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the cylinders in which they are to
be installed. When the refinishing of
all cylinders that require it has been
PART 8-1-GENERAL ENGINE SERVICE
completed and all pistons fitted, thor-
oughly clean the entire block to re-
move all particles from the bearing
EJ
CLEANING AND INSPECTION
INTAKE MANIFOLD
CLEANING
Remove all gasket material from
the machined surfaces of the mani-
fold. Clean the manifold in a suitable
solvent, and dry it with compressed
air.
INSPECTION
Inspect the manifold for blocked
or restricted passages, cracks, sand
holes, improperly machined or dam-
aged surfaces, or breakage. Replace
the studs if they are stripped. Re-
place the manifold if it is damaged
beyond repair.
Remove all filings and foreign
matter that may have entered the
manifold as a result of repairs.
EXHAUST MANIFOLDS
CLEANING
Remove all gasket material from
the manifolds.
On the right exhaust manifold,
clean the
automatic choke heat
chamber (stove) . Make sure the air
inlet passage is completely open and
the cover does not leak. Blow out
the automatic choke air heat tube
and air inlet tube with compressed
air.
INSPECTION
Inspect the manifold for sand
holes, cracks, restricted passages and
improperly machined surfaces. Re-
place stripped or broken bolts and
studs.
VALVE ROCKER ARM
SHAFT ASSEMBLY
CLEANING
Clean all the parts thoroughly.
Make sure all oil passages are open.
If
necessary, remove the plugs from
both ends of the rocker arm shaft to
thoroughly clean the shaft passages.
INSPECTION
Check the clearance between each
rocker arm and the shaft by checking
the ID of the rocker arm bore and
the OD of the shaft.
If
the clear-
ance between any rocker arm and the
shaft exceeds the wear limit, replace
the shaft and/or the rocker arm. In-
spect the shaft and the rocker arm
bore for nicks, scratches, scores, or
scuffs.
Inspect the pad at the valve end
of the rocker arms for indications
of
scuffing or abnormal wear.
If
the
pad is grooved, replace the rocker
arm. Do not attempt to true this
surface by grinding.
Check for broken locating springs.
PUSH RODS
INSPECTION
Check the ends of the push rods
for nicks, grooves, roughness, or ex-
cessive wear.
The push rods can be visually
checked for straightness while they
are installed in the engine by rotat-
ing them with the valve closed.
They also can be checked with a
dial indicator (Fig. 13) .
CYLINDER HEADS
CLEANING
With the valves installed to pro-
tect the valve seats, remove deposits
from the combustion chambers and
valve heads with a scraper and a
wire brush. Be careful not to dam-
age the cylinder head gasket sur-
face. After the valves are removed,
clean the valve guide bores with
valve guide cleaning tool 6085-HI.
Use cleaning solvent to remove dirt,
grease, and other deposits.
Remove all deposits from the
valves with a fine wire brush or buff-
ing wheel.
INSPECTION
Check all water passages to make
certain they are open. Examine the
cylinder head for water leaks or
cracks in the exhaust or inlet ports,
or around the valve seats. Check the
cylinder head gasket surfaces for
burrs and nicks. Replace the head if
it is cracked.
Holding Fixture
FIG.
13-Push Rod
Runout
A1003-A
8-13
bores, oil passages, cylinder head bolt
holes, etc. Coat the cylinder walls·
with oil.
CD
@
CHECK DIAGONA-LLY
{i)
CHECK ACROSS CENTER
FIG.
14-Cylinder Head
Flatness
A1903-A
Cylinder Head Flatness. Check
the flatness of the cylinder head
gasket surface (Fig. 14).
Valve Seat Runout. Check the
valve seat runout with an accurate
gauge (Fig. 15). Follow the instruc-
tions of the gauge manufacturer. If
the runout exceeds the wear limit,
reface the valve and valve seat.
Valve Seat Width. Measure the
valve seat width with a valve seat
scale. Reface the valve seats if the
width is not within specifications.
Valve. The
critical
inspection
points and tolerances of the valves
are illustrated in Fig. 16.
Inspect the valve face and the
edge of the valve head for pits,
grooves, scores, or other defects.
Inspect the stem for a bent condition
and the end of the stem for grooves
or scores. Check the valve head for
signs of burning, erosion, warpage
and cracking. Defects, such as minor
pits, grooves, etc., may be removed.
Discard valves that are severely
damaged.
Inspect the valve springs, valve
spring retainers, locks and sleeves
for defects. Discard any visual1y de-
fective parts.
Valve Face Runout. The valve
face runout should not exceed the
wear limit specified in Part 8-3.
If
the runout exceeds the wear limit,
the valve should be replaced or re-
faced as outlined under "Refacing
Valves" in this section.
Valve Stem Clearance. Check
the valve stem to valve guide clear-
ance of each valve in its respective
valve guide with the tool shown in
Fig. 17 or its equivalent.
Install tool 6505-F on the valve
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