Operating instructions

6-10
SUBASSEMBLY
AND PART
INSPECT NATURE OF INSPECTION
SPECIAL
CONSIDERATIONS
CONNECTING ROD
ASSEMBLY
Bushing Inside Diameter Measure with telescoping
gauge and micrometer caliper.
New bushings must be
reamed within diameter
limits for new parts. Sharp
edges must be broken
slightly. (Refer to Table of
Limits, for wear limit, for
new bushing limits and new
bushing alignment limits).
CRANKSHAFT
ASSEMBLY
Crankshaft
Main Journals
Diameters, scoring, burning Must be polished before
magnetic inspection.
Crankpins Diameters, scoring, burning Must be polished before
magnetic inspection.
Oil Seal Race Scoring Must be polished
Screw Holes Damaged or dirty threads
Oil Holes Obstructions
Bending Measure run-out at center
journal and wobble on face of
flange.
Required only if shaft has
been subject to shock.
Gear Dowel Tight Fit Attempt to pull out by hand
only.
Oil Control Plug Presence Obstruction of oil hole, tight fit.
Gear Teeth, Screw,
Threads
Burning, scoring, wear enough
to alter profile. Damaged or
dirty threads.
CAMSHAFT ASSEMBLY
Camshaft Journals Diameter and fit in crankcase
bearings. Scoring, pitting and
corrosion.
Excessive bearing wear
may be compensated by
enlarging bearing and
installing oversize shaft.
Refer to “Crankcase”.
Lobes Pitting along toe line, loss of
slope along toe line, width
across heel and toe at center
of length.
Serious pitting not
permissible. Toe line must
taper in relation of axis to
rotate valve lifters.
Flange Screw Holes Distortion of threads.
End and Rear Face of
Flange
Nicks, peening, other
irregularities.
Must be smooth to align
gear.