Checking And Adjusting The Ignition Timing - Alfa Romeo 33 Workshop Manual

A very accurate check of the timing at
idle speed, has !to be performed very
carefully, Sin&e incorrect timing at idle
greatly affects exhaust emission level
which would not remain within the
s p e c i f i e d ,values.
For
ce" in the
For the
the following
1.
Connect tbe supply terminal of stro-
rating temperature.
Fixed advsnce
(1) The timlng values are to be measured wlth the vacuum advance hose disconnected
(2) The value is measured indipendently of the engine speed
,(A) For couniries where antipollution regulations are in force
(3) For an:addltional check, check for 30" at 4500 r.p.m.
O c t o b e r ,1988 ~
IGNITION, STARTING, CHARGING SYdTE'h
5. Disconnect the v,acuum advance ho-
se from distributor; with the strobo-
950 + 100
the marker on rear cqver is aligned
with notch I on flywheel of the engine.
the pro-
T T.D.C. of cylindèr No. 1.
II Advance at 5250 rpm.
se disconnected)
8. If specified alignment does npt,oc-
cur, proceed to adjust timing opera-
ting as followS:
(1) Unscrew the securing nut on th6 di-
stributor.
(2) Rotate the distributor body coun-
tercklockwise to advance, or clockwi-
se to retard the ignition setting.
(3) Retighten the distr/butor securing
nut.
(4) Check that timing is within speci-
fied values.
1200 305.85 1350-305.87
1350-305.86 1500
se to the distributor.
8. Using the $roboscopic gub, check
also that at engine rpm of
the marker of engine rear caver is ali-
ghed with notch
9. Remount the
rear caver.
For the
wing procedyre is to be followed:
1. Disconnect the minimum and maxj-
m u m a c c e l e r a t o r t h r o t t l e o p e n i n g
switch connecter and short-circuit the
three wiring side plus.
2. Disconnect vacuum pressure hose
the advance,value is 8". If this is not
the case, rotate the distributor.
N O T E :
Connecting to,ground those plus relative to
the minimum and maximum accelerator
tion advance value at 8" independently at
engine r.p.m.
305.88 1700-305.58
at 900 thru 1050 rpm'
5250 r.p.m.
II
on engine flywheel.
plastic
electronic injection 1.7 engine
the follo-
as to dotaln a fixed igni-
SO
1700-305.58
A
PA333500883301