Stihl MS 311 User Manual - Page 45

Short Circuit Wire, Testing, Removing and Installing

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4903RA101 TG 4903RA102 TG 7.7 Short Circuit Wire 7.7.2 Removing and Installing 2 7.7.1 Testing - Pull the boot off the spark plug. 2 - Remove the shroud, b 6.4 - Remove the fan housing, b 8.2 - Disconnect the choke rod, b 10.2.1 4903RA263 TG - Remove the contact spring, 1 b 7.7.4 If the spark plug, ignition lead and spark plug boot are in order, check the short circuit wire. - Remove the fan housing, b 8.2 The ground and short circuit wires are combined in a wiring harness. 1 : Pull the short circuit wire (1) out of the guides (arrows). - Pull the ring terminal (2) off the pin. : Disconnect the short circuit wire (1). - Connect the ohmmeter to ground (2) and the short circuit wire (1). - Set the Master Control lever to "0". The resistance measured must be about 0 Ω. If it is much higher, the reason is a break and the wiring harness has to be replaced, b 7.7. - Set the Master Control lever to "F". 3 2 1 : Pull the ignition lead (3) out of the guide (arrows). : Remove the connector (1). : Take out the screw and remove the ground wire (2). 4903RA099 TG 1 2 : Lift the ring terminal (1) a little and pull it off the pin (2) . - Remove the filter base, b 12.3 1 The resistance measured must be infinitely high. If not, fit a new short circuit wire, b 7.7. 1 Perform the contact and continuity test on the ground wire too. - If no fault can be found, check the ignition system with the aid of the troubleshooting chart, b 7.8. : Pull the short circuit wire (1) out of the guides (arrows). - Reassemble in the reverse sequence. : Pull the wiring harness (1) out of the guides (arrows). 4903RA100 TG 4903RA264 TG 44 MS 311, MS 391

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44
MS 311, MS 391
7.7
Short Circuit Wire
7.7.1
Testing
If the spark plug, ignition lead and
spark plug boot are in order, check
the short circuit wire.
–
Remove the fan housing,
b
8.2
:
Disconnect the short circuit
wire (1).
–
Connect the ohmmeter to
ground (2) and the short circuit
wire (1).
–
Set the Master Control lever to
"
0
".
The resistance measured must be
about 0
Ω
. If it is much higher, the
reason is a break and the wiring
harness has to be replaced,
b
7.7.
–
Set the Master Control lever to
"
F
".
The resistance measured must be
infinitely high. If not, fit a new short
circuit wire,
b
7.7.
Perform the contact and continuity
test on the ground wire too.
–
If no fault can be found, check the
ignition system with the aid of the
troubleshooting chart,
b
7.8.
–
Reassemble in the reverse
sequence.
1
2
4903RA263 TG
7.7.2
Removing and Installing
–
Pull the boot off the spark plug.
–
Remove the shroud,
b
6.4
–
Remove the fan housing,
b
8.2
–
Disconnect the choke rod,
b
10.2.1
–
Remove the contact spring,
b
7.7.4
The ground and short circuit wires
are combined in a wiring harness.
:
Pull the ignition lead (3) out of the
guide (arrows).
:
Remove the connector (1).
:
Take out the screw and remove
the ground wire (2).
:
Pull the wiring harness (1) out of
the guides (arrows).
4903RA099 TG
1
2
3
4903RA100 TG
1
:
Pull the short circuit wire (1) out
of the guides (arrows).
–
Pull the ring terminal (2) off the
pin.
:
Lift the ring terminal (1) a little
and pull it off the pin (2) .
–
Remove the filter base,
b
12.3
:
Pull the short circuit wire (1) out
of the guides (arrows).
4903RA101 TG
1
2
4903RA102 TG
2
1
4903RA264 TG
1