and 30-40ml oil can be added into each cylinder to enhance the sealing
performance of the cylinder and increase the pressure during compression.
c.Sometimes, the sealing
performance of the cylinder is seriously affected by the heavy wear of the
cylinder, which makes the start-up more difficult.
How
to reduce cylinder wear of diesel generator set?
a.Before starting the
unit, shake the crankshaft first to let the lubricating oil enter the surface
of the lubricating parts. After start up, first operate with low speed, after
temperature rise, increase load. Keep the generator set at normal temperature during
operation.
b.Clean the air filter
of diesel generator in time and check the capacity and quality of engine
oil frequently.
c.Guarantee the repair
quality and normal fit clearance of diesel generator set. In the process of
repair and assembly, the following should be done:
Cylinder center line is
perpendicular to crankshaft center line;
Crankshaft and
connecting rod must not be bent or twisted;
The piston pin,
connecting rod sleeve and connecting rod bush shall be installed correctly;
Ensure that the
crankshaft center line is perpendicular to the cylinder center line;
The cylinder shall have
certain precision and finish.
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Created on Dec 14th 2019 01:38. Viewed 196 times.