TROUBLESHOOTING
--
Piston ring stuck.
I
I
Piston ring worn.
Lubricant
rises
through piston
gap.
-I
1
~
Excessive
gap
between cylinder liner
and
piston.
Too much
oil.
~
Injection delayed.
r
I
..
Compression pressure insufficient.
r
l
Injection
too
early.
Injection mistimed.
J
1
I
I
~
Injection delayed.
Plunger does
not
return completely
because
..
Fuel pump's injecting capacity
spring
is
stuck or broken.
varies.
Plunger worn.
~
Needle valve stuck .
I
Nozzle does
not
inject fuel
..
Nozzle spring broken.
1
properly.
~
Too much carbon sticks
to
nozzle
tip.
Injection pressure
too
low.
__________________________________________
~~~-----c-o-m-p-r-es-s-ed--a-ir-l-ea_k_s_.
______________________
-1
Y
Not
enough air.
~
Excessive
gap
between piston
and
liner.
~
Piston ring stuck.
~
Piston ring worn.
..
Excessive
gap
between intake/exhaust valve
and
valve stem.
-
Valve stem
seal
broken.
-
Oil leaks
from
defective packings.
r
---
Injection pump plunger leaks much fuel.
Fuel
mixed
with
oil.
r----f
~I
Fuel pump
leaks
much fuel.
1
1
..
Head
gasket packing faulty.
Water mixed
with
oil.
r
1
I
I
..
Crankcase cracked .
Gear
oil mixed
with
oil.
Hydraulic pump's oil
seal
broken.
- 157
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