Manual de servicio

Caterpillar 3126B HEUI Engines Service Manual PDF

Caterpillar 3126B HEUI Engines Service Manual. The Caterpillar 3126B HEUI Engine introduces a new era of the diesel engine in the bus industry using the medium duty diesel engine. The basic engine takes advantage of the 3116′s best features and years of experience and combines this with an electronically controlled fuel system, larger displacement, and other new features to produce the 3126B. The fuel delivery system is controlled entirely by the Electronic Control Module, hereafter called the ECM. The actual delivery of the fuel into the combustion chambers is accomplished by the Hydraulic Electronic Unit Injector system (HEUI), which will be discussed later. The ECM will identify short/open sensors or operating conditions out of the normal range. It will alert the driver/mechanic through the use of failure codes that are displayed on the dash. At this point be advised that all subjects related to the operation and maintenance of the engine are covered in the 3100 HEUI manual provided with the chassis manual. Therefore no attempt is made herein to cover engine repairs. Service and operating instructions found in the Caterpillar manuals should be followed. When in need of information concerning the engine, contact your local Caterpillar dealer or distributor who is fully qualified and capable of handling all engine warranty and service repairs. The ECM controls its various functions through signals from the
following sensors:
Injection Actuation Pressure
Turbo Boost Pressure
Engine Speed
Engine Timing
Coolant Temperature
Air Intake Temperature
Throttle Position
Vehicle Speed
The ECM provides total electronic control of the start and duration of fuel injection. Data furnished by the sensors enable the ECM to control the fuel injected into each cylinder, which optimizes performance related to Normal and Cold weather starting, warm up, emissions, noise, fuel economy, and driveability. Top Engine Limit The ECM controls the top rpm of the engine, which is 2640 set at the factory, by limiting the fuel to the injectors. The engine does not have a mechanical governor. Start-Up and Emission Control White smoke is reduced by controlling injection timing and delivery during cold operation and acceleration. The ECM uses various sensor inputs to calculate timing and delivery that will not produce smoke.

Download: Caterpillar 3126B HEUI Engines Service Manual