SCREEN GP-MAGNETIC 3487792 - Caterpillar

General Information
For Specifications with illustrations, make reference to Specifications For 3100 HEUI Diesel Truck Engine. If the Specifications are not the same as in the Systems Operation, Testing and Adjusting, look at the printing date on the back cover of each book. Use the Specifications given in the book with the latest date.The 3100 HEUI engines are in-line six cylinder arrangements, with a firing order of 1, 5, 3, 6, 2, 4,. The engine rotation is counterclockwise as viewed from the flywheel. The engines series are turbocharged and air-to-air aftercooled. The 3100 HEUI engines have a bore size of 105 mm (4.1 in) and a stroke of 127 mm (5.0 in) in a displacement of 6.6 liters (403 cubic inches) or a bore size of 110 mm (4.3 in) and a stroke of 127 mm (5.0 in) in a displacement of 7.25 liters (442 cubic inches).The hydraulic electronic unit injector system eliminates many of the mechanical components of a "pump-and-line" system. It also provides increased control of timing and fuel/air ratio. Timing advance is achieved by precise control of unit injector timing. Engine rpm is controlled by adjusting the injection duration. A special pulse wheel provides information to the electronic control module for detection of cylinder position and engine rpm.The engine has built-in diagnostics to insure that all components are operating properly. In the event of a system component failure, the operator will be alerted to the condition via the dashboard mounted "check engine" light. An electronic service tool can be used to read the numerical code of the faulty component or condition, or the cruise control switches can be used to "flash" the code on the dash mounted "check engine" light. Intermittent faults are "logged" and stored in memory.Starting The Engine
The 3100 HEUI Diesel Truck Engine's ECM will automatically provide the correct amount of fuel to start the engine. DO NOT HOLD THE THROTTLE DOWN while cranking the engine. If the engine fails to start in twenty seconds, release the starter switch. Allow the starter motor to cool for two minutes before using it again.
Excessive ether (starting fluid) can cause piston and ring damage. Use ether for cold weather starting purposes only.
Cold Mode Operation
If the sum of coolant temperature and inlet air temperature is less than 35°C (95°F), the ECM will set cold start conditions; low idle rpm will be increased to 1000 rpm, and engine power will be limited. Cold mode will be de-activated when the above temperature condition is met, or after twelve minutes of running. It can also be disabled by depressing the service brake or by placing an automatic transmission in gear from neutral/park. Cold mode may ramp slowly back to 1000 rpm after disabling, if the temperature conditions still exist (and an automatic transmission is not in gear). Cold Mode also varies fuel injection amount and timing for white smoke control. The time needed for the engine to reach the normal operating temperature is usually less than the time taken for a