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PART 8·2-,
200, 250
C.I.D. SIX CYLINDER ENGINES
8-33
screwdriver.
Remove the check
valve
and
spring.
CLEANING
AND INSPECI'ION
Refer to page 8-17 for the cleaning
and inspection procedures.
ASSEMBLY
A
typical
hydraulic valve lifter
assembly
is shown in Fig. 30.
LIFTER ASSEMBLY-6500
FIG. 30-
Typical Valve
Lifter Assembly
1.
Place the plunger upside down
on a clean work bench.
2. Place the check valve in
posi-
tion
over the oil hole on the bottom
of
the
plunger.
Set the check
valve
spring on top of the check
valve.
3.
Position the check valve retain-
er over the check
valve
and
spring
and push the retainer down into
place on the plunger.
4.
Place the plunger
spring
and
then
the plunger (open end up) into
the tappet
body.
S.
Place the push rod
seat
in
the
plunger.
6.
Depress
the plunger and posi-
tion
the closed end of the lock ring
in
the
lifter body
groove.
Release the
plunger;
then depress it again
to
fully
seat the lock ring.
CLEANING
AND INSPECTION
Refer
to page
8~18
for the cleaning
and inspection procedures.
MAIN AND CONNECTING
ROD BEARING
REPLACEM~NT
The main
bearing inserts
are
selective
fit. Do
not file or lap
bearing
caps
or use bearing shims
tO obtain the proper bearing clear-
ance.
Selective
fit main bearings are
available
for service in standard
sizes and
0.002
inch
undersize.
Standard bearings are divided into
two sizes and are identified by a
daub of red or blue paint. Refer to
the Parts Catalog for the available
sizes. Red marked bearings increase
the clearance; blue marked bearings
decrease the clearance. Undersize
bearings, which are not selective fit,
are available for use on
journals
that have been refinished.
MAIN BEARING
1. Drain the
crankcase.
Remove
the oil leyel
dipstick.
Remove the oil
pan
and
related parts.
2. Remove the oil pump inlet
tube
assembly
and the oil
pump.
3. Replace one bearing at a time,
leaving the other bearings securely
fastened
.
Remove the main bearing
cap to which new bearings
are
to be
installed.
4.
Insert the upper bearing re-
moval tool in the oil hole in the
crankshaft.
S. Rotate the crankshaft in the di-
rection of engine rotation to force
the bearing out of the
block.
6. Clean the crankshaft journal.
When replacing standard bearings
with new bearings, it is good prac-
tice to first try to obtain the proper
clearance with two blue bearing
halves.
7.
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 and partially
install the bearing so that the tool
can be
inserted
in the oil hole in
the crankshaft. With the tool posi-
tioned in the oil hole in the crank-
shaft, rotate the crankshaft in the
opposite direction of engine rotation
until the bearing seats itself. Remove
the tool.
8. Install the cap bearing.
9. Support the crankshaft
so
that
its
weight will not
compress the
Plastigage used
in
Step
10
and
pro-
vide
an
erroneous
reading. Position
a
jack
so that it will bear
against
the
counterweight
adjoining
the bearing
which is being
checked.
10. Place
a
piece of Plastigage
on
the bearing
surface the
full width
of
the bearing cap
and about
1
/.!
inch
off center
(Fig.
31).
11. Install the cap and torque the
bolts to specifications. Do not turn
the crankshaft while the Plastigage
is in place.
12. Remove the
cap.
Using
the
Plastigage
scale,
check the
width of
the Plastigage. When checking the
PLACE Plastigage
FULL
WIDTH OF JOURNAL
ABOUT
Y4
INCH OFF
CENTER
--~-
CHECK WIDTH OF
Plastigage
ll'
M'ASO.,NG
0.0015"
CLEARANCE
INSTALLING
Plastigage
Plastig
age
FIG. 31
-Installing and
Measuring Plastigage-
Engine Installed
width of the Plastigage, check at the
widest point in order to get the mini-
mum clearance.
Check
at the nar-
rowest point in order to get the max-
imum clearance. The difference be-
tween the two readings is the taper.
13. If the clearance
is less
than
the
specified
limits,
try
two
red
bear-
ing halves
or a combination of red
and blue,
depending
upon the
condi-
tion
.
If the clearance
exceeds specified
limits,
try
0.002
inch
undersize
bearings
in combination with blue
or
red bearings.
The b<'aring clear-
ance must be within
specified
limits.
If 0.002 inch undersize main bear-
ings are used on more than one
journal, be sure they are all installed
on the same side (cap or cylinder
block)
of the crankshaft.
If the standard and 0.002 inch
undersize bearings
do
not
bring
the
clearance
within
the
desired
limits,
refinish
the
crankshaft
journal; then
install undersize bearings.
14. If the
rear
main bearing
is re-
placed, replace the
lower
oil
seal in
the
rear
main
bearing cap
as
follows:
Remove
and discard the rear
seal.
If there
is evidence of oil seal
leak-
age, the upper
half
of
the
oil seal
must
also
be
replaced to assure sat-
isfactory sealing.
Clean the mating
surfaces of
the
block
and rear
main
bearing cap,
and
the rear journal
oil seal
groove.
Preform the
new seal
by hand to
the
approximate radius
of the cap.
Insert
the seal in the oil seal
groove, seating
the
center
of
the seal
first
with
the
seal extending
equally
on both
ends.
Press
the seal down
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