Section IV. TROUBLESHOOTING - TM-55-4920-226-150024

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