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INSPECT
ENGINE OVERHAUL AND REBUILD
CYLINDER BLOCK
&
RELATED PARTS·
CLEAN
&
INSPECT
INSPECT
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Cylinder block and related parts inspection.
BLOCK
• Check upper cylinder block for warpage. If over
.002", the block must be replaced.
• Check for cracks and irregularities
in and
around all openings, bolt holes and on surfaces.
CAUTION
A warped block could be caused by a cooling
system
malfunction.
Check thoroughly
(See
Section E, Cooling System).
CRANKSHAFT
• Check for: Evidence of overheating. If found,
replace crankshaft since the heat treatment has
been destroyed.
Check for: Scoring of bearing journals.
Check: Oil seal contact surface for roughness or
grooving.
NOTE: Any imperfections of the oil seal contact
surface will result in oil leakage at this
point. Slight ridges on the oil seal contact
area may be cleaned up with emery cloth
and crocus cloth. If the grooves are too
deep, the crankshaft must be replaced.
• Inspect for wear of thrust washer surface area.
• Measure all journals - see specifications
in
General Section.
NOTE: Slight
surface
imperfection
can be
"cleaned up" by using crocus cloth on the
journals.
See "General
Section"
for
crankshaft recond iti oni ng.
MAIN
AND CONNECTING ROD BEARINGS
If these are to be reused, check as follows:
B3-17
• Inspect for excessive grooving, wear through
aluminum tin coating, and foreign
material
embedded in bearing surfaces.
• Inspect the backs of the bearing shells for
bright spots which indicate they have been
moving in the bearing caps or bearing supports.
If spots are present, discard bearings.
NOTE: Bearing failure may be the result of oil
deterioration
(acid
formation),
oil
contamination,
loss of oil pressure or
insufficient oil level. An oil analysis may
be required to determine actual cause of
the failure.
CAUTION
Always
discard
beari ngs if oi I has been
contaminated
with
antifreeze
or metallic
particles
from
internal
engine
component
failure. Always use lubricating oils that meet the
recommended specifications and viscosity. See
Maintenance and Lubrication Section of this
manual or the Vehicle Owner's Manual.
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Table of Contents
Troubleshooting
