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PART
8-1-GENERAL ENGINE SERVICE
8-17
Follow the same procedure to
check new valve springs before in-
stallation.
Make certain the proper spriag
(color coded) is installed.
HYDRAULIC VALVE LlmRS
The valve lifter assemblies !ihould
be kept in proper sequence so that
they can be installea in their original
position. Inspect and test each lifter
separately so as not to intermix the
internal parts. If aoy part of the 6ft.
er assembly needs replacing, replace
the entire assembly.
CLEANING
Thoroughly clean all the parts in
FIG. 26 -Typical Valve Stem
Clearance
clean solvent and wipe them with a
clean, lint-free cloth.
INSPECTION
Inspect the parts
.
and discard the
entire lifter assembly if any part
shows pitting, scoring, galling or
evidence of non-rotation. Replace
the entire assembly if the plunger is
not free in the body. The plunger
should drop to the bottom of the
body by its own weight when
assembled dry.
APPLY TORQUE UNTIL CLICK
IS HEARD. READ
Torque
Wrench
AND MULTIPLY
READING BY
TWO
12).
SET KNOB TO
COMPRESSED
LENGTH
OF SPRING
FIG. 27 -Valve Spring Pressure
Assemble the lifter assembly and
check for freeness of operation by
pressing down on the push rod cup.
The lifters can also be checked with
a hydraulic tester to test the leak
down rate. Follow the instructions
of the test unit manufacturer or the
procedure in Section
1.
TIMING CHAIN AND
SPROCKETS
CLEANING
Clean all parts in solvent and dry
them with compressed air.
Lubricate the timing chain with
engine oil before installing it on the
engine.
INSPECTION
Inspect the chain for
broken,
links.
Inspect the sprockets for cracks and
worn or damaged teeth. Replace all
components of the timing chain and
sprocket assembly if any one item
needs replacement.
On a V -8 Engine, inspect the fuel
pump drive eccentric for scores,
nicks or excessive wear. If the
eccentric is scored, replace it.
CAMS HAn
CLEANING AND INSPECTION
Clean the camshaft in solvent and
wipe it
dry.
Inspect the camshaft
lobes for scoring and signs of ab-
normal wear. Lobe wear character-
istics may result in pitting in the
general area of the lobe toe. This
pitting is not detrimental to the
operation of the camshaft; there-
fore, the camshaft should not be
replaced until the lobe lift loss has
exceeded 0.005 inch.
FIG. 28 -Valve Spring
Squareness
The lift of the camshaft lobes can
be checked with the camshaft in-
stalled in the engine or on centers.
Refer to Camshaft Lobe Lift.
Check the distributor drive gear
for broken or chipped teeth.
CRANKSHAn VIBRATION
DAMPER AND SLEEVE
CLEANING
Clean the oil seal contact sur-
face on the crankshaft damper with
solvent to remove any corrosion,
sludge or varnish deposits. Excess
deposits that are not readily removed
with solvent may be removed with
crocus cloth. Use crocus cloth to
remove any sharp edges, burrs or
other imperfections which might
damage the oil seal durmg instal-
lation or cause premature seal wear.
Do not use crocus cloth to the
extent that the seal surface be-
comes polished. A finely polished
surface may produce poor seal-
ing or cause premature seal
wear.
INSPECTION
Inspect the crankshaft damper
oil seal surface for nicks, sharp
edges or burrs that might damage
the oil seal during
installation
or
cause premature seal
wear.
CRANKSHAn
CLEANING
Handle the crankshaft with care
to avoid possible fractures or dam-
age to the finished surfaces. Clean
the crankshaft with solvent, then
blow out all oil passages with com-
pressed air.
INSPECTION
Inspect main and connecting rod
journals for cracks, scratches,
grooves or scores.
Measure the diameter of each
journal in at least four places to de-
termine out-of-round. taoer or un-
dersize condition (Fig. 29).
On engines used with a manual-
shift transmission, check the fit of
the clutch pilot bearing
in
the bore
of the
crankshaft.
The bearing
is
I
I
A VS B
=
VERTICAL TAPER
C
VS
D
=
HORIZONTAL TAPER
A
VS
C
AND
B
VS
D
=
OUT-OF-ROUND
CHECK FOR OUT-OF.ROUND AT
EACH END OF JOURNAL
'
\
'
','J~~---------~~
___
,
FIG. 29 -Crankshaft Jownal
Measurements
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