19 Product Information Section Model Views For more information on electronic engine features, refer to the Operation and Maintenance Manual, “Engine Features and Controls” topic (Operation Section). Additional Features The following additional features provide increased engine fuel economy and serviceability: Cold starting capability Tampering detection Diagnostics g00609479 Illustration 17 Cylinder and valve location (A) Exhaust valve (B) Inlet valve Hydraulic Electronic Unit Injectors Table 1 Hydraulically Actuated Electronic Unit Injectors (HEUI) perform the following functions: Pump the fuel. Meter the fuel. Time the fuel injection.
The unit injectors are controlled by the ECM which uses the camshaft position and the engine speed signals from the engine speed/timing sensors and the inlet air pressure sensors. The engine’s rated rpm is identified on the Information Plate. Engine Diagnostics The engine has built-in diagnostics in order to ensure that all of the components are functioning properly. In the event of a deviation from the programmed limits, the operator will be alerted to the condition by a “DIAGNOSTIC” lamp that is mounted on the dashboard. Under certain conditions, the engine horsepower and the vehicle speed may be limited. A Caterpillar electronic service tool may be used to display the diagnostic code.
(1) Air-to-air aftercooled Electronic Engine Features The Caterpillar C-9 Engine is designed for electronic controls. The integral on board computer controls the operation of the engine. Current operating conditions are monitored. The Electronic Control Module (ECM) controls the response of the engine to these conditions and to the demands of the operator. These conditions and operator demands determine the precise control of fuel injection by the ECM. The electronic engine control system provides the following features: There are three types of diagnostic codes: active, logged, and event. Most of the diagnostic codes are logged and stored in the ECM.
For additional information, refer to the Operation and Maintenance Manual, “Engine Diagnostics” topic (Operation Section). Engine speed governor Automatic air/fuel ratio control Torque rise shaping The ECM provides an electronic governor that controls the injector output in order to maintain the desired engine rpm. The functionality of electronic governor is similar to the Caterpillar mechanical governor, but the electronic governor includes additional features.
Injection timing control System diagnostics C-9 Engine Specifications Arrangement and Cylinders In-Line 6 cylinder Bore 112.0 mm (4.41 inch) Stroke 149.0 mm (5.87 inch) Aspiration ATAAC(1) Displacement 8.8 L (537 in3) Firing Order 1-5-3-6-2-4 Rotation (flywheel end) Counterclockwise Valve Lash (inlet) 0.38 mm (0.015 inch) Valve Lash (exhaust) 0.64 mm (0.025 inch)