TM 5-6115-405-5
Section II. TROUBLESHOOTING
Probable cause
Possible remedy
5-3. General
Spark plug oxide fouled
Check for excessive com-
This section provides information useful in diagnosing
indication (electrode
bustion chamber deposits
and correcting unsatisfactory operation or failure of the
covered with ashlike
(para 6-15), clogged
generator set or any of its components. Each trouble
deposits).
muffler (para 34),
symptom stated is followed by a list of probable causes.
clogged cylinder exhaust
The possible remedy recommended is described
port or exhaust manifold
opposite the probable cause.
(para 3-9), use of non-
recommended oil, or too
5-4. Engine Fails to Start or Starts With Difficulty
much oil in fuel mix
(para 26-).
Probable cause
Possible remedy
Breaker points defective
Regap or replace breaker
5-5. Engine Lacks Power
or improperly gapped.
points (para 6-4).
Capacitor defective ............Replace capacitor (para
Probable cause
Possible remedy
Piston rings worn
Replace piston rings
Carburetor dirty or
Clean or replace defective
defective.
carburetor parts (para
Cylinder worn or scored
Replace cylinder (para
Starter binding or
Check and correct trouble
Damaged bearings
Replace bearings (para 6-8
defective.
and 6-16).
Spark plug overheated
Check for carbon-clogged
Carburetor dirty
Clean or replace defective
indication (electrode
muffler (para -8),
carburetor parts (para
burned, insulator tip
cylinder exhaust port
light gray or chalk
and exhaust manifold
Parts binding
Check and replace damaged
white).
(para 3-9), lean carbure-
parts (para 6-16).
tor setting (para 2-23),
Damaged or leaking
Check crankcase for cracks
air leak in fuel line from
or broken gaskets (para
fuel tank to carburetor
(para 3-10), or ruptured
fuel pump diaphragm in
5-6. Engine Speed Erratic or No Generator Output
carburetor (para 6-19).
Spark plug wet fouled
Check for incorrect car-
Probable cause
Possible remedy
indication (insulator tip
buretor adjustment
Governor parts damaged
Replace damaged parts
black, damp oily film
(para 3-23), air cleaner
over firing end, carbon
element clogged (para
Generator stator windings Replace generator stator
layer over entire nose).
3-7), wrong fuel mix
damaged.
(para 2-c), or faulty
Governor to carburetor
Adjust linkage (para
ignition parts (para
linkage parts damaged
3-12) or replace damaged
or incorrectly assembled
parts (para 6-12).
or adjusted
Intermediate ignition
Replace coil (para 6-3).
coil failure.
Section III. RADIO INTERFERENCE SUPPRESSION
are the shielded ignition cable (fig. 1-1) and the integral
5-7. General
suppressor-type spark plug.
Refer to TM 11-483 for definitions, purposes, source
5-9. Replacement of Suppression Components
and methods used to obtain
proper radio suppression.
a. Removal.
5-8. Interference Suppression Components
(1) Disconnect the shielded ignition cable
The suppression components used on the generator
from the spark plug, using a 3/4-
set
5-9