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VOLVO
24663
Fig.
2-26.
Rep lac
in
g the
bush
in con necting rod
l
.
Drift SYO
1867
rod
bo
l"'s
w ~th
a
tor que
w rench,
see "Speci+iaatio ns"
for the cQlrrect tightening torque.
G
udgeon pins
The gudgeon pins me avail
a
hle in
ove rsize .05
mm
(.002")I,arger than the
standard
,diameter 22.00 mm
(.866"). If the gudgeon pin hole
in
t he p
iston
is
worn
so much that
,
a n oversize
is
necessmy, the hole
s
hould
first be
reamed
-out to the correct
mea'
s urement. Use
areamer fitted
with
{l
pilot
gu,ide
andon;ly take small
cu,
t s art a time.
The fit is correct when the gu'dge'on pin can be pushed
througrh
the
hole
by hand with light resist.ance.
CONNECTING RODS
Replacing the bushes
If
the old bush
in
a conneding rod
is
worn,
pre'
s s it
out by using
drift SVO
1867
and press
in
a
new
bush
with the
same
tool,
see Fig. 2-26.
Make
sure that the
lubricating heles index with
the
hol,
e s
in
~he
connect-
ing
rod.
Then ream the
bu'sh to
the
correot fit. The
gudgeon
pin
shou'ld
slrde
through the hole under light
thumb pressure burt without
,
a ny
noticeablelooseness.
Straightening
Before being
fi,
t ted, the
connecting ,red shoUlld
be
ched<ed for stmightness, twist
and any S-distorNon.
Straighten them
i,
f necessary. Nuts
and bolts
'shou,ld
be replaced wirth new
ones
when reconditioning is
being cnrried out.
CRANKSHAFT
Af ter the crankshaft has
been
cleaned, its journals
mu'
s t be measwed with
a micrometer.
Measuring
2 :
14
A
Fig.
2-27.
Bear ing journal
VOI.VO
22902
sh'Ou'ld
be carried out
a
t seve
m
l
poin:ts
round the
circumference a
nd along
t he
,longitudinal
axis of
e
a ch
joulf'n.aol.
Out-of-roun
dness on rthe main bearing journal
should n ot
excee
d .05 mm (.002"),
a
nd .07 mm (.003")
on the b
ig
-end beOlring
journals.
T aper shoul,d not
exceed .. 05 mm (.002") on any of th
e
jou'rnals.
If
,
t he
va,lues
'obtained are close to or exceed the wear
limit
mentioned above, the
cra,nkshaft
shoU'ld
be
gro'und to
undersize. Su,it.able bearing
'
s helh are avail-
ahle
in
five undersizes. The ,meaSUlrements concerned
are to be foundin the "Specifications".
Che'
c k
that
rthe crankshaft
is
skaight
to within .05
mm
(.Oå2") by
using
a diG! gauge. The crankshaft
is
pla,ced
on two V-bloaks and a dial gauge placed ag·a.inst the
centre
bearing journal
after
whi'
c h Ithe crankshaft
is
wrated.
If
necessary,
s,
t
ra,i,ghten
the
arankshaft
in
a
press.
Grind ing the crankshaft
Befo.re the
'
o ranrkshaft
is ground,
a
che,ck
should
be
made
to ensure
that i-t is straig.ht, this being done as
described previously.
Grinding
is
carri,ed out
in
a
spe,eial
machine whereby
the
main beoring journals
and the
bi,
g -end bearing journals are
ground
to iden-
tial measu-r8lments.
The'
s e
.measurememts, wh ich
me
given im "S
peciiiica,
t i'Ons", must be
carefuHy
followe,d
in
order
to ensure correat clearance with ready-
machined beming
she,
l ls.
On
no account must the bearing shel,ls be
shaved
or
the
bea1
ring
caps
tiried.
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