Cadillac 60 Series 1963 Shop Manual page 298

ELECTRICAL SYSTEM
12-17
Wires in Sockets lead to
Cylinder numbers Designated
Firing Order
1-8-7-2-6-5-4-3
Contact Points to
No. 1 Spark Plug
--Direction
of rotation
\
Rotate distributor
housing until
scribe mark is
opposite " 5 " line
Disconnect vacuum
advance pipe hose
when checking timing
Fig. 12-21 Ignition Adjustments
4. Connect distributor primary lead.
5. Install distributor cap.
6. Set timing, Note 23.
7. Connect vacuum advance pipe hose to vacuum
advance unit.
23. Ignition Timing Adjustment
1. Adjust distributor clamp nut to allow distribu-
tor to be turned by hand, but without excessive
looseness.
2. Disconnect vacuum advance pipe hose at dis-
tributor and place a piece of tape over end of hose.
(This is important, as a manifold leak will affect
timing adjustments.)
3. Insert an adapter pin alongside No. 1 or No.
6 ignition wire in distributor cap, if spark plug
connectors are not available.
4. Connect a suitable timing light to adapter or
connector.
NOTE: Make sure that timing marks and
scribe marks are clean.
5. Start engine and warm to operating tempera-
ture. Set idle speed at 480 rpm.
6. Observe timing light flashes on harmonic bal-
ancer in relation to degree marks on front cover
and rotate distributor so that light flashes when
scribe mark and " 5 " mark are aligned. The " 5 "
mark is five degrees ahead of top dead center,
Fig. 12-21.
Fig. 12-22 Secondary Efficiency Test
7. Tighten clamp nut to 18 foot-pounds, and re-
check timing to make sure that it did not change.
8. Remove tape from vacuum advance pipe hose
and connect hose to distributor.
24. Secondary Efficiency Test
This test provides an overall indication of the
performance of the entire ignition system.
1. Turn coil tester selector switch to secondary
efficiency position.
2. Connect a tachometer in system.
3. Start engine and set speed at 1,000 rpm.
4. Ground red (positive) lead of Coil Tester,
Fig. 12-22.
5. Connect black lead to each spark plug in turn,
and note reading on secondary efficiency scale of
Coil Test Meter.
6. Readings should be even and in the good band
at all plugs.
Secondary efficiency test indications are as
follows:
a. Reverse meter reading (off scale to left with
leads connected as in Steps 4 and 5) indicates coil
of wrong polarity; primary wires reversed at coil;
or battery connected backwards.
b. Uneven readings at plugs indicates defective
spark plug cables or connections, corroded dis-
tributor cap towers, uneven spark plug gaps, a
"cocked" distributor cap, uneven compression or
faulty spark plugs.