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Carbon stuck
around orifice of
nozzle piece
Compression is
insufficient
leaking valves
Overheating of
moving parts
Valve out of
adjustment
Air cleaner is
dirty
Fuel injection
pressure is
wrong
Injection pump
wear
* Clean orifice and needle valve,
being very careful not to
damage the nozzle orifice.
* Check nozzle.
If defective, replace with new parts
* Band valve and excessive wear
of rings, pistons and liners
cause insufficient compres-
sion. Replace with new parts.
* Grind valves.
* Check lube oil system.
* Check to see if lube oil filter is
working properly.
* Filter screens or elements
deposited with impurities
would cause poor lubrication
clean screens.
* Check to see if bearing clear-
ance are within factory specs.
* Check engine timing.
* Adjusting timing (before top
dead center) 7° (0.122 rad.)
* Adjust to proper valve clear-
ance of inlet 0.2 mm (0.0079
in.), exhaust 0.45 mm (0.0177
in.) with engine cold.
* Clean the element every 100-
200 hours of operation.
* Adjust to proper pressure
* Do not use poor quality fuel for
it will cause wear of the pump.
Only use diesel fuel.
* Check the fuel injection pump
element and delivery valve
assembly and replace as
necessary.
Cause Countermeasures
When Output is Insufficient
code
KB
KS
Holder
2645A308
2645A316
Nozzle
2645A624
2645A637
Kgf/cm
2
310
304
MPa
30.4
29.8
When Color of Exhaust is Specially bad
See your KIOTI dealer.
When Color of Exhaust is Specially bad
Fuel governing
device is bad
Fuel is of
extremely
poorquality
Nozzle is bad
Combustion is
incomplete
* Contact dealer for repairs.
* Select good quality fuel oil.
diesel only.
* If necessary, replace with
new nozzle.
* Cause is poor atomization,
improper injection timing,
etc. because of trouble in
injection system or in
incorrect valve adjustment,
or compression leakage,
poor compression, etc.
Check for the cause and
repair.
Cause Countermeasures
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