TOPIC 6. TROUBLESHOOTING CHART

TM 10-3930-644-14&P

TOPIC 6. TROUBLESHOOTING CHART

It has been proven that over 90% of the troubles that

In most cases, when trouble is detected and remedied

occur in engine operation are avoided when those

immediately, a more expensive, time consuming repair

persons responsible for maintenance adhere to an

will be avoided. Following are some of the normal

adequate program of lubrication, inspection and

complaints encountered in routine operation and the

maintenance on a regularly scheduled basis. The time

probable causes.

and expense involved in such programs is only a fraction

of that incurred when poor maintenance practice results

For detailed inspection, maintenance and repair

in a major malfunction or breakdown.

procedures, refer to the specific topical section, repair

manual, relating to the malfunctioning component.

TROUBLESHOOTING CHART

TROUBLE

PROBABLE CAUSE

POSSIBLE SOLUTION

Engine will not start.

Weak or dead battery.

Charge or replace battery.

Poor ground connection.

Clean and tighten ground

connection.

Faulty starting switch or

Repair or replace switch

solenoid on starting motor.

and/or solenoid.

Internal engine seizure.

Turn engine manually to

determine cause. Repair

engine.

Engine cranks but will not

Defective wiring or spark

Replace plugs or wiring.

start.

plugs.

Points not gapped properly

Adjust points or replace

or defective.

points.

Defective wiring.

Replace wiring.

Defective ignition switch.

Replace switch.

Defective coil.

Replace coil.

Defective distributor cap

Repair distributor.

or rotor.

No gas in fuel tank.

Fill tank.

Clogged filter or lines.

Clean filter and lines.

Defective fuel pump.

Replace fuel pump.

Tank vent plugged.

Clean vent.

Carburetor flooded

Too much choking.

Carburetor float level im-

Repair carburetor.

properly set.

Defective choke.

Repair choke.

M-104-1

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