Equus 3568 - INNOVA Digital Timing Light - Manual (Page 7)

As a minimum, make the following prepar-
ations before timing:
1. Locate the timing mark and reference
pointer. The timing mark and pointer are
usually located on the crankshaft pulley or
vibration damper (on the front of the engine)
or on the flywheel (between the engine and
transmission). Refer to Figure 2.
Make sure the timing mark and pointer are
clean and clearly visible. Chalk the marks
if necessary.
2. Make sure all spark plugs are in good
condition and are properly gapped.
3. Start and run the engine until it reaches
it's normal operating temperature. TURN
THE ENGINE OFF BEFORE CON-
NECTING TIMING LIGHT.
If applicable, check and adjust dwell to
manufacturer's specifications.
TIMING LIGHT CONNECTION
To ensure personal safety and reliable
operation of the timing light, use the following
procedure to connect the timing light:
1. Turn the ignition off. DO NOT CONNECT
THE TIMING LIGHT WITH THE ENGINE
RUNNING OR WITH THE IGNITION ON.
2. Clamp the inductive pickup clip around the
No. 1 spark plug wire. See Figure 3.
DO NOT ALLOW THE INDUCTIVE
PICKUP CLIP TO CONTACT THE
EXHAUST MANIFOLD OR OTHER
ENGINE PARTS. These parts become
EXTREMELY hot while the engine is
running, and will damage the inductive
pickup clip.
3. Connect the battery clips to the vehicle's
battery:
■ Connect the RED battery clip to
positive (+) battery terminal.
■ Connect the BLACK battery clip to
negative (-) battery terminal.
4. Connect the inductive pickup leads to the
bottom of the timing light handle.
INITIAL (BASE) TIMING CHECK
1. MAKE SURE the timing light is properly
connected as described in TIMING LIGHT
CONNECTION.
2. MAKE SURE the engine has been
properly prepared for the timing check as
described in ENGINE PREPARATION
BEFORE TIMING.
5
14 BTDC
10
6
0 TDC
6 ATDC
0 10 20 30
20
16
12
8
4
0
0 4 8 12 16
10 10 T
BTDC ATDC
T
10
20
BTDC
Fig. 2 Typical Timing Marks WARNING!
Always keep hands, timing light, lead
wires and clips away from moving engine
parts and hot surfaces. DO NOT SMOKE.
NOTE
Some ignition systems require that certain
components be disconnected, jumped or
grounded BEFORE ignition timing can be
checked or adjusted to specifications. If
these procedures are not followed, the
checked or adjusted timing will not be
correct. You MUST consult your vehicle's
service manual for the proper procedures
and specifications.