Mooney M20C - Starter Solenoid Replacement; Sticking Contact Issue; Installation Steps

MOONEY
SERVICE
INSTRUCTION
NUMBER:
S.I.
M20-62
DATE:
10-13-82
SUBJECT:
REPLACEMENT
of
COLERERSEE,
STARTER
SOLENOID
7iIH
CUTLER-HAMMER,
P/N
6041H105A
MODELS
Mooney
Model M20g
S/N
25-0681
thru
25-0719
and
any
M20
series
aircraft
that have
had
a
Cole-Hersee
solenoid
installed
in
plan
of the
original
PrestoLite.
TIME
OF
COMPLIANCE:
At the
nut
scheduled
maintenance
or
sooner
at
owners
discretion.
INTRODUCIlON:
There have
beenreports
of the
contacts
sticlring
closed
on
CoIe-Hersee
starter
solenoids
on
Mooney
M20g
airplmes.
This
causes
power
transmission
to
the_starter
when
the
master
switch is
turned
on.
The
propeller
will
rotate
bat
the
engine
will
not
start
if
magneto
switch
is off.
It
is
recommended that the Cole-Hefiee
solenoid
be
replaced
with
the
improved
solenoid.
INSTRUCTIONS:
iC*UllIlNl
CAUTION
Exetcise
ertreme
caution
in the
area
of the
propeller
when
energizing
the
electrical
system.
a)
Pull
AUX.
BUS
and
IGN-TACR,
CIG LTR
circuit
brea~ers,
or
disconnect
battery.
b)
Disconnect
electrical
wiring
from the fear
(4)
terminals of
the
Coie-Hersee
solenoid. The
solenoid
is
located
on
the
coc~lpit
side
of
firewalI forrvard of
the
co-pilot
seat
on
M20g and
h1205. Earlier model aircraft
have
solenoid located
on
engine
side of
~ewaI1,
ontboard side of
pilots
footwell.
c)
Remove
solenoid
from
the
firewalIby
unscrewing
(2)
AN3-3A
bolts
or
MS35206-263
screws
from
nut
plates.
d)
Retain
ground
wire
(21PS10~8)
to
use
with
new
solenoid.
e)
Drill
oat
rivets
attaching
upper
nut
plate,
see
drawing
940020,
and
remove
nut
plate.
Clean
up
bum
and debris.
a
Enlarge
rivet
hole
per
drawing
940020
for
mounting
new
solenoid.
h)
Plug
the
lower
told)
mounting
hole
with
AN3-3A
bolt
and
AN960-10 washer
per
drawing
no.
940020.
i)
Secure
solenoid,
P/N
6041H105A,
with
(2)
AN3-3A
bolts,
(1)
AN970-4
washer,
(4)
AN960-10
washer
and
(2)
AN365-1032
nuts
in the
new
location
pet
drawing
no.
940020.
NOTE: man
ground
wire,
21PS10A18,
under bolt
head
per
940020
drawing.
j)
Seal
any
holes
or
openings
in
firewall with Proseal 700 sealant
per
drawing
940020.
L)
Ream
holes
in
wire
terminals
to
acwpt
3/8"
posts
on
solenoid.
1)
Connect
the
electrical
wires
to
terminal
posts
on
new
solenoid
per
drawing
940020.
Relative
position
of
wires
will
change
very
little
from
replacement
of the
old
solenoid
with
the
new
solenoid.
m)
Verify
that
no
interference
is
present
between
new
wiring
location
and
any
other
components
or
structure.
n)
Chac~
system
for
normal
operation
and
return
aircraft
to
service.
O)
Enter
compliance
note
into
log
boot
REFERENCE
DATA..
Drawing
940020,
Cutler-IIammer
Solenoid
Retrofit
PARTS
I;IST:
Order
940020-501
git.
FIGURE/TABLES:
See
Drawing
940020.