14 7.4 Testing The - Stihl MS 231 Manual

1
2
Crimped side of terminal (1) must
face outwards.
: Connect the short circuit wire
terminal (1)
– the terminal must be pushed
fully home.
: Push the short circuit wire (2) and
protective tube (3) into the guide
so that "a" is about 5 mm.
– The protective tube must be
pushed into the grommet on the
air guide shroud as far as stop.
1 4
2
3
: Push short circuit wire (1) and
ground wire (2) fully into the
guides (arrows) and push the
retainer (3) into the slot in
retainer (4) until it snaps into
position.
– The wiring harness is secure.
MS 231, MS 231 C, MS 251, MS 251 C
All manuals and user guides at all-guides.com
3
: Fit the boot (1) on the spark plug
so that it is parallel to the air
guide shroud.
: Push the ignition lead (2) fully
into the guide (arrows).
– Note installed position of
ignition lead, see illustration.
Ignition lead and spark plug boot
must not touch the air guide shroud.
: Push the retainer (1) into the
slot (arrow) until it snaps into
position.
– Reassemble all other parts in the
reverse sequence.
7.4 Testing the Ignition
Module
To test the ignition module, use
either the ZAT 4 ignition system
tester 5910 850 4503 or the ZAT 3
ignition system tester
5910 850 4520.
The ignition test refers only to a
1
spark test, not to ignition timing.
Using ZAT 4 ignition system
5910 850 4503
2
– Before starting the test, install a
: Connect spark plug boot to the
1
High voltage – risk of electric shock.
– Crank the engine quickly with the
The engine may start and
accelerate during the test.
If a spark is visible, the ignition
system is in order.
– If no spark is visible in the
1 2
new spark plug in the cylinder
and tighten it down firmly.
input terminal (1). Push the
tester's output terminal (3) on to
the spark plug.
rewind starter and check spark in
the tester's window (2).
window (2), check the ignition
system with the aid of the
troubleshooting chart, b 7.8
3
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