TM 9-4940-421-14
Table 4-1. Organizational Preventive Maintenance Checks and Services (cont)
LOCATION
NOT FULILY MISSION
ITEM TO
PROCEDURE
CAPABLE IF:
INTERVAL
CHECK/SERVICE
Spark plug wires are
Note engine firing order and discon-
Semiannual- Spark Plug and Coil
nect spark plug and coil wires (7).
faulty or engine is misf-
ly or every Wires
Clean wires with wiping rag (item 4,
iring due to the spark
500 hours of
appx D). Inspect wires and boots for
plug or coil wires.
operation,
whichever
for lack of continuity in wire and re-
comes first
place as necessary.
Cap or rotor are
Remove and inspect distributor cap
Semiannual- Distributor Cap and
(8) and rotor (9) for carbon tracks.
cracked, if terminals or
ly or every Rotor
Clean with wiping rag (item 4,
contacts are burned
500 hours of
appx D). Check for cracks and breaks
back too far, or if engine
operation,
is misfiring due to
whichever
terminals and contacts. Remove
faulty cap or rotor.
comes first
burned spots or corrosion with extra
fine sandpaper. Replace distributor
cap and/or rotor if cracked or broken
or if terminals or contacts are burned
back too far.
Breaker points are
Remove distributor cap (8), rotor (9)
Quarterly or Breaker Points and
and advance arm clamp screw (10)
burned back so that cor-
250 Condenser
every
and check breaker points (11) for
rect point gap cannot. be
hours of oper-
burned or pitted contacts and worn
set, if cam follower is
ation, which-
cam follower. File faces of points to
worn down too far, or if
ever comes
remove burned spots and pitting. If
engine is misfiring due
first
point faces are excessively burned/
to faulty breaker points
pitted or cam follower is worn down
or condenser.
too far, replace points (condenser (12)
should be-replaced at the same time as
the breaker points).
4-2.3
Change 1
