63
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.
