Stihl MS 311 User Manual - Page 42

Testing the Ignition, Module, Using the ZAT 4 ignition tester, Using the ZAT 3 ignition tester

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Using the ZAT 4 ignition tester 1 5910 850 4503 Using the ZAT 3 ignition tester 5910 850 4520 2 a 4903RA277 TG 165RA183 TG 165RA184 TG 1 : Fit the boot (1) on the spark plug. : Line up the sleeve (2) - distance 'a' about 3 mm to the edge of the housing and its open side (arrow) facing the cylinder. 1 2 3 - Before starting the test, install a new spark plug in the cylinder and tighten it down firmly. 23 4 - Before starting the test, install a new spark plug in the cylinder and tighten it down firmly. - 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 spark test, not to ignition timing. : Connect the spark plug boot to the input terminal (1) and push the tester's output terminal (3) onto the spark plug. High voltage - risk of electric shock. - Crank the engine quickly with the rewind starter and check spark in the tester's window (2). : Connect spark plug boot to the terminal (2). : Attach the ground terminal (1) to the spark plug. : Use adjusting knob (4) to set the spark gap to about 2 mm, see window (3). 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 window (2), check the ignition system with the aid of the troubleshooting chart, b 7.8 MS 311, MS 391 41

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41
MS 311, MS 391
:
Fit the boot (1) on the spark plug.
:
Line up the sleeve (2) – distance
'
a
' about 3 mm to the edge of the
housing and its open side
(arrow)
facing the cylinder.
–
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
spark test, not to ignition timing.
4903RA277 TG
2
1
a
Using the ZAT 4 ignition tester
5910 850 4503
–
Before starting the test, install a
new spark plug in the cylinder
and tighten it down firmly.
:
Connect the spark plug boot to
the input terminal (1) and push
the tester's output terminal (3)
onto the spark plug.
High voltage – risk of electric shock.
–
Crank the engine quickly with the
rewind starter and check spark in
the tester’s window (2).
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
window (2),
check the ignition
system with the aid of the
troubleshooting chart,
b
7.8
165RA183 TG
1
2
3
Using the ZAT 3 ignition tester
5910 850 4520
–
Before starting the test, install a
new spark plug in the cylinder
and tighten it down firmly.
:
Connect spark plug boot to the
terminal (2).
:
Attach the ground terminal (1) to
the spark plug.
:
Use adjusting knob (4) to set the
spark gap to about 2 mm,
see window (3).
165RA184 TG
1
2
3
4