79
MS 460, MS 460 C
Complete system
The generator and heating element
are checked in the following test
which should be performed at an
ambient temperature of at least
+ 20 °C (68 °F).
If the temperature is lower than
+ 13 °C (55 °F), the thermostatic
switch may close and produce false
readings.
Test the thermostatic switch
separately.
– Remove the filter base,
b
12.1
– Set the ohmmeter to measuring
range “
!
“.
:
Clip one of the two test leads to
the carburetor body and the other
to a cylinder fin (ground).
VA
176RA314
100
50
30 20
10
5
0
20
10
5
3
1
– If the system is in good condition
the ohmmeter will indicate about
8
!
in measuring range "
!
"
$"
If the reading obtained is outside
this tolerance, test each component
separately.
Heating element
– Disconnect pin and socket
connector to heating element.
:
Clip one test lead to the metal of
the heating element, and the
other test lead to the wire that
100
50
30 20
10
5
0
20
10
5
3
1
VA
176RA315
goes to the heating element.
– If the heating element is in good
condition the ohmmeter will show
a reading of about 8
!
in
measuring range “
!
“.
If the reading obtained is outside
this tolerance, install a new heating
element.
Thermostatic switch
– Disconnect pin and socket
connector to thermostatic switch.
:
Clip one test lead to the metal of
the heating element, and the
other test lead to the wire that
goes to the thermostatic switch.
100
50
30 20
10
5
0
20
10
5
3
1
VA
176RA316
At temperatures above + 20 °C
(68 °F), the ohmmeter must indicate
an infinitely high value in measuring
range “
!
“.
Cool the switch down to below
+ 6 °C (42 °F). The ohmmeter must
indicate a value of about 0.5
!
in
measuring range “
!
“. If a higher
value is indicated, install a new
thermostatic switch.
13.1
Testing