Weifang 495 - Maintenance of Cooling System

I:hep'u:mp s;haft rotating inthe .. pu.rnp>,housing·is ~suPP(f)t-ted by
·,two d·t.1st'~proof,~rol1ing: b·earing:s.~.1'be·jm·pel1er is -installed.on the
;'re'-arend:·,of~·,thers·haft ·and·t.ighten.ed -'witha'nut. Inside -t.he'ne·ck-of
the impeller, a water seal and a '1later seal'gask'et are"~fitted--to~p~te
ve'nt:th~_wateI fr-om-l'eakage :b.y ,mea'ns of·th·e pressure'o£'>thewater
seal spring which pressesthegfasketonto the'e.nd. and makes the
gas~k.et 'ro-tatetogether .with the' s~ha£t.
In order to pre\Tent the water leaking f~om the water<seal'gas-
:~ket and~!enterin.g·the·ball'bearing_s· ,awate·r slinge·r is fitted in front
0'£· the-· bearing·s andas ma-ll;· w·ee·p ·holeis·-drilled.~a t the bottom' of ·the
bearing housing end te) drain off the. water go· into th-e bea.ring
.-h:o.us ing. ';'
Should the engil1e c' o.perated. in: N-orth China, the fan "can'be
provided with or V\rithout hub in constrLlction and both of them~a're
3~80·mm:.' in' ;diarlleter;- in;-South: Chin'a<.the "-Yue Jin
t
"
'type four-
.-blade· .hub-less fan· of 450.trlm india.meter"'·may be used:.
. )2). Maintenance of Cooling System
·(l)ln.'·order. to ,prevent the.:watecr jacket fro:m scale deposit ,the
cooling water should be the clean ,soft water. If ther'e is.no s~o£twa
ter, the·:hard·water .s'ho.u:ld be tr~atedill the manner recommended
in Chapter: '.5 .•
(2)The water temperature sho~Jd be maintained' within 80-
90°Cdu~in.g t.he. engine operating- Thee.~gine· is not allowed to run
continuously for a long period of time while the water temperature
is too high or too low.
(3)The scale deposit in;the cooling system should be removed
in the fourth order maintenance.- of the engine. According to the
following recommended .proccedures.:
a. Put either 750 _~. 800:grams of sodium., hydroxide (c~:ustic
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