Using Your Timing Light; Before You Begin; Engine Preparation Before Timing - Innova 3568 El Manual Del Propietario

BEFORE YOU BEGIN

Make a thorough check before starting any test procedure and fix any known mechanical prob-lems
before performing any test. Loose or dam-aged hoses, wiring, or electrical connectors are often
responsible for poor engine performance.
Refer to your vehicle's service manual for proper connection of vacuum hoses, electrical wiring, and
wiring harness connectors. Check the following areas:
■
All fluid levels
■
Spark plugs and spark plug wires
■
Air cleaner
■
Vacuum hoses
■
Belts
■
Electrical wiring
■
Electrical connectors

ENGINE PREPARATION BEFORE TIMING

Always prepare the engine for timing before performing a timing check. Refer to the Vehicle Emission
Control Label or service manual for timing procedures and specifications for your vehicle. The
Vehicle Emission Control Label is located under the hood in the engine compartment. The label is
typically located on the underside of the hood, on a fender well or valve cover, or near the hood latch.
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
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.

Using Your Timing Light

the engine and
Fig. 2 Typical Timing Marks
14 BTDC
10
6
0 10 20 30
0 TDC
6 ATDC
20
16
12
8
4
0
BTDC
T
10
0 4 8 12 16
ATDC
10
BTDC
5