Vaz 21213, Руководство по ремонту, Страница: 154 / 222

- start the engine and point the flashing timing light at the tim-
ing mark on the pulley; when the ignition is correct, then at idling
speed the TDC mark on the flywheel should be as outlined in
Attachment 3.
To adjust the ignition timing, switch off the engine, slacken
the nuts securing the ignition distributor and turn the latter to the
angle desired (clockwise for advance and anticlockwise for retard
when viewed from the distributor cap end). Tighten the nuts and
recheck the ignition timing.
For easier ignition timing adjustment there provided the
respective graduations and (+)/(-) marks on the distributor flange.
A graduation on the distributor flange corresponds to eight
degrees (8°) of the crankshaft turn.
Another effective way for checking the ignition timing is to
use an oscilloscope analyzer, when this tool is available.
Refit the distributor as following:
- turn the crankshaft to the position of compression beginning
at No1 piston; then still turning the crankshaft, align mark 4 with
mark 1;
- remove the distributor cap, turn the rotor arm so that its
exterior contact faces the No1 piston contact on the distributor
cap;
- holding the distributor driveshaft stationary, insert it to the
cylinder block so that the axial line through the spring clamps is
nearly parallel to the engine axial line;
- locate the distributor to the cylinder block, refit the distribu-
tor cap, reconnect the wiring, check and adjust timing ignition.
Ignition components - bench testing
Ignition distributor
The distributor of 3810.3706 model is shown in Fig.7-19.
Functional test. Mount the distributor on the tester intended
for checking electrical devices. Connect it to a variable speed
motor.
Connect the distributor terminals to the ignition coil, spark con-
trol module and battery of the tester similar to the wiring in the vehi-
cle. Connect four terminals of the distributor cap to the spark box
with adjustable gaps.
Set the spark gap to 5 mm, switch on the tester motor and
operate the distributor driveshaft clockwise for some minutes at
2000 rpm. Increase the gap to 10 mm and check for internal dis-
charges in the distributor. These can be recognized by specific
sounds or weak or intermittent sparking in the tester spark box.
No noise should be produced by the ignition distributor at any
driveshaft speed.
Automatic ignition advance control.
Mount the ignition dis-
tributor on the tester and connect it to terminals 3, 5 and 6 of
tester control module 1 (Fig.7-20). Connect control module ter-
minal 4 to the tester «plus», while terminal 1 - to the tester
«breaker» terminal. Set the spark gap to 7 mm.
Switch on the tester motor and operate the distributor shaft at
500-600 rpm. On the tester graduated disc note the angle at
which one of the four sparkings occurs.
While increasing the speed in steps of 200-300 rpm and
watching the disc, determine the advance angle with respect to
the distributor shaft speed. Compare the resulting centrifugal
advance pattern to that in Fig. 7-21.
When the pattern differs from that shown in Fig.7-21, it can
be adjusted by bending the weight spring brackets of the cen-
trifugal advance unit. Bend the thinner spring bracket for speeds
152
Fig.7-19. Ignition distributor (3810.3706 model):
1 - shaft; 2 - oil screen collar; 3 - connector; 4 - vacuum advance housing; 5 -
diaphragm; 6 - vacuum advance cover; 7 - vacuum advance operating rod; 8 -
bearing plate, centrifugal advance unit; 9 - ignition distributor rotor; 10 - side
electrode and terminal; 11 - cover; 12 - centre electrode and terminal;
13 - centre electrode carbon brush; 14 - resistor; 15 - outside rotor contact
breaker point; 16 - centrifugal advance unit plate; 17 - weight; 18 - screen; 19 -
Hall sensor bearing plate; 20 - Hall sensor; 21 - ignition distributor body