Portable Compressor 7/20
14---4
SEPTEMBER 2003
Table 14---2.
(continued) ENGINE TROUBLESHOOTING
Fault
Remedy
Cause
Lack of fuel
Check the fuel tank and refill the fuel, if necessary
Also check the fuel system for air or leaks
Bad nozzle
If necessary, replace with a new nozzle
E
ngine suddenly
stops
Moving parts are overheated due to
shortage of lubrication oil or improper
lubrication
Check amount of engine oil with oil level gauge
Check lubricating oil system
At level 2 times of oil change, oil filter cartridge should be replaced
Check to see if the engine bearing clearances is within factory
specs
NOTE
When the engine has suddenly stopped, decompress the engine by the decomp and turn the engine lightly
by pulling on the fan belt. If the engine turns easily without abnormalities, the cause of the trouble is usually
lack of fuel or bad nozzle.
Fuel governing device bad
Contact dealer for repairs
Fuel is of extremely poor is quality
Select good quality fuel Use No. 2---D diesel fuel only
Color of exhaust is
Nozzle is bad
If necessary, replace with new nozzle
Color of exhaust is
especially bad
Combustion is incomplete
Cause is poor atomization, improper injection timing, etc.
Because of trouble in injection system or in poor valve adjustment
or compression leakage, poor compression, etc. Check for the
cause
Engine revolution suddenly decreases
or increases
Check the adjustments, injection timing and the fuel system
Unusual sound is heard suddenly
Check all moving parts carefully
Engine must be
Color of exhaust suddenly turns dark
Check the fuel injection system, especially the fuel injection
nozzle
Engine must be
stopped
i
di t l
Bearing parts are overheated
Check the lubricating system
pp
immediately
Oil lamp lights up during operation
Check lubricating system
Check, if the engine bearing clearances are within factory specs
Check the function of the relieve valve in the lubricating system
Check pressure switch
Check filter base gasket
Engine oil insufficient
Check oil level. Replenish oil as required
Fan belt broken or elongated
Check belt or adjust belt tension
Coolant insufficient
Replenish coolant
Excessive concentration of anti---freeze
Add water only or change to coolant with the specified mixing
radio
Radiator net or radiator fin clogged with
dust
Clean net or fin carefully
Engine overheats
Inside of radiator or coolant flow route
corroded
Clean or replace radiator and parts
g
Fan or radiator or radiator cap defective Replace defective part
Thermostat defective
Check thermostat and replace if necessary
Thermostat gauge or sensor defective
Check temperature with thermometer and replace if necessary
Overload running
Reduce load
Head gasket defective or water leakage Replace parts
Incorrect injection timing
Adjust to proper timing
Unsuitable fuel used
Use the specified fuel
