160—ENGINE
CHRYSLER SERVICE MANUAL
d.
Disassembly
Refer
to
Figure
25 and
proceed
as
follows.
Pry
out plunger retainer spring clip. Clean varnish
deposits from inside
of
tappet body above
plunger
cap.
Invert tappet body
and
remove
plunger
cap,
plunger, flat check valve, check
valve spring, check valve retainer,
and
plunger
spring. Separate plunger, check valve retainer,
and check valve spring. Place
all
parts
in
their
respective place
in
tappet holder. Tool C-3068.
e. Cleaning
and
Assembly
Clean
all
tappet parts
in a
solvent that will
remove
all
varnish
and
carbon. Replace tappets
that
are
unfit
for
further service. Refer
to
Figure
25 and
assemble tappets,
as
shown.
f.
Inspection
If tappet
or
bore
in
cylinder block
is
scored,
scuffed,
or
show signs
of
sticking, ream bore
to next oversize, using Tool C-3028.
If
plunger
shows signs
of
scoring
or
wear
and
valve
is
pitted,
or if
valve seat
on end of
plunger
in-
dicates
any
condition that would prevent valve
from seating, install
a new
tappet assembly.
g. Testing
Use
a
clean container. Fill
the
container with
clean kerosene. Remove
cap
from plunger
and
completely submerge tappet
in an
upright
position.
Allow tappet
to
fill with kerosene, remove
tappet,
and
replace
cap.
Hold tappet
in an up-
right position
and
insert
the
lower
jaw of
pliers,
Tool C-3160,
in
groove
of
tappet body
(Fig.
26).
Engage
jaw of
pliers with
top of
tappet
plunger. Check leakdown
by
compressing pliers.
If plunger collapses almost instantly
as
pres-
sure
is
applied, disassemble tappet, clean
and
test again.
If
tappet still does
not
operate
sat-
isfactorily after cleaning, install
a new
tappet.
h. Installation
After work
has
been completed
on
tappet,
in-
stall tappet
and
push
rod in
their original
bores.
Position rocker
arm so it is
partially
seated
on
valve stem. Install valve spring
com-
pressor tool
and
compress valve spring until
rocker
arm can be
positioned over push
rod.
Remove tool
and
install tappet chamber cover.
51x971C
Fig.
26—Testing the Hydraulic Tappet (Typical)
Install intake manifold, carburetor
and
coil.
Connect items which were disconnected during
removal, refill cooling system, start engine,
and
warm
up to
normal operating temperature.
NOTE
To prevent damage
to
valve mechanism,
the
engine must
not be run
above fast idle until
all
of
hydraulic tappets have filled with
oil and
become quiet.
16.
CHECKING VALVE TIMING
Turn crankshaft until Number
1
intake valve
is closed. Insert
a .210
inch spacer between
rocker
arm and
stem
of
Number
1
intake valve.
(This
can be
done
by
prying between rocker
and valve spring seat with
a
large screwdriver).
Install
a
dial indicator
so
that pointer
con-
tacts valve spring seat
as
nearly
at a
right
angle
as
possible. Wait until seat stops moving.
This indicates that
oil has
bled
out of
hydraulic
tappet
and
plunger
has
bottomed, giving,
in
effect,
a
solid tappet.
Se,t dial indicator
on
zero
and
turn crank-
shaft clockwise (normal running direction)
un-
til dial indicator shows that valve
has
lifted
.021 inch.
The
timing
on the
vibration damper
should
now
read from
5
degrees Before
Top
Dead Center (BTDC)
to 7
degrees After
Top
Dead Center (ATDC).
Before making this check,
it is
well
to
check
the accuracy
of the Top
Dead Center
(TDC)
mark
on the
damper
by
bringing Number
1
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