Section V. TROUBLESHOOTING - TM-5-4320-237-150038

TM 5-4320-237-15

Figure 14. Fuel strainer service.

Section V. TROUBLESHOOTING

Probable cause

Possible remedy

34. General

Magneto improperly

Retime or replace

This section provides infomation useful in

timed or defective.

magneto (para 55).

diagnosing and correcting unsatisfactory oper-

Fuel mixture improper -___ Adjust carburetor (para

52).

ation or failure of the pumping assembly and

Magneto contacts pitted

Adjust or replace mag-

its components. Each trouble symptom stated

or improper] y adjusted.

neto contacts (para 54).

is followed by a list of probable causes of the

Spark plug cable de

Replace spark plug cable

trouble. The possible remedy recommended

fective.

(para 56).

is described opposite the probable cause.

Any trouble beyond the scope of organization-

36. Engine Stops Suddenly

al maintenance shall be reported to direct sup-

Probable cause

Possible remedy

port maintenance.

Fuel tank empty -------------Fill fuel tank.

Fuel line clogged ---------- Remove, clean, and re-

place fuel line (para 51).

35. Engine Hard to Start or Fails to Start

Water, dirt or gum in

Drain, clean, and refill

Probable

cause

Possible remedy

fuel.

fuel tank with fresh

Fuel tank empty---------Fill fuel tank.

gaso1ine.

Fuel shutoff valve closed ------- Open valve (para 15).

Excessive engine heat

Cool engine and restart.

Fuel line obstructed ----------Clean fuel line.

causes vapor lock.

Provide adequate ven-

Spark plug defective --------- Replace spark plug

tilation around engine

(para 56).

Wrong grade of gasoline Use correct grade of

Air cleaner dirty or

Service air cleaner

gasoline.

causes vapor lock

too full of oil.

(pars 28f).

Ignition switch defective -----Refer to direct support

Air vent hole in fuel

Clean out hole in cap.

maintenance.

tank cap clogged