Subaru XT 1988 Service Manual page 1206

ENGINE ELECTRICAL SYSTEM
6-1
DISASSEMBLY
1)
Detach cap and dust cover as a unit.
2)
Remove carbon point from cap.
3) Remove rotor head securing screw and detach rotor head
from rotor shaft.
4)
Remove O-ring from housing.
5)
Drive roll pin out of shaft and pinion.
6) Remove pinion from shaft.
Further disassembly of parts is prohibited.
INSPECTION
1)
Carbon point
Ignition Coil
The E12·113 ignition coil is equipped with a power transistor
igniter. The power transistor amplifies the ignition signal
transmitted from the MPF I control unit. The amplified signal
is used to make and break the current flowing through the
primary winding of the ignition coil.
REMOVAL AND INSTALLATION
1) Disconnect battery negativ.e (-) terminals.
2) Disconnect wires from ignition coil.
3)
Remove ignition coil.
4)
To install, reverse the order of removal.
Measure the length of carbon point in cap. Replace if it is less
Be sure to connect wires to their proper positions. Failure to
than service limit.
do so will damage unit.
Standard length:
12 mm (0.47 in)
Service limit:
10 mm (0.39 in)
2) Cap and rotor head
Measure insulation resistance using a megger. Replace if it is
less than the specified value.
Insulation resistance:
More than 50 MQ
ASSEMBLY
ASSY is in the reverse order of disassembly. Observe the
following:
1) Use new roll pin when installing pinion.
2) Install pinion so that its alignment mark is aligned with
the mark on the housing when the cutout section of rotor
shaft faces the 1 st cylinder mark on the cap.
L6-080
Fig.
62
25
INSPECTION
Using accurate tester, inspect the following items, and replace
if defective.
1) Primary resistance
2) Secondary coil resistance
If the resistance is extremely low, this indicates the presence
of a short·circuit.
3) Insulation between primary terminal and case: 10 MQ or
more.
4) If engine does not run due to faulty ignition system,
check ignition system as follows:
Check for cracked distributor rotor or cap and corroded
terminals.
Visually inspect high tension wire for condition. Check spark
plugs and adjust gaps as necessary. Replace spark plug which
is not suitable for further use.
If the above checks cannot correct the problem, check entire
ignition system with oscilloscope or circuit tester in accord-
ance with the troubleshooting charts. (See chapter 6-3)
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