MASSEY FERGUSON MF 14 - Page 80

MASSEY.FERGUSON
TECUMSEH
ETG'TYES
MODEL
H7O
GROUP
O_SECTION
V_PART
9
2. Using
a
tester,
check
for
breakdown
capacitance
and
series
resistance.
A
condenser
in
good
condition
should
have
a capacitance
of
'025-'033
mfd'
Flywheel
Magnets
if
i,
i, suspected
that
the
magnets
are
the
fault
of
improper
magneto
operation,
place
fylvheel
upside
doi"n^on
a
wooden
,lntf""".
Hola
a
screwdriver
with
the
point
down.
Move
the
blade
to
within
one
inch
of
th"
magnets
cast
into
the
flywheel'
The
magnets
should
attract
the
screwdriver.
Other
Magneto
Parts
l.
Inspect
breaker
cam
for
excessive
wear'
scoring
or
other
damage.
2.
Inspect
core
assembly
for
bent
laminations'
dis-
tortion
or other
damage.
3. Inspect
all
eleclrical
leads
for
wear'
insulation
breaks,
int""nt"
terminals
or
other
damage'
Reassembly
& lnstallation
1. If
coil
was
removed
from
core,
reinstall
coil
as-
sembly.
Carefully
support
center
of
core
to
prevent
distorting
lamination^s-
while
sliding
on
coil'
Bend
holding
clip.
2.
Position
magneto
assembly
on
crankcase
assembly
so
the
timing
-uik,
are
aligned'
The
exact
aligning
of
the
timing
-atkt
is very
necessary
for
proper
timing
of
the
ignition
system.
(If
either
of
the
parts
contain-
ing
the
ti*ittg
marks
was
replaced,
time
the
magneto
as"described
in
the
sub-heading,
"Engine
Timing"')
Engine
Timing
1. Remove
cylinder
head
and
gasket'
2.
Turn
crankshaft
until
piston
reaches
top
dead
center.
Turn
crankshaft
counterclockwise
to
its
BTDC
dimension
(Fig. I0).
3.
Loosen
the
two
screws
that
hold
the
magneto
to
the
cylinder
and
position
the magneto
so
the
cam
on
the
ciankshaft
just
starts
to
open
the
breaker
points'
Tighten
the
magneto
mounting
screws'
I.
Re"sr"mble
engine.
Tighten
head
bolts
to
torque
indicated
in
"SPecifications".
ELECTRIC
STARTER
MOTOR
Refer
to
Fig.
It.
l. Hold
the
pinion
gear
firmly
in
a
brass
jawed
vise
when
removin[
or
tigltening
the
castellated
nut'
The
nut
must
be
torqued
to
a minimum
of
100
in'-lbs'
If
nec-
essary,
continue
tighiening
the
nut
unt^il
the
cotter
pin
"un
b"
inserted
into
the
hole
in
the
shaft
and
the
slot
in
the
nut.
2. Use
the
spacing
washers,
as
required,
to obtain
an
armature
end
plaY
of .005"-.015"
3. Apply
"
nh
of
SAE
No'
10
oil
to
the
bearing
por-
tiorr,
"ttd
splines
of
the
armature
shaft
before
assembly'
4.
Tightin
the
input
terminal
nut
next
to
the
housing
to 5O
in.-lbs.
torque.
5.
The
brush
shunt
is
approxim
ately
%"
longer
than
is
necessary
for
the
grounded
brush;
remove
any
excess
shunt
remaining
a[er
soldering
to
the
grounded
brush
terminal.
6. Assemble
the
thrust
spacer
to
the
commutator
end
cap
bearing
bore
with
the
convex
surface
facing
the
open
end
ofthe
bore.
7. Tighten
the
thru-bolts
to
30-35
in'-lbs'
torque'
Pertormance
fe$
(No
Load)
This
motor
should
NOT
be
operated
continuously
for more
than
t5 seconds
when
testing'
Applied
Voltage
"
6'0
Vti"i*"-RPM.
'6500
Maximum
Current
Draw
'
"
'
25
Amperes
Use
a
fully
charged
6 volt
battery
and
connect
it
to
the
input
terminal
of
the
starting
motor
through
a
switch.
U^se
test
leads
of
No.
I0 cable
or
larger
which
should
not
be
over
6
feet
in
length'
Check
the
opera-
tion
of
the
drive
assembly
by
applying
rated
voltage
momentarilY.
If
the
unit
does
not meet
this
test'
check
for
the
following:
Binding
armature
Annealed
brush
sPrings
ImproperlY
seated
bmshes
Insufficient
armature
end
PlaY
Shorted
or
open
armafure
Shorted
or
grounded
field
Poor
electrical
connections