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Arm and Support Assemblies
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TM-55-4920-226-15 Test Stand Aircraft Hydraulic AHT-5A-1 Type D-5A Manual
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Ammeter Shows No Charge or Discharge With Engine Operating
D E P O T MAINTENANCE INSTRUCTIONS
Section I. DEPOT MAINTENANCE SPECIAL TOOLS AND EQUIPMENT
No special tools or equipment are required to perform depot maintenance of this test stand.
Section Il. TROUBLESHOOTING
170. General
This section provides information useful in diagnosis and correction, inspection, operation,
or failure of the hydraulic test stand, or any of its components. Each trouble symptom stated
is followed by a list of probable causes of the trouble. The possible remedy recommended is de-
scribed opposite the probable cause.
171. Engine Hard to Start or Fails to Start
Probable cause
Possible remedy
Magneto defective ------------------------------------------------------ Repair or overhaul the magneto (par. 185).
Valves defective  -------------------------------------------------------  Reseat  or  replace  defective  valves  (par.  186).
172. Engine Misses or Runs Erratically
Possible remedy
Probable cause
Magneto defective ----------------------------------------------------- Repair or overhaul the magneto (par. 185).
Valves burned, warped, or broken --------------------------- Grind or replace valves (par. 186).
Valve seats cracked --------------------------------------------------- Reface valve inserts (par. 187).
Compression  poor  ----------------------------------------------------  Replace  valves  (par.  186).  Replace
and/or
piston rings (par. 195).
173. Engine Stops Suddenly
Probable cause
Possible remedy
Magneto defective --------------------------------------------------- Repair or overhaul magneto (par. 185).
Replace bearing and repair or replace crankshaft (par.
Connecting rod and crankshaft bearings seized due to
196) .
lack of oil.
174. Engine Will Not Idle Smoothly
Probable cause
Possible remedy
Valves burned, warped, or sticking ----------------------------- Grind or replace valves (par. 186).
Valve springs weak or broken ------------------------------------ Replace defective valve springs ( par. 186).
Piston rings worn --------------------------------------------------- Replace piston rings (par. 195).
Pistons and cylinder walls scored ------------------------------------  Rebore cylinder blocks and install oversize pistons and
rings (pars. 195 and 199).
175. Engine Knocks or Develops Excessive Noise
Probable cause
Possible remedy
Connecting rod and crankshaft bearings defective ------------ Replace worn or defective bearings (pars. 195 and 196).
Oil pump defective ---------------------- ---------------------------  Repair or replace oil pump (par. 193).
176. Engine Exhaust Smokey
Probable cause
Possible remedy
Pistons and/or piston rings defective------------------------- Replace pistons and/or piston rings (par. 195).
AGO 5742A

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