ENGINE FAULTS
A number
of
possible faults ore listed below,
together
with likely causes.
A. Eng
ine
refuses
to
st
art
,.
locating
pin for contact-breaker
a) Plug
not
sperlling.
because
arm
worn,
5.
Spar
k plug
or
spark
plug terminal
1.
Plug
oiled
up.
damp,
sh
orted
or
or
ignition
armature
not
in
order.
damaged,
b)
Engine four-Sh'okes
and
doe
s not
2.
Exteri
or of
plug wei,
3.
I~n
il
ion
lead
loose or broken,
reach s
peed
, becou
sc
,.
S
or
t·circuit bullon jams, or
I.
Choke closed,
leads fr
om
eng
in
e
ore
domaged,
2.
Corburettor floods
due
10
dogged
5.
Breaker-contacts oiled up,
domp
or
or
domo~ed
inlel needle S6(lling,
burnt,
3.
Exhaust uet
clogged
with
corhon,
6.
~nition
armature
or
condenser
,.
Corburett
or
selling incorrect
or
jets
omcged.
loose,
b)
No
fuel reaching engine,
because
5.
lnlake silencer soiled.
1.
No
fuel
in
lank,
<) Engine pinks
01
full
speed
under
2.
Fuel cock closed,
load
,
becaus
e
3.
Fuel
slrainer
clo!ged,
1.
~nilion
100 for
advanced,
4. Fuel line
bloch
,
2.
ombUSlion chamber needs
5. Jets
clogged.
decarbonizing,
<)
Fuel
mi
xture not ignilgble,
because
3.
Cool
in
g fins soiled,
,
Small
end
bushing worn.
1.
Carburetlor
flooded,
2.
Waler
in
carbure
tl
or,
d)
Engine backfir
es
or
spits inlo
3.
Infil lroled
air
due
to loose cgrburettor, because
corbureltor.
1.
Engine nol getting
adequole
fuel,
d)
lock of compression,
becaus
e
2.
Spark plug glows
due
to incorrect
1.
Piston
rin~s
broken,
heat
value,
3.
Spark
plug shorted, dirty
or
2.
Piston
on
cylinder worn,
vitrified,
3.
Vent
cock:
on crankcase
0hen,
,.
Engine getting inf
il
trated
air,
,
Cylinder h
ead
or
spark p ug loose.
5.
Water
in
carburellor.
B.
Engine
la
cks
power
e) Engine
geb
100 hot
and
piston
sei
les,
because
a)
Du
e to dirty
cam
pon
enb,
b
eca
u
se
1.
Engine
bad
ly
decarbonized
(pist
on
1.
Intake silencer soil
ed,
crown polished clean],
2.
Exhausl
and
transfer p
or
ts
in
2.
Engine not getting su ficient fuel,
cylinder
clogged
with
carbon,
3.
CarbureHor adjusted incorrectly
or
3.
Thick
carbon
deposit
in
cy
lind
er
wrong oil used,
head,
,.
Coo
ling fins
on
cylinder
and
,.
Fuel tank
gets
no
air
(f
ill
er
cop),
cylinder
head
soiled,
5.
Spark plug vitrified.
5.
There
ar
e pre-ignitions.
b)
Du
e
10
lock
of
compression,
because
I)
Engine has no idling
speed,
becau
se
~ee
und
er
M
lack
of
compression,
1.
Idling adjus
tm
ent
screw
or
idle
stop
ecouse
M
).
screw incorrectly
ad
justed,
2.
Control
coble
for butterlly volve
C.
Other
e
ngin
e
faults
wronglyadjusted,
a) Engine runs unevenly,
because
3.
Ignition
arma
tu
re
damaged.
I.
~nition
lead
loose
or
damaged,
g)
Fuel consumption
of
engine
is
too
2.
ngine
overheats;
fuel
vapor
lock:
in
high,
because
carburettor
int
errup
ts lue l
sdPly,
1.
Fuel tonk, fuel line
or
carbureltor
3.
Conl
act-brea
k
er
points a
il
e up
or
leaking,
fused,
2.
Jels too large.
SS
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