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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 h r · ·
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
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