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TM-55-4920-226-15 Test Stand Aircraft Hydraulic AHT-5A-1 Type D-5A Manual
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Direct and General Support Preventive Maintenance Services
DIRECT AND GENERAL SUPPORT
MAINTENANCE INSTRUCTIONS
Section I. SPECIAL DIRECT AND GENERAL SUPPORT
MAINTENANCE TOOLS AND EQUIPMENT
No special tools are required to perform direct and general support maintenance of this hy-
draulic test stand.
Section Il. PREVENTIVE MAINTENANCE SERVICES
vialed for the information of the person per-
77. General
forming the inspection. An X in this column
P r e v e n t i v e maintenance is performed by
indicates that an inspection should be made of
direct and general support maintenance person-
the listed items in accordance with instructions
nel at 50 and 100 hour intervals. The preventive
given in the text opposite. The indicated items
maintenance services to be performed at these
and instructions constitute minimum inspection
regular intervals are listed  - in paragraph 78.
requirements for the equipment.
The first column headed "inspection", is pro-
78. Direct and General Support Preventive Maintenance Services
GENERAL
50 hour
Inspection
100 hour
x
x
x
Before-operation services. Perform the services listed in daily before-operation services
(par. 54).
x
x
x
Lubrication. Inspect for missing or damaged lubrication fittings and inspect for indi-
cations of improper lubrication. Inspect lubricant level in engine crankcase. Inspect
for oil and grease leaks; also inspect for defective or damaged oil seals.
x
x
Lubricate as necessary in accordance with the lubrication chart. Replace missing or
damaged fittings. Correct all oil or grease leaks.
x
x
x
Appearance.  Inspect the general appearance of the equipment, paying particular
attention to cleanness, legibility of identification markings, and conditions of the
paint. Correct all deficiencies noticed.
x
x
x
Cylinder heads, manifold and muffler.  Inspect the cylinder heads, manifolds, and
muffler for leaks, loose mounting and defective gaskets. Tighten loose manifolds and
muffler mounting bolts and nuts.  During the first weekly servicing of a new or
reconditioned engine, inspect all the cylinder head bolts for tightness . After warming
up the engine to operating temperature, tighten any loose bolts to 25 to 32 ft-lb
torque. Replace defective cylinder head and manifold gaskets.
x
x
x
Valve mechanism.  If the valves are noisy or loss of power is noticed, inspect the
condition of the valve mechanism.
x
x
Remove valves covers and adjust valve lifter clearance if necessary (par. 125). The
correct clearance for the valve lifters is 0.0080 inch for the intake valves and 0.0160
inch for the exhaust valves. Replace cover gaskets if defective.
x
x
Compression test. Remove the spark plugs and test the cylinder compression by turning
the engine over several times to stabilize gage reading. If the gage reading varies
more than 10 pounds between the four cylinders, inspect the cylinder head bolts for
tightness.
AGO 5742

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