Table of Contents
Advertisement
Crankshaft
The crankshaft has seven main bearings with fore and aft thrust
controlled at the rear bearing. One fractured cap connecting rod
is attached at each crankshaft journal. The piston pin moves
freely inside the connecting rod and piston. Piston pin retaining
rings secure the piston pin in the piston. The rear oil seal carrier
is part of the flywheel housing.
Cylinder Head
The cylinder head has four valves per cylinder with centrally
located fuel injectors directing fuel over the pistons.
configuration provides improved performance and reduces
emissions.
The fuel injection system is electro-hydraulic.
includes an under-valve-cover high-pressure oil manifold, fuel
injectors, and a high-pressure oil pump.
installed in the cylinder head, under the valve cover and under
the high-pressure oil manifold.
The water supply housing serves as the mounting bracket for
the refrigerant compressor. Mounting capabilities for a dual
refrigerant compressor are available as an option. The pad
mounting design of the alternator and refrigerant compressor
brackets provide easy removal and improved durability.
Page 18
SECTION 1 – ENGINE SYSTEMS
Electronic Control System
An Engine Control Module (ECM) monitors and controls engine
performance to ensure maximum performance and compliance
with EPA emissions requirements.
Heavy-Duty On-Board Diagnostics (HD-OBD) is a U.S.
Government mandated standard for all 2013 and later Class 4
and above vehicles with a Gross Vehicle Weight Rating (GVWR)
of 14,001 pounds or more. The HD-OBD system monitors the
engine and aftertreatment systems to verify they are operating
within emissions limits. If an emissions fault is logged, the
This
Malfunction Indicator Lamp (MIL) will illuminate and one or more
fault codes will be set.
The HD-OBD system operates similarly to previous power train
The system
control systems by storing fault codes and turning on the MIL. If
the problem that caused the fault goes away, the code will clear
The injectors are
and the MIL will go out after certain operating conditions have
been met. This may take several times operating the vehicle.
The Crankshaft Position (CKP) sensor and the Camshaft
Position (CMP) sensor are used by the ECM to calculate rpm,
fuel timing, fuel quantity, and duration of fuel injection.
Advertisement
Table of Contents
