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1 -38
S. After all the
piston
and con-
neeling rod assemblies have been in-
stalled, check
the side
clearance
be-
tween
the
connecting
rods
on each
crankshaft
journal
(Fig. 44).
6. Install
the oil
pum
p
screen and
inlet tube, oil pan,
fl ywheel
housing
inspecl.ion
cover,
crankcase ventila-
tion
tube,
oil
level dip stick, and
the
cylinder head and related
parts.
Make
a preliminary valve
lash
adjustment.
Fill
and
bleed the cooling system and
fill
the
crankcase.
7.
Start the
engine and operate it
for
a
minimum
of 30
minutes
at ap-
proximately 1200 rpm. Check
the
valve
lash with
the engine
idli
ng
and
adjust
it
if
necessary. Make sure
there
is
sufficient
oil
pressure and the
engine does
not
overheat. Check for
oi
l
and coolant leaks.
Inslall
the valve
rocker arm
cover and the air cleaner.
GROUP 1- ENGINES
FIG.
44- Co nne
cting Rod
Side Cle arance
Il
MAIN AND CONNECTING ROD BEARING REPLACEMENT
The main
and
connecting
rod bear-
ing
inserts are selective
fit
and do
not
require reami
ng
to size
upon
installa-
tion.
Do
not
file
or lap
bearing
ClIpS
or
use
shi
ms to
obtain
the proper
bearing
clearance.
Selective fit bearings
are
available
for
service
in
standard sizes only.
Standard bearings are divided into
two
sizes
and
are
identified by
a
daub
of red or blue pai
nt.
Red marked
bearings increase the clearance;
blue
marked bearings
decrease the clear-
ance.
Undersize bearings,
which
are
not selecti
ve
fit,
are available for
use
on journals
that
have been refinished.
Normally,
main bearing journals
wear
evenly
and
are not out-of-round.
However,
if a
bearing is being fitted
to an out-of-round
journal,
be
sure
to fit the bearing
to
the maltimum
d
iameter
of
the
journal.
If the
bear-
ing is fitted
to the minimum
diameter
with minimum
clearance, interfer-
ence
may
result, causing an
early
fa il-
ure. It
is
not recommended that
bearings be fitted
to
a crankshaft
journal which
eltceeds
the
maximum
out-of-round
specification.
When
re-
placing
standard
bearings,
it
Is good
practice to
first
try 10
obtain
the
proper
cleara
nce
with
two
blue bear-
ing
halves.
Do not
get
dirt or
other foreign
mattcr
u nde
r
the inserts.
In
time the
dirt
m
ay distort
the bearing and cause
bearing
failure.
MAIN BEARING
REPLACEMENT
The
following procedure is for
the
engine installed
in
the chassis.
If
the
engine is on
a
work
stand,
omit
step
I, follow
steps 2-5.
In
step 4,
if
the
engine
is
on a work
stand,
it is
nol
necessary
to
support
the crankshaft
because
the
engi
ne
will be inverted.
Also
place the
Plastiguge
on
the
cra
nks
haft
journal
instead
of
o
n
the
bearing
surface (Fig.
45)
if the
engine
is
on a work
stand.
t.
Drain the
crankcase. Remove
the
distri
butor,
o
il
level dip
stick,
crankcase ventilation tube,
flywhee
l
housing
inspection cover, oil pan,
and
the
oil
pump.
PLACE PtASTIGAGE fULL WIOTH
OF
JOURNAL
ABOUT
~
INCH
CENTER
2. Replace one bearing
at
a lime,
leaving the
other
bearings securely
fastened. Remove
the main
bearing
cap
to
which new bearings are
to
be
fitted.
Insert
the upper bearing
re-
moval tool (1001
633 1)
in the
oil
hole
in the crankshaft.
Rotate
the
crank-
shaft
in the direction of engine rota-
tion
to force the bearing oul of the
block.
3.
To
install
the
upper main
bear-
ing,
place
the
plain
end
of the
bear-
ing over
the shaft
On
the
locking tang
side of
the
block.
Insert
tool
6331
in
the
oil
hole
in the crankshaft and
rotate the
crankshaft
in the
opposite
direction
of
engine
rotation until the
bearing seats itself. Remove
the 1001.
Replace the cap bearing. Clean the
crankshaft
journal
and bearings.
CHECK
WIDTH
OF
PtASTIGAGE
FIG.
45-ln stalling and Mea suring Plastigage-
Eng
ine
on Work Stand
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