General Information - Facom X.730B Guía De Instrucciones

1. GENERAL INFORMATION

The timing light X.730 B can be used on 2 or
4 stroke petrol engines with up to 2 sparks
per revolution. Stroboscopic RPM and ad-
vance measurements are independent from
the number of cylinders and can be carried
out by connecting the inductive clamp to the
spark cable of the No.1 cylinder.
DC or peak voltages can be measured by
connecting the RED 1 clip to the test point.
Dwell of each distributors' camshafts can be
measured both in degrees or in percentage.
Injection time or duty cycle measurements
in milliseconds of injectors or other actuators
can be made by connecting the RED 1 CLIP
and the inductive clamp to the spark cable
of the relevant cylinder.
RPM measurements can be carried out
by the stroboscope, without contact and
without sticking any refl ecting tapes to the
rotating part.
2. CHECKS
It is possible to diagnose faults and wears
without disassembling the part concerned:
1 - in the contact breaker system;
2- in the centrifugal advance mechanism;
3 - in the timing system;
4 - in the vacuum advance system;
5 - in the vacuum retard system;
6 - in the battery and charging system.
A check and a correct adjusting of the diffe-
rent parts described above allow to optimize
the engine performance, reduce wears, fuel
consumption and harmful gas emissions.
TECHNICAL FEATURES
READING
– RPM
– Stroboscopic advance
– DWELL (for each cylinder)
– DC Voltage
– Peak Voltage
– Stroboscopic RPM counter
– Memory of readings
– Power supply
3. PRECAUTIONS
In order to prolong the lifetime of the unit,
it is necessary to softly coil the cables but
never wrap them around the timing light.
4. OPERATING INSTRUCTIONS
• Connect the timing light as shown in Fig.
1.A reversed connection to battery of the
RED/BLACK clips does not cause damages
to the timing light.
Mount the clamp at about 10 cm from the
distributor, with the arrow pointing towards
the spark plug.
Make sure the cables are far from exhaust
pipes, rotating parts and high voltage leads.
• Check that the coil's electrical connections
are correct. Reversed connections can cause
reading unsteadiness and decrease the
engine performance.
• Check that the timing marks can be seen
clearly; bring otherwise the piston of the
No.1 cylinder at TDC in compression stroke,
and trace with a white chalk two signs in line
on the crankcase and the crankshaft pulley.
• By pressing the D key, the strobe light
should fl ash regularly; an irregular fl ashing
could be caused by :
- non-resistive spark cables;
- discharges between cap poles or to ground
due to dirt or moisture;
- leakage to ground or between cables due
to ageing or cracks in the insulating sheath;
- wear or excessive gap between rotor arm
and poles or cap's central contact;
- too small spark gap or spark electrodes
with too much carbon residues;
SCALE
400÷19.999 rpm
0÷78°/90° (400/465 rpm)
0÷ 65 ms
0÷100%
0÷120° (> 600 rpm)
1÷70 Volts
1÷70 Volts
60÷6000 rpm
6 s (from key D release)
9.5÷15 Volts (9.5÷35 V optional)
RESOLUTION
1 rpm
0.1°
0.1 ms
0.1%
0.1°
0.1 Volt
0.1 Volt
1 rpm
5
- too low voltage on the spark plug due to
faults in the ignition system;
- timing light too near to spark cables,
distributor or ignition coil.
• Check against the light that the clamp's
cores match completely. With a cloth,
remove possible grease and dust.
5. CHECKING THE DWELL ANGLE
• Start the engine and make it warm till
reaching a regular rotation at idle.
• Disconnect the vacuum tube, if specifi ed
in the data manual.
• In breaker points or transistorized ignition
systems, the Dwell angle is checked by
connecting the RED 1 clip to coil negative.
• In some transistorized systems, a zero
reading means an interrupted reluctor or
wiring. If the reading is very different from
3÷5 ms, the causes can be: a wrong distance
between poles and reluctor, a faulty module
or a resistance of the ground connection
higher than 0.1 Ohm.
Check the ECU, in case it should directly
drive the ignition coil.
• In case of breaker points systems follow
the instructions page 7 to check that the
measurement in degrees or percentage
corresponds to the manufacturer's data.
Readings out of tolerance can be due to:
wrong distance between contacts, damages
to the base plate or the contacts, worn
camshaft and distributor shaft .
• Bring the engine to 2000 RPM, variation
should not be more than 3 degrees (some
distributors have higher variations, it is
therefore necessary to check the features
declared by the manufacturer before
changing it).
Higher variations can be due to the same
causes described in the previous chapter,
loose contacts, used contacts' pivot.
In case of an excessive variation when
connecting the vacuum tube, the pivot post
of the base plate could be damaged.
EN