Weifang 495 - Maintenance of the Supply System; Maintenance of Air Cleaner

1--- Leak off pipe connection; 2---- Protecting cap; 3- Adjusting . screw ;
4-,'- Injector spring; 5----- Spindle; 6----· Nozzle; 7---- Cooper washer; 8- Nozzle cap
nut; 9---- Nozzle holder .
. Model ZS4S1 nozzle is of single -1101e pintle type (The. spray
hole diameter is 1 mm, cind the spray allg1e is 4
0
). The high pres-
sure fuel delivered by tl1e injection pump enters through the moz-
zle, holder and. the annular chamber in the nozzle body. When the
fuel pressure reaches to 11768KPa, the spring pressure.will be
overcom~d and the needle valve ~rill be lifted. At this time, a cer-
tain amount of fuel will be atomized and injected into the combus-
tion chamber through the spray hole. Aft~r·iniection, the fuel pres-
sure d.rops and the spray pole isplu_gged"· again by the needle valve
under the action of the_spring-Tete fuel leaking out from the clear-
ance between the needle valve and nozzle· body will return to the
flIel tank through the topo·ftheOiIljector ,the banjo connection bolt
and the leak off pipe.
The injector assembly is fixed on the cylinder head with two
stllds. The tv\ro nuts should be tightened evenly with specified
torque of IS-ZON-n. In order to ensure its air tightness ,a copper
washer is used on the bottom of the nozzle cap nut.
2). Maintenance of the Supply System
(1 )'Maintenance of Air C.Ieaner
A. When the engine operates In the atmosphe~e full. of
strawchips and dusts ,3 linen hood should be used to cover the in-
let port of the -air cleaner. The dust remained on the linen hood a:nd
the cleanetsho·uld be clea'ned off after every shift.
B. Check frequ·ently the air tightness of e\7ery air passage con-
nection. It is forbidden to operate the engine unless all the connec~
;.tions are well air - tight; otherwise, the cylinder liners will be worn
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