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TABLE V. Lubrication
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TM-55-4920-335-14 Hydraulic Test Stand Type D-5B P/N 674016 Manual
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TABLE VI. Troubleshooting
TM 55-4920-335-14
SECTION V
TROUBLESHOOTING
5-1. TROUBLESHOOTING. Reference to data contained in
5-2.
TROUBLESHOOTING TABLE.
Sections I, III, and IV, particularly the diagrams, will be helpful
troubleshooting chart listing the most common operating
in diagnosis of trouble and possible remedies.
troubles, probable cause, and the remedy.
TABLE VI. Troubleshooting
Trouble
Probable Cause
Remedy
Engine will not start.
Insufficient choke on cold engine.
Choke carburetor and repeat starting procedure.
Engine flooded.
Open choke, open throttle wide and crank engine or allow a time interval
for accumulated gasoline to evaporate.
Dry off cables, replace or connect securely.
Ignition cable, broken or
disconnected.
Spark plugs wet, dirty or
Remove spark plugs, dry and clean thoroughly. Reset gap to 0.030 inch.
improperly gapped .-
Fuel supply exhausted.
Refill tank.
Breaker points pitted, dirty or out
File points, clean with lintless tape and carbon tetrachloride and adjust
of adjustment.
breaker gap.
Engine surges or
Carburetor flooding.
Choke partially closed; open choke fully.
gallops.
Sticking valves.
Remove engine for overhaul.
Defective carburetor.
Replace carburetor.
Water in fuel.
Drain water at fuel tank sump, and clean out fuel filter.
Incorrect spark plug gap.
Set plug gap at 0.030 inch.
Low oil pressure.
Low oil supply.
Refill crankcase to "FULL" mark on dip stick.
Low oil viscosity.
Drain sump, refill with correct oil.
High oil temperature.
Check engine cooling. Note particularly if ventilation inlet is clogged.
Engine bearings worn.
Remove engine for overhaul.
Oil pressure gage defective.
Replace gage.
Internal oil leaks.
Remove engine for overhaul.
High oil temperature.
Low oil supply.
Refill crankcase to "FULL" mark on dip stick.
Dirty or diluted oil.
Drain crankcase sump, refill with proper oil.
Poor engine ventilation.
Open doors. Check ventilation inlet for obstructions.
5-1

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