INSPECTION - TM-9-2320-386-24-1-20655

TM 9-2320-386-24-1-2

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GENERAL MAINTENANCE PROCEDURES (Contd)

INSPECTION

a. General Instructions. Procedures for inspections will be the same for many parts and components

which make up the vehicle subassemblies. General procedures are detailed in steps b through q.

Dimensional standards for parts have been fixed at extremely close tolerances, so use specification tables.

Use specified inspection equipment for inspection where cracks and other damage cannot be spotted

visually. Exercise extreme care in all phases of inspection.

b. Castings.

(1) Inspect all ferrous and nonferrous castings for cracks using a magnifying glass and strong light.

(2) Refer to ASTM-E 1417, Inspection, Liquid Penetrant Methods, and MIL-I-6868, Inspection

Process, Magnetic Particles.

(3) Particularly inspect areas around studs, pipe plugs, threaded inserts, and sharp corners. Replace

all cracked castings.

(4) Inspect machined surfaces for nicks, burrs, or raised metal. Mark damaged areas for repair or

replacement.

(5) Inspect all pipe plugs, pipe plug openings, screws, and screw openings for damaged or stripped

threads. Replace or repair damaged or stripped threads.

(6) Using a straightedge or surface plate, check all gasket mating surfaces, flanges on housings, and

supports for warpage. Inspect mating flanges for discolorations which may indicate persistent

oil leakage. Replace damaged parts.

(7) Check all castings for conformance to applicable repair standards. Replace damaged castings.

c. Bearings. Refer to TM 9-214 for inspection of bearings. Check all bearings for conformance to

applicable repair standards.

d. Studs, Bolts, and Screws. Replace if threads are damaged, bent, or stripped.

e. Gears.

(1) Inspect all gears for cracks in strong light. No cracks are allowed.

(2) Inspect gear teeth for wear, sharp edges, burrs, and galled or pitted surfaces.

(3) Check keyway slots for wear and/or damage.

f. Oil Seals. Oil seals are mandatory replacement items.

g. Engine Bearings.

NOTE

Engine connecting rods and main bearings are serviced in sets. If

one bearing fails, all bearings must be replaced.

Old and new style engine components must be used as sets and

not intermixed.

h. Bushings and Bushing-Type Bearings.

(1) Check all bushings and bushing-type bearings for secure fit, evidence of overheating, wear,

burrs, nicks, and out-of-round condition.

(2) Check for dirt in lubrication holes or grooves. Holes and grooves must be clean and free from

damage.

Expansion Plugs. Inspect for leakage. Replace plugs when leakage is present.

Machined Tooled Parts. Inspect for cracks, breaks, elongated holes, wear, and chips.

k. Machined Surfaces. Inspect for cracks, evidence of wear, galled or pitted surface, burrs, nicks, and

scratches.

Mated Surfaces. Inspect for remains of old gasket, seal, secure fit, pitting, and evidence of leakage.

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