the engine shall exhaust black smoke, lower power and speed, raise exhaust temperature or knock
the cylinder. To check the trouble injector, loosen injection pipes one by one, stop injection, and
inspect the color of exhaust smoke. Only the trouble injector stop injection can make the engine
no smoke, crank the crankshaft slowly to check injection sound of each injector, the trouble
injector shall be no sound injection.
I nje ct or a d jus t me nt:
Set injector on testing machine; slowly increase pressure to pressure required in main
technical specification table. Check to ensure no fuel drops or leakage, otherwise clean or lap the
nozzle and try again.
Then check atomization at a speed of one injection per second. Atomized injection should be
smooth and fog shape without split, drops, uneven or partial injection but with obvious and
melodious sound when fuel supply is cut off. Generally speaking, an abnormal injection is caused
by unsmooth movement of plunger and barrel. While fuel drops in injection hole is caused by
damaged sealing surface, and uneven injection is caused by heat deflection due to carbon deposit
on head.
Injector dismounting:
When dismounting injector, firstly clean outside surface. Clamp it on bench vice with nozzle
toward upside. Note that the vice mouth should be covered with copper plates. Screw out the
tightening nut, pull out plunger and barrel and put in clean diesel. Turn the injector upside down
and clamp again. Screw out pressure adjusting screw and nut, then take out pressure adjusting
spring and push rod. Clean the plunger and barrel when they are seized or effect poor atomization.
Sink it in diesel for a while when seized, clamp it with cloth covered clipper and lightly turn out
the plunger. To clean plunger and barrel, scrap with wooden sheet dip in gasoline or diesel, metal
sheet is strictly prohibited. If plunger can't move smoothly in barrel, lap it with clean diesel, then
clean to remove all dirty and metal chips.
Speed adjustor:
Speed adjustor is well adjusted and lead sealed when ex-works. Don't adjust it unless necessary.
Adjust speed controller only on pump testing bench to prevent damaging.
8 . L UB RI CA TI ON S YS TE M
Lubrication system which effect pressure and splash lubrication consists of oil pump, oil filter
and oil channel.
Oil pump is of rotor type and is driven by camshaft gear. The gear shaft and camshaft gear are
lubricated by splashed oil. Oil filter is of paper cartridge type, which should have a good sealing.
While installing the cartridge, care must be taken to prevent leakage or short-way. The system
working pressure is 200-400kpa.
To ensure a longer service life, maintain the lubrication system completely and in time.
9 . C OO LI NG S Y ST EM
Cooling system is of closed, forced water-cooled, which consists of water pump, thermostat, fan,
connecting pipe and radiator etc.
The cooling water in radiator is pumped into cylinder block water cavity, then to cylinder head.
Some water directly flows up to cylinder head and accumulated near thermostat. Some water holes
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