TM 10-4320-307-24
4-17
CRANKSHAFT ASSEMBLY REPLACE/REPAIR (CONT)
CLEANING:
Dry cleaning solvent Is potentially dangerous. Avoid repeated and prolonged
breathing of vapors and skin contact with the liquid. Do not use near open
flame, arcing equipment, or other Ignition source. Always wear eye protection
and protective clothing.
Death or serious Injury could occur if compressed air is directed against the
skin.
Do not use compressed air for cleaning or drying unless the pressure is/has
been reduced to 30 psi (2.11 kgcm2) or less. When working with compressed air
always use chip guards, eye protection, and other personal protective
equipment.
1.
Clean all parts of crankshaft assembly with dry cleaning solvent to remove all traces of grease and oil.
2.
Dry with compressed air.
3.
Clean gasket surface of cylinder block and rear cover.
INSPECTION:
1.
Inspect rear cover as follows:
a.
Inspect gasket surface for cracks, gouges, or other damage that would prevent proper seal between rear cover
and cylinder block Minor nicks or gouges may be repaired using crocus cloth. Replace cracked or badly damaged
cover.
b.
Inspect cover for warpage by placing it flange down on a flat surface. Replace cover if warped.
c.
Inspect shaft seal bore for gouges, wear, or other damage that would prevent proper seating of seal.
2.
Inspect crankshaft gear for cracks, excessive wear, chipped or broken teeth, corrosion, pitting, or other damage. If
gear is damaged or excessively worn, replace it.
3.
Inspect crankshaft for damage as follows:
a.
Visually inspect crankshaft journals and crankpins for overheating, cracking, excessive wear,or damage.
b.
Visually inspect crankshaft for cracks radiating at 450 to crankshaft axis from oil holes.
c.
Inspect for cracks at fillet areas.
d.
Inspect for minute cracks using MIL-1-6868 Magnetic Particle Inspection.
e.
Check front and rear oil seal areas using micrometer. The wear groove should not be more than 0.010 inch (0.25
mm) deep in diameter.
f.
Replace crankshaft if cracks, damage, or signs of overheating are found.
4-126
