18—ENGINE
CHRYSLER SERVICE MANUAL
PLUNGER RETAINING SPRING CLIP
PLUNGER
CAP
TAPPET PLUNGER
FLAT
VALVE
CLEAN
KEROSENE
VALVE SPRING-
VALVE RETAINER-
PLUNGER SPRING'
TAPPET BODY
52x389B
Fig.
23—Hydraulic Tappet (Disassembled Vieyv)
of tool for leverage, compress valve springs
suf-
ficiently
to
raise rocker
arm
above push
rod.
While holding rocker arm
in
this position, slide
rocker arm
to
one side along the tube.
NOTE:
To
avoid damage
to
valves,
be
sure that
piston head
is
well below
top of
travel before
compressing valve springs.
Remove intake manifold, carburetor and coil
as
an
assembly. Remove tappet chamber cover
and gasket. Lift tappet
out of
bore.
If all
tap-
pets
are to be
removed, remove hydraulic
tap-
pets and place them
in
their respective holes
in
tappet
and
push
rod
holder, Tool C-3068. This
will insure installation
of
tappets
in
their orig-
inal locations.
NOTE:
Do not
disassemble
a
tappet
on a
dirty
work bench. The plunger and tappet bodies
are
not interchangeable.
The
plunger
and
valve
must always
be
fitted
to the
original body.
It is
advisable
to
work
on one
tappet
at a
time
to
avoid mixing parts. Mixed parts are
not
usable.
d. Disassembly (Fig.
23)
Pry
out
plunger retainer spring clip. Clean
varnish deposits from inside
of
tappet body
above plunger cap. Invert tappet body
and re-
move 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
51x481C
Fig.
24—Tappet Immersed in Clean Kerosene
in their respective place
in
tappet holder, Tool
C-3068.
e. Cleaning
and
Assembly
Clean
all
tappet parts
in a
solvent that will
re-
move
all
varnish
and
carbon. Replace tappets
that are unfit for further service. Assemble tap-
pets,
as
shown
in
Figure 24.
i Inspection
If tappet
or
bore
in
cylinder block
is
scored,
scuffed,
or
shows signs
of
sticking, ream bore
to next oversize, using Tool C-3028.
If
plunger
shows signs
of
scoring
or
wear ajnd 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 posi-
tion.
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.
25).
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.
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