Caterpillar 3126 Service Manual

The Caterpillar 3126 HEUI engine introduces a new era of the diesel engine in the bus industry using the average diesel engine power. The base engine takes advantage of the best features of the 3116 and years of experience and combines this with an electronically controlled fuel system, a larger displacement, and other new features to produce the 3126. The fuel distribution system is completely controlled Control Module, hereinafter referred to as ECM. Effective delivery The fuel in the combustion chambers is achieved by the Hydraulic electronic unit injection system (HEUI), which will be Further discussed below. The ECM identifies short sensors / open or operating conditions Out of the normal range. It will warn the driver/mechanic The use of fault codes that are displayed on the dashboard. 

At this point, it should be noted that all subjects related to the operation And maintenance of the engine are covered in the 3100 HEUI Manual provided with the chassis manual. As a result, no attempt Is made here to cover repairs to the engine. Service and operation The instructions contained in the Caterpillar manuals must be followed. When you need information about the engine, contact your A dealer or a local distributor of Caterpillar, which is Capable of handling all engine service and warranty repairs. The operation and maintenance of 3126 engine-powered buses are encouraged to read and to Manual of use and maintenance Caterpillar at the earliest opportunity. Some operational characteristics need to be discussed With the bus operators to familiarize them with ECM controls various functions.

The ECM control its various functions by using the following sensors signals: actuation of injection pressure, pressure turbo boot, engine speed, delay of the motor, Temperature of coolant, Temperature of intake air, Position of the butterfly, the speed of the vehicle. ECM provides a fully electronic control the start and duration Fuel injection. The data provided by the sensors ECM control fuel injected into each cylinder, which optimizes The performance related to the normal temperature cold start, Global warming, emissions, noise, fuel economy and handling. The ECM controls the higher engine speed, which is 2640 set At the factory, by limiting the fuel to the injectors. The engine Doesn't have a mechanical Governor. 

The white smoke is reduced by controlling the injection time and delivery During operation cold and acceleration. The ECM uses Entry of the sensor to calculate the time and delivery that don't Produce smoke. The maximum speed of the road is predetermined by the owner. Time of writing specifications for the bus and is programmed in the ECM by the factory. When the programmed speed limit Is reached, the fuel injectors is limited and will remain limited Until the bus slows to a speed lower than the speed limit. Arrangements have been made in 3126 HEUI provided by Thomas to allow fuel to be progressively reduced to the maximum Speed is approached, or about 2.5 mph before. This Process called the flexible vehicles speed limits, prevent Reduction of the fuel at the higher limit.

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