C7 Industrial Engines Systems Operation – General Information

Right side view

(1) Lifting eye

(2) Water drain plug

(3) Exhaust manifold

(4) Turbocharger

(5) Alternator

(6) Orifice for bleeding the wastegate (if equipped)

(7) Oil filter

(8) Water pump

(9) Crankshaft vibration damper

Left side view

(10) Fuel filter

(11) Unit injector hydraulic pump

(12) Engine crankcase breather

(13) Inlet elbow

(14) Air inlet heater relay

(15) Wastegate solenoid (if equipped)

(16) Oil filler tube

(17) Air compressor

(18) Electronic Control Module ECM

The engine is a in-line six cylinder engine. The firing order of the engine is 1-5-3-6-2-4. The engine’s rotation is counterclockwise when the engine is viewed from the flywheel end of the engine. The engine utilizes a turbocharger and an air-to-air aftercooler. The engines have a bore of 110 mm (4.3 inch) and a stroke of 127 mm (5.0 inch). The displacement is 7.25 L (442 cu in ).

The hydraulic electronic unit injector system (HEUI) eliminates many of the mechanical components that are used in a pump-and-line system. The HEUI also provides increased control of the timing and increased control of the fuel air mixture. The timing advance is achieved by precise control of the unit injector timing. Engine rpm is controlled by adjusting the injection duration. A special pulse wheel provides information to the Electronic Control Module (ECM) for detection of cylinder position and engine rpm.

The engine has built-in diagnostics in order to ensure that all of the components are operating properly. In the event of a system component failure, the operator will be alerted to the condition via the check engine light that is located on the control panel. An electronic service tool can be used to read the numerical code of the faulty component or condition. Intermittent faults are logged and stored in memory.

Starting The Engine

The engine’s ECM will automatically provide the correct amount of fuel in order to start the engine. Do not hold the throttle down while the engine is cranking. If the engine fails to start in twenty seconds, release the starting switch. Allow the starting motor to cool for two minutes before the starting motor is used again.


Excessive ether (starting fluid) can cause piston and ring damage. Use ether for cold weather starting purposes only.

Cold Mode Operation

Starting the engine and operation in cold weather is dependent on the type of fuel that is used, the oil viscosity, and other optional starting aids. For more information, refer to the Operation and Maintenance Manual, “Cold Weather Operation”.

Posted in C7

Leave a Reply

Your email address will not be published. Required fields are marked *