Yangdong Co. Y90 Series Manuel de service télécharger pdf (Page 24)

OPERATION&MAINTENANCE MANUAL

abnormal or parts are damaged, the diesel engine might have errors during operations

such as block smoke, power and rotation speed decreases, temperature discharge too

high or impact on the cylinder, etc. The judgment on oil injector with errors can adopt

stop-in-turn method, i.e. loosen the connection nuts between oil injector and high

presser oil pipe one by one to stop oil injection, and meanwhile observe the color of

smoke exhaust. If there is any oil injector with faults, stop the oil injection and no smoke

will be discharged; rotation speed changes little or without any change. It is also

feasible to rotate the flywheel one by one to listen to the oil injection sound, when clear

sound is lost; it means the oil injector in this cylinder might have errors on it.

1. Adjustment of the oil injector

(1) Handle the pump to the gauge pressure close to the oil injection pressure,

and keep slowly pressing the handle pump to increase the surface pressure to

regulated oil injection pressure. Observe the oil injection hole, where should not have

oil drop or leakage. If after several times of test, there is still oil drop, dismantle the

injection nozzle parts to clean, check or grind before carrying out the test.

(2) Adjust the oil injection pressure to regulated the pressure, and dismantle

the pressure adjusting nut, loosen or fasten this nut , make the oil injection pressure

accord to the regulated oil injection pressure, then fasten the nut and try again.

(3) Observe the spraying quality. Carry out pulverization test in the

once/second oil injection speed. The oil shall be even fog without any visible splashed

oil foam, partially uneven thickness or single side injection abnormal, etc .Clear sound

shall be occur when cutting off the fuel. In general , abnormal oil injection occurs

caused by the inflexible movement of injection nozzle needle valve. The drop of oil on

the injection hole usually occurs because of damage on the sealed surface, and the oil

separation from the carbon accumulation on the nozzle or hears deformation.

1. Dismantle and repair of oil injection

(1) When dismantle the oil injection, clean the external part to make the nozzle

face upward and clamp it to the table pliers with bronze pad. Screw down the nut

to take out the needle valve parts and pull out the needle valve to soak into clean

diesel. Turn the oil injector for 1800 and clamp. Take down the pressure

adjusting nuts and screw to take out pressure adjusting spring and top rod.

(2) If the needle valve parts are snapped or the pulverization is not good, clean it

right away. If the needle valve parts are snapped, soak them in diesel for some time,

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Yangdong Co. Y90 Series Manuel de service Page 24