Operating instructions

6-11
SUBASSEMBLY
AND PART
INSPECT NATURE OF INSPECTION
SPECIAL
CONSIDERATIONS
Gear Teeth Scoring, burning, pitting, wear
enough to alter profile.
CRANKCASE
ASSEMBLY
Crankcase Castings Valve Lifter Guides Diameter, scoring.
Bearing Seats Roughness, wear in tang
notches.
Refer to Table of Limits.
Camshaft Bearings Diameter, scoring, fit of rear
bearing between camshaft
flanges.
See paragraph 6-16.
Oil Passages Inspect visually, galleries,
main and camshaft bearing
supply holes, using inspector’s
flashlight to illuminate. Probe
other oil holes with brass rod.
Tapped Holes Deformed or dirty threads.
Studs Threads Distortion.
Height Check for backing outs. Refer to Stud Height Table.
Squareness Use toolmaker’s square to
check studs suspected of
bending.
Refer to Stud Height Table.
Idler Gear
Support and
Bushings
Bore Inside diameter, scoring. Refer to Table of Limits.
Needle Bearing Rollers Roughness or excessive play.
Retainer Mounting Surface
Oil Seal
Warpage, cracks. Observe
that old seal has been
removed without damage to
retainer.
Oil Filler Neck Tightness Attempt to rock and pull out by
hand only.
Must be tight in casting
Permold crankcase only.
Oil Gauge Rod Distortion Look for bent blade,
obliterated “FULL” and “LOW
marks, loose collar, deformed
cap.
Oil Gauge Support Tightness Attempt to move tube by hand
only.
Sandcast crankcase only.
Engine Mounting
Brackets
Machined Surfaces Warpage and scratches. Sandcast crankcase only.
All Areas Cracks Sandcast crankcase only.