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Section III. PREVENTIVE MAINTENANCE SERVICES
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TM-55-4920-226-15 Test Stand Aircraft Hydraulic AHT-5A-1 Type D-5A Manual
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Engine Knocks or Develops Excessive Noise
Procedures
Oil. Check the oil level in the engine crankcase. Add oil if the oil is not at the proper
level.
Air Cleaner. Inspect the air cleaner for accumulated dirt. Clean if necessary.
Battery. Clean the battery and see that the terminal connections are tight. Check the
level of the electrolyte. Add water as necessary to bring the level to three-eighths of
an inch above the plates.
Tires. Inspect the tires for cuts, leaks, fabric breaks, and uneven wear. Check the
tires for proper inflation. Correct tire pressure is 30 psi. Report a defective tire
to direct and general support maintenance.
Cooling System. Inspect the condition of the fins on the engine. See that they are clean
and free from dust and dirt. Inspect the engine shrouding for correct installation
and loose or missing mounting bolts. Correct all deficiencies or report them to direct
and general support maintenance.
Fuel Strainer. Inspect the bowl of the strainer for accumulation of water, dirt, and
foreign matter. Clean the fuel strainer if necessary.
Instruments. Inspect all instruments for broken glass, improper operation, and insecure
mounting. Report all deficiencies to direct and general support maintenance.
Section IV. TROUBLESHOOTING
55. General
is followed by a list of probable causes of the
This section provides information useful in
trouble. The possible remedy recommended is
diagnosis and correction, inspection, operation,
described opposite the probable cause.
or failure of the hydraulic test stand, or any of
its components. Each trouble symptom stated
56. Engine Hard to Start or Fails to Start
Probable cause
Possible remedy
Carburetor not choked sufficiently ----------------------- Pull choke control further out.
Carburetor flooded. --------------------------------------------------
Push in choke control and crank until engine fires.
Water or dirt in fuel strainer --------------------------- Clean the fuel strainer (par. 9).
Battery cables loose or terminals corroded ------------ Tighten battery cable connections or remove and clean
cables as required (par. 9).
57. Engine Misses or Runs Erratically
Probable cause
Possible remedy
Water, dirt, or gum in the fuel -------------------------- Clean the fuel strainer and drain fuel tank and fill
with clean fuel (par. 9).
A i r cleaner clogged ------------------------------------ Service air cleaner (par. 52).
Carburetor out of adjustment --------------------------- Report to direct and general support maintenance.
58. Engine Stops Suddenly
Probable cause
Possible remedy
Water or dirt in fuel strainer --------------------------- Clean the fuel strainer and drain the fuel tank and
fill with clean fuel (par. 9).
Air  cleaner  clogged  ---------------------------------------------  Service  the  air  cleaner  (par.  52).
59. Engine Overheats
Possible remedy
Probable cause
Crankcase oil level too low ------------------------------ Stop engine and add oil to proper level.
AGO 5742A

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