Diesel Timing Light; Overview Of The 4-Stroke Diesel Combustion Cycle; Why Diesel Combustion Timing Is Important - BGS technic 40107 Manual De Instrucciones

DIESEL TIMING LIGHT

This Diesel Timing Light with diesel sensor works on most 12V and 24V diesel engine vehicles.
WARNING:
While working around injectors, make certain you should pay extreme attention. When the fuel is
injected into the cylinder, the pressure required is enough to inject the fuel under the skin and into the
blood stream. At that time if the fuel is injected onto people, this could result in serious injury.
Principle of the Diesel Timing Light:
This Diesel Timing Light is used with an aluminum piezoelectric device and a converter box via
pressure pulses detected and converted into electrical signals to trigger this Timing Light. While the
aluminum piezo clamp detects a pressure pulse in the diesel fuel injector pipe, will emit an electrical
signal to the converter box, and then the converter box will trigger this Timing Light. A technician can
use this helpful tool to read a diesel engine's timing and do any necessary adjustment.
For checking:
1. Injection pump timing under operating conditions without removing any components
2. Injection pump advance
3. Fuel pressure problems on distributor-type pumps
4. Engine RPM
5. Battery Voltage
Specifications:

Input power: 10V-30V DC

Trigger Point: 15% of the highest pressure in the Injector pipe

Size of Piezo Clamp: fits for 6mm-10mm (1/4"~3/8") of Injector Pipes

Maximum 2,000 RPM

Overview of the 4-Stroke Diesel Combustion Cycle

Intake: On early engines, during the intake stroke, the piston travels downward, drawing fuel/air
mixture into cylinder. On modern engines, it incorporates an extra cam/lifter arrangement as seen on
the exhaust valve which is held shut by a spring. During intake stroke, vehicle's fuel fills up the
combustion chamber.
Compression: While the piston rises and passes TDC, cylinder pressure increases and temperature
increases up to 500-800℃. The self-ignition temperature of diesel fuel is approx 400℃. Flywheel
momentum drives the piston upward, compressing the fuel/air mixture. This is to prepare it for ignition.
Power: After fuel injects into the cylinder, an explosion occurs because of the combination of heat and
atomized diesel fuel. This causes the piston to be forced downward which produces torque and the
horsepower required from a typical diesel engine.
Exhaust: At the bottom of the power stroke, the exhaust valve is opened by the cam/lifter mechanism.
The upward stroke of the piston drives the exhausted fuel out of the cylinder.

Why Diesel Combustion Timing is important?

Timing is critical to the optimal operation of the diesel engine. The fuel is required to be delivered only
after temperature has reached over the self-ignition temperature. The gas expansion should begin
only after the piston has passed TDC. If timing is set incorrectly, the engine will not perform efficiently.
Problems could occur if timing is set incorrectly.
Difficult starting hot or cold
Engine will not rev or is slow to rev up
Hesitation/stalling/ will not rev in very cold conditions
Shaky idle
Excessive fuel consumption
SW-Stahl und Werkzeugvertriebs GmbH
L e v e k r u s r e t S a r s s e 6 5
D 4 - 2 8 9 7 R e m s c h e d i
- 10 -
Black exhaust smoke
Gray / white exhaust smoke
Misfiring
Abnormal knocking from engine
Engine overheating
Insufficient power
Tel. +49 (0) 2191 / 46438-0
F ax +49 (0) 2191 / 46438-40
- E M a : l i n i o f @ s w s a t l h d . e