
Ignition distributor
is of 3810.3706 model, four-event
sparking rate, non-shielded, with vacuum and centrifugal
advance units, with built-in Hall sender.
Spark control module
is of 3620.373 model, or 76.3734, or
RT1903, or PZE4022, or ä563.3747 model. The module process-
es the control output pulses from the Hall sender into current
pulses for the ignition coil primary winding.
Ignition coil
is of 8352.12, or 27.3705, or 027.3705, or
27.3705-01 model, oil-filled, sealed, open-loop magnetic circuit.
Spark plugs
are of Ä17ÑÇêå model, or Ä17ÑÇêå1 model
with suppressant chokes.
Ignition switch
is of 2101-3704000-11 model, theft-deterrent.
Fault diagnosis
Engine will not start
1. Hall sender pulses fail to reach
control module:
- broken circuit between sender
and control module;
- Hall sensor faulty
2. No pulses to primary winding:
- broken circuit between control
module and solenoid or control
module and ignition coil;
- control module faulty;
- ignition switch or ignition relay
failed
3. No HT to spark plugs:
- HT lead ends loose, broken off or
oxidized; leads dirty or insulation
damaged;
- carbon brush worn or damaged,
or has no contact with rotor arm;
- tracking through cracks or burns
in distributor cap or rotor, through
damp or foul distributor cap inside;
- distributor rotor resistor blown;
- ignition coil damaged
4. Oily spark plugs or wrong elec-
trode gap
5. Spark plug damaged (perished
insulation)
6. Wrong HT leads connection to
distributor cap terminals
7. Wrong ignition timing
Engine operates erratically or stalls at idle
1. Ignition timing too advanced
2. Electrode gap excessive
Engine running unstable or irregular at high crankshaft speeds
Weak weight springs in ignition
distributor
150
1. Carry out the following:
- check wiring and connections,
renew damaged wires;
- check Hall sensor using adapter
and voltmeter; renew failed sensor
2. Carry out the following:
- check wires and connections;
renew damaged wires;
Renew springs, run functional
bench test of centrifugal unit
Cause
Remedy
- check control module with oscillo-
scope; renew faulty control module
- check, renew faulty contact unit of
ignition switch or ignition relay
3. Carry out the following:
- check and restore connections,
clean or renew leads;
- check and when necessary renew
carbon brush;
- check, clean cap from moisture
and carbon deposits, renew cap
and rotor in case of cracks;
- renew resistor;
- renew ignition coil
4. Clean and regap spark plugs
5. Renew spark plugs
6. Reconnect leads as per firing
order 1-3-4-2
7. Check and adjust ignition timing
1. Check, adjust ignition timing
2. Check, adjust electrode gap
Fig.7-16. Exploded view of starter motor:
1 - drive end housing with intermediate ring; 2 - rubber plug; 3 - operating lever; 4 - solenoid; 5 - commutator end housing; 6 - brush; 7 - brush spring; 8 - protective case;
9 - stop ring; 10 - adjusting shim; 11 - yoke; 12 - clamp bolt; 13 - armature; 14 - insulating pipe; 15 - overrun clutch with pinion; 16 - stop collar
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