Section 10
ELECTRICAL SYSTEM
Subsection 02
(IGNITION SYSTEM)
10-02-18
SMR2002-038_10_02A.FM
947 Engines
Primary Winding
1. Remove the 1 female spade connector from the
primary side of the ignition coil.
2. With the multimeter set on the resistance scale,
connect the meter probes to the primary termi-
nal of the coil and the ground.
3. Resistance should be between 0.33 - 0.62 ohm.
Secondary Winding
The spark plug caps must be removed from high
tension cables, because they are resistor caps.
The cap resistance is 4.48 K ohms.
1. Resistor cap
2. High-tension cable
Using a multimeter, check the resistance between
the high tension lead (spark plug cap removed) and
the primary side spade connector. Repeat the pro-
cedure for the other spark plug cable.
The resistance should be 12 ± 3.6 K
Ω
at 20°C.
NOTE:
A short circuit will read 0 ohm (or close to)
on ohmmeter.
DYNAMIC TEST
All Models
Use an ignition coil tester, available from after-
market tool/equipment suppliers.
CAUTION:
Do NOT use coil tester on metal work
bench. Follow manufacturer instructions.
1. With ignition coil removed from craft, discon-
nect spark plug caps from high tension cables.
2. Hook high tension leads from tester to ignition
coil high tension cables.
3. Connect 2 smaller tester leads to primary of ig-
nition coil.
TYPICAL
1. Leads to secondary
2. Leads to primary
4. Turn power switch to 12 volts and you should
observe spark jumping at a predetermined gap
of 7 to 8 mm (.276 to .311 in).
If there is no spark, if it is weak or intermittent, the
coil is defective and should be replaced.
SPARK PLUGS
Disassembly
First unscrew the spark plug one turn.
Clean the spark plug and cylinder head with pres-
surize air then completely unscrew.
Heat Range
The proper heat range of the spark plugs is deter-
mined by the spark plugs ability to dissipate the
heat generated by combustion.
The longer the heat path between the electrode
tip to the plug shell, the hotter the spark plug op-
erating temperature will be — and inversely, the
shorter the heat path, the colder the operating
temperature will be.
A “cold” type plug has a relatively short insulator
nose and transfers heat very rapidly into the cylin-
der head.
F08H0EA
A00E0QA
1
2
F00H14A
1
2
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Summary of Contents for GTI 5558
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