Table of Contents
Advertisement
,
to) L;onnect [ne analyzer to the vehicle as shown in
Figures 1 and 4.
(c) Function Selector - Dwell/Points
(d) Range Selector - Points/Low Volts
NOTE
When testing a vehicle with dual points, alternately
block one set of points open with a piece of insulating
material while the other set is being tested.
(e) Turn the ignition key to the ON position. If the
meter reads OPEN on the points scale, crank the
engine a fraction of a revolution at a time until
the meter reads in the left hand area of the scale.
(f) The points are now closed.
A reading in the OK zone of the points scale indJ*
cares that the breaker points and associated
wiring are in good condition. The Analyzer may
indicate high point resistance on a new set of
points until they have been run tn the vehicle for
a few miles and have been properly seated. This
condition may be ignored as long as any defects
discovered during the previous visual check have
been corrected.
(g) A reading in the BAD zone of the points scale may
indicate defective points or any of the following
faults may exist:
• Poor distributor ground
• Poor connection on the primary lead from the
distributor to the ignition coil
= Defective distributor pigtail lead
= Misaligned points
• Poor points/plate ground inside distributor
Correct the defect and repeat the test,
Dwell Test And Adjustment (Breaker Point Systems
Only or Transistorized
Systems which Use Breaker
Points).
Before performing the DWELL TEST AND ADJUST-
MENT PROCEDURE, read the vehicle emission con-
trol label or the vehicle service manual to determine
what should be done with the vacuum hoses con-
nected to the distributor
and the various advance/
retard solenoids. Most often, the vacuum hose must
be disconnected
from the distributor
and the end
plugged with a plastic golf "tee" or other plug.
(a) Connect the analyzer to the vehicle as shown in
Figures 1 and 4.
(b) Function Selector - Dwell/Points
(c) Range Selector - Dwell
(d) Start the engine and allow it to warm up (upper
radiator hose hot),
Operate the #ngine at curb idle OR the RPM
specified by the vehicle emission control label or
the vehicle service manual for measuring dwell.
Check the RPM by switching
the FUNCTION
SELECTOR to, the appropriate RPM position to
match the vehicle engine under test, Return the
Function
Selector to Dwell and observe the
correct dwell scale.
(e) It dwelt is within specification no adjustment is
necessary.
,,
........
,,
NOTE
There is a direct relationship between dwell end timing.
However, it is onlya one way relationship.If you change
the dwell angle of the breaker points, you will auto-
matically change the ignition timing. Changing the
timing, though, has no effect on the dwell angle. FOR
THIS REASON, IT tS IMPORTANT TO RE-CHECK
THE TIMING WHENEVER THE DWELL ANGLE HAS
BEEN ADJUSTED.
DWELL ADJUSTMENT -
CONVENTIONAL BREAKER POINT SYSTEMS
On GM distributors with a small metal slide cover, lift the
cover and insert a W' Allen wrench in the adjusting screw
socket and adjust the dwell by turning the wrench, as
shown in Figure 14.
i
....
,,,,,
,
WINDOW
I18" ALLEN
WRENCH
., Ii
ADJUSTMENT
SCREW
TYPICAL GENERAL
MOTORS
BREAKER-POINTS
DISTRIBUTOR
FIGURE
!4
On Ford, Chrysler, American Motors and other distributors
not equipped with a small metal access slide cover, per-
form the following steps while referring to Figure 15,
1.
Remove coi! wire from center tower of distributor cap
and ground the wire bY connecting the loose end to
the engine or frame.
2.
Remove the distributor cap and rotor.
3.
Connect a remote starter switch to the vehicle or have
an assistant crank the engine for you,
4.
With ignition switch ON and engine cranking observe
reading on the Dwell scale.
5.
To adjust Dwelt, loosen the locking screw slightlyand
adjust the point gap with a feeler gauge according to
the procedure outlined in the vehicle service manual.
After adjustment, tighten lOcking screw, and recheck
dwell while cranking engine. Repeat procedure
if
necessary. (Figure 15),
Hide quick links:
Advertisement
Table of Contents
