1998 OPEL FRONTERA engine

6D – 18 ENGINE ELECTRICAL
DISASSEMBLY
1. Remove the through bolt.
Insert the tip of a pry bar into the gaps between the
front cover and the stator core.
Pry apart and separate the front cover, rotor, the
rear cover and stator.
NOTE: Take care not to scratch or otherwise damage
the stator coil with pry bar.
2. Clamp the rotor in a vise and then remove the nut
and pulley.
3. Remove the rotor assembly from front cover.4. Remove screws with bearing retainer from front
cover and remove bearing.
5. Remove the mounting nuts holding the “B ”
terminal, the diode, and the brush holder.
6. Separate the rear cover from the stator.
F06RT021
F06RT022
F06RT023
F06RT024

ENGINE ELECTRICAL 6D – 19
7. Remove bolts which secure stator terminal to
rectifier terminal, and remove stator.
8. Remove Bolts which secure regulator, rectifier and
brush-holder, and separate these parts.
NOTE: Do not apply a shock or load to regulator,
rectifier and brush holder.INSPECTION AND REPAIR
Repair or replace necessary parts if extreme wear or
damage is found during inspection.
Rotor Assembly
1. Check the face of the slip rings for contamination
and roughness. If found to be scored, dress with a
fine sandpaper (#500 – 600). If found to be
contaminated, clean with a cloth saturated with
alcohol.
2. Measure the outside diameter of the slip rings.
Standard: 27 mm (1.06 in)
Limit: 26 mm (1.02 in)
3. Check resistance between slip rings, and replace if
there is no continuity.
Standard: 3.75
or less
066RS030
066RW025
066RS032
066RS033

6D – 20 ENGINE ELECTRICAL
4. Check for continuity between slip ring and rotor
core.
In case of continuity, replace the rotor assembly.
Stator Coil
1. Check for continuity across the stator coils. If no
continuity exists, replace the coils.
Resistance value at 20°C
Standard: Approx 0.07
2. Check for continuity across one of the stator coils
and stator core. If a continuity exists, replace the
coil.
Standard: More than 1M
Brush
Measure the brush length.
If more than limit, replace the brush.
Standard: 18.0 mm (0.709 in)
Limit: 5.5 mm (0.217 in)
＋
−
066RS017
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066RW024066RS034

ENGINE ELECTRICAL 6D – 21
Rectifier Assembly
1. Measure the resistance between each diode
terminal and aluminum diode fin in forward and
reverse directions with the connection of the tester
leads switched. The diodes are normal if resistance
is nearly zero ohms in one direction and is infinitely
high in the other direction.
2. If a diode has no resistance or equal resistance in
both directions, it is defective and should be
replaced together with the holder.
IC Regulator Assembly
Connect a variable resistor, two 12V batteries, a fixed
resistor, and a voltmeter to the IC regulator as shown in
illustration.
a. Measuring equipment specifications
1. Fixed resistor (R1) : 10 Ohms / 3W
2. Variable resistor (Rv) : 0 – 300 Ohms / 12W
3. Batteries (BAT1, BAT2) : 12V (2 Batteries)
4. DC voltmeter : 0 – 50V / 0.5 steps (4 Check points)
b. Measuring procedure
1. Measure the voltage “V1” across the first battery
(BAT1). If the reading is between 10 and 13 volts,
the battery is normal.
2. Measure the voltage “V3” across both the batteries
(BAT1, BAT2). If the reading is between 20 and 26
bolts, the batteries are normal.
3. Gradually increase the resistance of the variable
resistor from zero. Measure the voltage “V2” (the
voltage across the F and E terminals).
Check to see that the voltage across “V1” changes
at this time. If there is no change, the voltage
regulator is faulty and must be replaced.
4. Measure the voltage at “V4” (the voltage across the
variable resistor center tap and terminal E with the
variable resistor resistance held constant). The
measure voltage should be within the specified
(14.4 ± 0.3 volts) limits. If it is not, the regulator
must be replaced.
Reassembly
To reassemble, follow the disassembly steps in the
reverse order, noting the following points:
NOTE:
1) Never make battery connections with polarities
reversed, or battery will be shorted via the diodes.
This will cause damage to the diodes.
2) Do not connect generator B terminal to ground; it is
connected directly to the battery.
This cable will burn if it is connected to ground.
3) Make sure to disconnect the positive (+) terminal of
the battery when quick-charging battery.
Diodes may be damaged due to abnormal pulse
voltage generated by the quick charger.
4) When reassembling the front section to rear
section, insert a stiff wire into hole in the rear face
of the rear cover from the outboard side to support
the brush in raised position, then insert the front
section to which rotor is assembled.
5) Reassemble parts carefully to be sure they fit into
their original position, paying attention to the
insulated portions.
6) Wipe insulating tubes, washers and plates clean
and install them in position carefully to avoid getting
oil or grease on them.
066RS036
R
EBS
R1RV
BAT2 BAT1
V2V3
V4V1＋
−
＋
−
066RW029

6D – 22 ENGINE ELECTRICAL
1. Using a press with a socket wrench attached,
reassemble rotor and rear end cover assembly in
the front cover.2. Install pulley on the rotor.
Secure the pulley directly in the vise between two
copper plates, and tighten nut to the specified
torque.
Torque: 111 Nꞏm (82 lb ft)
066RS022
066RS010
MAIN DATA AND SPECIFICATIONS
General Specifications
Model LR190-750B LR-1100-731
Battery voltage V 12
Rated output A 90 100
Direction of rotation Clockwise
(as viewed from pulley side)
Rated rotation speed rpm 5,000
Maximum speed rpm 18,000

ENGINE ELECTRICAL 6D – 23
QOS4 PREHEATING SYSTEM
GENERAL DESCRIPTION
QOS4 preheating system features a quick-on glow plug
with thermometer control of the glowing time and the
afterglow time function.
The system consists of the ECM, indicator lamp, ECT
sensor, vehicle speed sensor, relay and temperature
self-control type glow plugs.With the employment of the ECT sensor, the glow time
changes according to the engine coolant temperature,
thus allowing optimum starting conditions to be
obtained.
The after glow time function is controlled by ECM.
NOTE:
Refer to DTC P0380 and P0381 of 6E section.
SYSTEM DIAGRAM
+
-KEY
50A
ECM
50A
GLOW
50A
2
WHT/
RED
0.5
BLK/
BLU
ECM J1-15 3
WHT/
RED
3
RED/
BLKMAIN
80A
8BLK/RED
Glow
Relay
GLOW PLUG 4
BATTHeater & A/C
Relay
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6D – 24 ENGINE ELECTRICAL
1 Inspection on Quick Heating Operation
1. Disconnect ECT-sensor connection on the
thermostat housing
Legend
(1) ECT Sensor
(2) EVRV
2. Connect the circuit tester between glow plug and
engine earth.
3. Inspect the following items with starter switch set to
ON position (but do not start the engine).
1) The glow indicator shall light for about 5 sec.
2) The circuit tester shall indicate power supply
voltage for 180 sec.
If above specifications are not satisfied, inspect
wire harness, glow relay and ECT-sensor. If
satisfied, inspect glow plug.2 Inspection on Afterglow Operation
1. Disconnect ECT-sensor connection on the
thermostat housing
Legend
(1) ECT Sensor
(2) EVRV
2. Connect the circuit tester between glow plug and
engine earth.
3. Inspect the following item with the engine started.
1) The circuit tester shall indicate about 12 volts
after 180 seconds of engine start.
If above specifications are not satisfied, inspect
battery voltage, engine earth, wiring harness,
glow plug, and ECM.
12
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065RW035
12
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065RW035
INSPECTION ON QOS4 SYSTEM OPERATION

ENGINE ELECTRICAL 6D – 25
ECT SENSOR
Measure the resistance depending on the water
temperature.
Temperature (°C) Current (mA) Resistance (k
)
20 ± 1 1.0 2.0 – 3.0
50 ± 1 1.0 0.6 – 1.0
When installing the ECT sensor, apply sealant (Loctite
#262 or equivalent) to prevent water leakage.
Torque: 8 Nꞏm (0.8 kgꞏm/69 lb in)
Legend
(1) Sealing Material
GLOW PLUG
Inspect the resistance
Resistance at normal temperature: 0.8 – 1.0
Torque: 23 Nꞏm (2.3 kgꞏm/17 lbꞏft)
GLOW PLUG RELAY
Inspect the continuity
(2) – (4) No Continuity
(1) – (3) Continuity
If battery voltage is applied to the terminal between (1)
– (3)
(2) – (4) Continuity065RW058
065RW061
1
065RW060
2 42
311
34
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