Toyota 4-Runner 1985 Repair Manual page 294

IGNITION SYSTEM - On-Vehicle Inspection IG-9
Signal Rotor
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ON-VEHICLE INSPECTION OF DISTRIBUTOR
1.
2.
CHECK AIR GAP
(a) Using a feeler gauge, measure the gap between the
signal rotor and the pickup coil projection.
Air gap: 0.2 - 0.4 mm (0.008 - 0.016 in.)
(b) Adjust the gap if necessary.
• Loosen the two screws and move the signal
generator until the gap is correct. Tighten the
screws and recheck the gap.
CHECK SIGNAL GENERATOR
Using an ohmmeter, check the resistance of the signal
generator.
Generator resistance: 140 - 1800
If the resistance is not correct, replace the signal generator.
3. CHECK VACUUM ADVANCE (FOR 22R)
(a) Disconnect the vacuum hose and connect a vacuum
pump to the diaphragms.
(b) Apply vacuum and check that the vacuum advance
moves.
If the vacuum advance does not work, repair or replace as
necessary.
4. CHECK GOVERNOR ADVANCE (FOR 22R)
(a) Turn the rotor shaft clockwise, release it and check
that the rotor returns slightly counterclockwise.
(b) Check that the rotor shaft is not excessively loose.