MASSEY FERGUSON MF 14 - Page 56

MASSEY.FERGUSON
IGNITION AND ELECTRICAL
SYSTEM
GROUP
O-SECTION
V-PART 4
Fig.
4
c. If
voltage reading is
less than
"14"
volts D.C.
but
greater
than
"0"
voltage, check alternator.
Disconnect
plug
from
regulator-rectifier
and
test
A.C.
voltage at
plug with engine
running
at
full
throttle. Should
have
not less than
"20"
volts
A.C.
Fig.3.
3. With battery connected, run
engine at
idle,
check
B*
to
ground
voltage
with D.C.
voltmeter.
If
reading is I3.8 volts or
higher,
place load
(turn
on
headlights)
on battery
and
reduce battery
voltage
to
or
below 13.6
volts.
Fig. 2.
Increase
engine
speed
to full
throttle and
if
voltage increases, system
is
O.K.
Trouble
Shooting
Fig.
5
If
voltage does
not increase, replace regulator-
rectifter.
If battery
does
not
charge up,
replace battery.
4.
Battery
boiling or always
charging at
high
rate.
Check B*
to
ground voltage with D.C.
volt-
meter.
Fig.4.
a. If
voltage over I4,7
the regulator-rectifier
is
not functioning
(replace).
b. If
voltage
under
14.7 the baltery charge
is low.
The Alternator
is
O.K.
Make a
complete battery check.
IGNITION
CHECK
Check
the
ignition
by
removing
the high tension
lead from the spark
plug.
Hold
the terminal approxi-
mately Ll4"
from the
spark
plug.
Crank engine
over
rapidly.
If a
spark
jumps
the Ll4"
gap,
the ignition
is
serviceable. Remove
plug
and
check;
replace if dam-
aged. Check
and
set
electrode
gap
at
.030". Tighten
plug
to
25-30 ft.lbs. torque
upon
installation.
Ignition
failures
are,
at times, caused by something
other
than ignition
parts.
Such items as
(l)
shorting
at
grounded
devices,
(2)
switches,
(3)
loose, corroded and
disconnected
terminals,
(4)
frayed and
grounded
wires
and
(5)
weak or dead battery.
POINTS
(Magneto
lgnition System)
Refer
to
Fig.
6.
ADJUSTING
II .
scREw
\<-\
CHECK
DIAMETER
FOR
WEAR
.138