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TM 55-4920-405-13&P
Table 3-2. Intermediate Inspection Requirements
Requirements
Period
Item
Check general appearance of test stand, paying particular attention
50 hr
General
to cleanliness. perform services listed in table 3-1.
Check for missing or damaged lubrication fittings and for indications
50 hr
Lubrication fittings
of improper lubrication. Lubricate according to table 3-5. Replace
missing or damaged fittings. Correct all oil or grease leaks.
Inspect oil level in engine crankcase. Check for oil leaks.
50 hr
Inspect for leaks, loose mounting hardware, and defective gaskets.
50 hr
Manifold
Tighten loose mounting hardware. During first weekly servicing of
new or reconditioned engine, let engine warm up to normal
operating temperature and tighten all loose bolts between 25 and 32
ft-lb torque.
Inspect for leaks, corrosion, loose mounting hardware, and defective
50 hr
gaskets. Tighten loose mounting hardware.
If engine valves are noisy, or loss of power is noticed, inspect valve
50 hr
Valve mechanism
mechanism. Remove valve covers and adjust valve lifter clearance
as needed. Correct intake valve lifter clearance is 0.0080 inch; ex-
haust valve lifter clearance is 0.0160 inch. Replace cover gaskets as
necessary.
Inspect ignition magneto for loose mounting bolts and loose wiring
50 hr
Magneto
connections. Correct any defects. Remove end cap and inspect
distributor cap for cracks and corroded terminals. Check breaker
point gap; correct gap is 0.015 inch at full separation of points.
Inspect for loose spark plugs, poor connections, and dirty or broken
50 hr
insulators. Replace damaged spark plugs. Clean dirty spark plugs.
Set spark plug gap to 0.0300 inch.
Check for loose mounting hardware. Examine brushes, brush holders,
50 hr
Starter motor
and sprinngs. Inspect commutators for dirt and scoring. Correct or
report defects.
50 hr
Check for loose mounting hardware, and loose electrical connections.
Correct defects.
Check to ensure roper operation, tight electrical connections, and
50 hr
Voltage regulator
firm mounting. Voltage regulators should allow appreciable charge to
battery after starter is used. After battery is fully charged. AM-
METER should read only a slight charge. Tighten loose mounting
hardware and electrical connections. Adjust or replace defective
voltage regulator.
Inspect control panel for loose mounting hardware and missing shock
50 hr
Control panel
mounts.
50 hr
Check to see that all gages indicate correctly and that glass is not
Gages and meters
cracked or broken. Tighten loose mounting hardware and hydraulic
connections. Replace any defective or damaged gage.
Check to see that all meters are tightly mounted and operate proper
ly. Check that glass is not cracked or broken and pointers are not
bent or broken. Tighten loose electrical connections and mounting
hardware. Replace any defective or damaged meter.
Inspect all control valves for packing leaks. Check to see that the
50 hr
Control valves
operate properly. See that handwheels are tightly mounted. Tighten
packing, or replace if necessary. Replace any defective or damaged
valve.
Change 2
3-8

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