f） injector disgorges no or minor amount
of fuel, has low injection pressure, or
has bad atomization; the pressure
adjusting spring thereof is damaged;
injection hole is clogged or locked.
g） Delivery valve of injection pump is
leaked; the spring thereof is
damaged; the matching part for the
piston thereof is damaged.
injector, adjust the injection pressure; or
replace the injector assembly.
g） Replace the injection pump, spring or matching
part for the piston.
2. Cylinder pressure is insufficient.
a） Valve clearance is too small.
b） Air leaks from valve.
c） Air leaks from junction of cylinder
head and gasket.
d） Piston ring is worn, coked or the
openings are overlapped.
e） Abrasions of cylinder liner and piston
a） Adjust the valve clearance.
b） In case of reduced elasticity of the valve spring,
replace the spring; in case of bad sealing
performance of the taper surface, polish the
valve.
c） Replace the head gasket.
d） Remove the coking; replace the piston ring;
adjust the opening position of the piston ring.
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