Weifang 495 - Page 71

whe.ther th-e pistons 1 COllrlectiIlg rods an,d malIl })eariIlg caps are
rrl~trke(! 'Nith numbers and wllether there ar~ chips ill the oils~n)p.
Check th.e relati\re positions of the piston ring gaps.
c. Before taking out the piston ,remove the carbon deposit~on
the upper portion of the liner bya scraper and.be,care ~1(/~, to dam-.
age,
th~ pi~ton and, piston ring.,
d. Thedisnlantl~,d bearing she~ls shotJld be reas.serrlbl~d In
time to pre~,en-t t'hem froIl1 <;onfusion ..
e. Before dismantling the piston pin ,the piston should be put
irlto lubricating oil and heated to lOO-129°C. ,
f. C·heck the, wear (;f these parts accordillg to the table of. tile
clearances and \Vea.f lirnits of t.he n1.ain parts~ If the clearar!ce has
..1 d h 1·· d hr·· l d- ~
nc;t eXCee(le ~ t e -w'ear llr.rllt an t, e s,urface IS In.gooa cO,n. Itlyn.,
the part Inay be used again;otller\vise ;it should be ~epaired or re·-
placed ..
B. Check the bearing clearance. If tht:re is no suitable checking
instl urrleIlt, t~le fol1c)vling met.ll()d rrtay be tal<ell:
a .. Rerrlove the beariIlg cap)l put a piece of fuse OIlto the
c;rankshaft journal.
b. RemOullt the bearirigca.p and tighterl the bOlts \vith tIle
specified torque'S
c. Dismantle t}1ebe<lriIlg cap agalrl. 1"ake out the deformed
fuse and Irieasure witt} a nl1crorl1eter its thickness villich is just e-
qual to the bearing clearance.
, (2 ) Repairing an(j Installi,llg C~rankshaft - ,Connecting Rod
Nlecllanism .
.LA,.. If the ovality of the crankshaft journal exceeds o. 06mm,
the crankshaft s110uld be reconditioned on a special grinding,ma-
chine. 1"he dimensions after every recondition are list in the follow-
36