Hercules JXD - Page 12

TM 9–1706
HERCULES JXD GASOLINE ENGINE FOR SCOUT CARS 7-8
for cracks . Inspect breaker points and spring , high - tension rotor ,
and
metal inserts in cap for pitting and burning . Try cam for evidence of
wear , looseness , or breakage of governor springs .
e
.
Starting
motor
.-
(
1
)
Examine
all
connections
and
terminals
.
(
2
)
Inspect
and
test
starting
switch
.
(
3
)
Inspect
commutator
and
brushes
.
f . Engine
.—
( 1) Check
crankcase
, block
, head
, and
head
gasket
for
cracks
or leaks
. See
that
all
bolts
are
tight
.
( 2 ) Remove cover and examine valve push rods , springs , and valve
clearances .
( 3 ) Run engine and listen for slapping pistons , knock at bearings ,
or knock due to presence of carbon .
( 4 ) Check oil pressure for steady and normal reading with engine
running .
g
.
Fuel
system
.-
(
1
)
Inspect
mounting
and
connections
of
fuel
pump
and
check
its
operation
.
Examine
fuel
tanks
for
leaks
or
damage
.
( 2 )
Examine
carburetor and
air
cleaner
. Try
all
screws
.
Inspect
connections
to
accelerator
and
dash
.
( 3 ) Check
fuel
gage
and
switch
.
.
h
.
Lubrication
system
.-
(
1
)
Check
oil
pressure
at
gage
.
(
2
)
Check
oil
line
connections
and
brackets
for
tightness
.
SECTION
IV
POWER PLANT TROUBLE SHOOTING AND TUNE - UP
WHILE INSTALLED
Paragraph
Trouble
shooting
8
Tune
-
up
9
8.
Trouble
shooting
.
Symptom
Cause
a . Engine
skips
or
misses
.
a . ( 1 ) Spark
plugs
cracked
or
dirty
.
(
2
)
High
-
tension
wires
broken
or
shorted
.
(
3
)
Distributor
cap
or
rotor
broken
,
damp
,
or
dirty
.
(
4
)
Faulty
distributor
points
,
condenser , or coil .
( 5 ) Valves adjusted too close
or badly worn guides .