Perkins 2506 Operation And Maintenance Manual page 20

20
Product Information Section
Engine Description
There is one unit injector per cylinder. Individual unit
injectors meter the fuel. The individual unit injectors
also pump the fuel. The metering and the pumping is
done under high pressure. High injection pressures
help to reduce fuel consumption and emissions. The
use of this type of unit injector provides total
electronic control of injection timing. The injection
timing varies with engine operating conditions. The
engine performance is optimized in the following
areas:
• Starting
• Emissions
• Noise
• Fuel consumption
The timing advance is achieved through precise
control of the injector firing. Engine speed is
controlled by adjusting the firing duration. The
information is provided to the Electronic Control
Module (ECM) by the crankshaft position sensor and
the camshaft position sensor. The information is for
detection of cylinder position and engine speed.
The engines have built-in diagnostics in order to
ensure that all of the components are functioning and
operating properly. In the event of a system
component deviation from the programmed limits, the
operator will be alerted to the condition by a
DIAGNOSTIC lamp that is mounted on the control
panel. An electronic service tool that is provided by
Perkins may be used to read the numerical code of
the diagnostic flash code. There are three types of
diagnostic codes: ACTIVE, LOGGED and EVENT.
These codes are logged and stored in the ECM.
Refer to Operation and Maintenance Manual,
"Engine Diagnostics" for additional information.
The cooling system consists of the following items: a
centrifugal pump that is driven by a gear, water
temperature regulator, an oil cooler and a radiator
that incorporates a shunt system.
The engine lubricating oil is supplied by a gear type
pump. The engine lubricating oil is cooled and
filtered. Bypass valves provide unrestricted flow of
lubrication oil to the engine parts when the oil
viscosity is high or if either the oil cooler or the oil
filter elements (paper cartridge) become plugged.
Engine efficiency, efficiency of emission controls, and
engine performance depend on adherence to proper
operation and maintenance recommendations. This
includes the use of recommended fuels, coolants and
lubrication oils.
Aftermarket Products and Perkins
Engines
When auxiliary devices, accessories, or
consumables (filters, additives, catalysts, etc) which
are made by other manufacturers are used on
Perkins products, the Perkins warranty is not affected
simply because of such use.
However, failures that result from the installation
or use of other manufacturers' devices,
accessories, or consumables are NOT Perkins
defects. Therefore, the defects are NOT covered
under the Perkins warranty.
SEBU8313-02