Basic Engine
teeth. Replace the camshaft if this condition exists.
CRANKSHAFT
Cleaning
Handle the crankshaft with care to avoid possible
fractures or damage to the finished surfaces. Clean the
crankshaft with solvent, then blow out all oil passages with
FIG. 15 Checking Valve Spring Squareness
compressed air.
Inspection
Inspect the parts and discard the entire lifter
Inspection
assembly if any part shows pitting, scoring, galling or
Inspect the main and connecting rod journals for
evidence of nonrotation. Replace the entire assembly if
cracks, scratches, grooves or scores. Inspect the
the plunger is not free in the body. The plunger should
crankshaft oil seal surface for nicks, sharp edges or burrs
drop to the bottom of the body by its own weight when
that might damage the oil seal during installation or cause
assembled dry.
premature seal wear.
Assemble the lifter assembly and check for freeness
Measure the diameter of each journal in at least four
of operation by pressing down on the push rod cup. The
places to determine an out-of-round, taper or undersize
lifters can also be checked with a hydraulic tester to test
condition (Figure 16).
the leak-down rate. Follow the instructions of the test unit
Check the fit of the clutch pilot bushing in the bore of
manufacturer or the procedure in this manual.
the crankshaft. The bushing is pressed into the crankshaft
CRANKSHAFT VIBRATION DAMPER AND SLEEVE
and should not be loose. Inspect the inner surface of the
Cleaning
bushing for wear or a bell-mouth condition. Check the ID
Clean the oil seal contact surface on the crankshaft
of the bushing (Figure 17). Replace the bushing if it is
damper sleeve with solvent to remove any corrosion,
worn or damaged or the ID is not within specifications.
sludge or varnish deposits. Excess deposits that are not
Inspect the pilot bearing (ball bearing) when so
readily removed with solvent may be removed with crocus
equipped, for roughness. evidence of overheating or loss
cloth. Use crocus cloth to remove any sharp edges, burrs
of lubricant. Replace if any of these conditions are found.
or other imperfections which might damage the oil seal
during installation or cause premature seal wear. Do not
use crocus cloth to the extent that the seal surface
becomes polished. A finely polished surface may
produce poor sealing or cause premature seal wear.
Inspection
Inspect the crankshaft damper or sleeve oil seal
surface for nicks, sharp edges or burrs that might damage
the oil seal during installation or cause premature seal
wear.
TIMING CHAIN AND SPROCKETS
Cleaning
Clean all parts in solvent and dry them with
compressed air.
FIG 16 Crankshaft Journal Measurement
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 the components of the timing chain and sprocket
assembly, if any one item needs replacement.
CAMSHAFT
Cleaning and Inspection
Clean the camshaft in solvent and wipe it dry. Inspect
the camshaft lobes for scoring and signs of abnormal
wear.
Lobe wear characteristics may result in pitting in the
FIG 17 Checking Clutch Pilot Bushing Wear FLYWHEEL
general area of the lobe toe. This pitting is not detrimental
Inspection Inspect the flywheel for cracks, heat check, or
to the operation of the camshaft; therefore, the camshaft
other damage that would make it unfit for further service.
should not be replaced unless the lobe lift loss has
exceeded 0.005 inch.
Machine the friction surface of the flywheel if it is scored
The lift of the camshaft lobes can be checked with the
or worn. If It is necessary to remove more than 0.045 inch
camshaft installed in the engine or on centers. Refer to
of stock from the original thickness, replace the flywheel.
Camshaft Lobe Lift.
Check the distributor drive gear for broken or chipped
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