TROUBLESHOOTING
4-2.2 Causes and Troubleshooting for Deficient Power of
Diesel Engine
Table 6
Malfunction of fuel system
Parts obstruction in fuel filter and fuel
pipe
Inadequate fuel supplying
Check the fuel switch, they should be
opened fully.
Check the fuel filter and fuel pipe.
Bad pressing of fuel pump
Check or change the damaged parts of
the fuel pump.
Malfunction of the fuel nozzle
Incorrect injection pressure
Adjust the injection pressure.
Carbon deposit in the nozzle hole
Loose fit between needle and needle
body
Obstruction in air filter
Remove, clean or change the filter
core.
Not fast enough of engine speed
Check the speed of the engine with the
tachometer and then readjust the speed
limit bolts.
4-2.2.1 Instructions for speed adjustment
There are three bolts used in the speed limit system: left (C), middle bottom and
right (A) screws. Screws A & C are used for tightening metal plate B, A is also
used for fine adjustment of speed and middle bottom screw for setting
maximum fuel throttle. Please note that there is an oval-shaped hole in the
metal plate B with A through.
Screw A is used for fine adjusting RPM (Frequency < 5 Hz), moving B up
decreases RPM while moving B down increases RPM.
There are two rows of three small holes right behind the metal plate B and four
large holes in location E. If the adjusted frequency > 10 Hz, the thick spring D is
used for coarse tuning. Try to hook two ends of D in one of six small and four large
holes E respectively for obtaining desired frequency, e.g., if we need change
60Hz to 50Hz, this method will be involved. Given position of hooked small hole,
the obtained frequency decreases in the order from left to right holes of E;
given position of hooked large hole, the obtained frequency decreases in
the order from left to right small hole in the same row and upper to lower
small holes. Frequency adjustment shall be conducted with a frequency
meter.
Bolt F is preset for maximum power output position by manufacturer, it NEVER
touches fuel lever unless the maximum power output is reached. So, NEVER
adjust the position of threaded bolt.
CAUTION: If your generator runs unstable, e.g., runs at upper or lower, speed
and you excludes fuel system problem, you must try hooking the two ends of
coarse spring D in different small and large holes to find gut flexibly balanced
position.
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