Weifang 495 - Inspection and Adjustment of Injector

time. the speed of .the camshaft should:not exceeds:'l~OOrp_~
f). Fixing the low speed stopscreW.l J
Keep the camshaft running at a speed of ,'250~3bOirpmt("2'75
rpm for example) Operate the governorcontrol·lever·;-torm~ike the
amount of.fuel delivery to each cylinder be of:2-3-ctn}!200
1
·fimes i.
e. to keep the engine running idly, then screw in the low speed stop
screw until it touches. the lower lug on the~governor·'co.nttolrshaft.
Set the governorc9ntrolleveron the iding ·limitposition·.,~afidi~r~aa
just the amount of fuel delivery 'until it reaches the specifie~' ~alfie
of the engine running idle, then tighten the lock nut.
D. Inspection and adjustment of Injector
a. Dismantle the inject9T and wash its parts in clean-·kerosene
or diesel fuel. The primary and secondly washes sh.ould be done in
different containers. The pa!t of the nozzle assembly should not be
confus'ed with that ,of other nozzle assembly and the dirt and car-
bon deposit.:on th'eir surfaces .sho,uldbescraped, ()£.£¥,<:'wi~h:. apiece of
wood or brass sheet, and then wiped cleaning Jiih"api~ce of soft
). '"
cloth.
b. a well cleaned needle valveshou'ld~eabre'''t6 slide down into
its nozzle body by its own gravity.Iftp~ c6lJ.iCcat~~4ting~urfaces of
'.,' - " ," .• :' _.' .*...... ... ;. - .,' ,":' - '- •. ~ "- - .'-
the needle valve and noz~lehody are not good enough to be oil-
tighted, the'y can be lapped each othe'r with a fine lapping com-
pound such as +I: 500 greenchroinium oxide paste. Both the needle
valve and the nozzle bo.dy must be washed cleaning thoroughly af-
ter lapping.
c. Install nozzle assembly onto injector and check injection
. ::: .,~ '" .
pressure as well as the spray pattern on an injector test benc~. Th~
Injection pressure should be set within 11768 + 980KP~, A go.od
nozzle
should be able to atomize the fuel finely without fuel
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