C15 Petroleum Engine Product Description Caterpillar

Product Description
1.1. Aftermarket Products and Caterpillar Engines
2.1. Welding and Caterpillar Electronic Engines

Table 1
C15 Engine Specifications 
Cylinders and Arrangement  In-line six cylinder 
Bore  137.2 mm (5.4 inch) 
Stroke  171.5 mm (6.8 inch) 
Displacement  15.2 L (928 in3) 
Firing Order  1-5-3-6-2-4 
Rotation (flywheel end)  Counterclockwise 

The electronic engines that are covered by this manual have the following characteristics: direct fuel injection, electronic unit injection that is mechanically actuated, turbocharged and air-to-air aftercooled (ATAAC).

The electronic engine control system provides the following functions: electronic governing, automatic air to fuel ratio control, torque rise shaping, injection timing control and system diagnostics.

An electronic governor controls the output of the unit injectors in order to maintain the engine rpm that is desired. The functions of the governor include a programmable low idle and a 20 rpm to 200 rpm governor overrun.

High injection pressures are produced by electronically controlled, mechanically actuated unit injectors. The injectors combine the pumping and the electronic fuel metering (duration and timing) during injection. The unit injectors accurately control smoke limiting, white smoke, and engine acceleration rates.

There is one unit injector per cylinder. Individual unit injectors meter the fuel. The individual unit injectors also pump the fuel. The metering and the pumping is done under high pressure. High injection pressures help to reduce fuel consumption and emissions. The use of this type of unit injector provides total electronic control of injection timing. The injection timing varies with engine operating conditions. The engine performance is optimized in the following areas:

  • Starting

  • Emissions

  • Noise

  • Fuel consumption

The timing advance is achieved through precise control of the injector firing. Engine speed is controlled by adjusting the firing duration. The information is provided to the Electronic Control Module (ECM) by an engine speed/timing sensor. The information is for detection of cylinder position and engine speed.

The engines have built-in diagnostics in order to ensure that all of the components are functioning and operating properly. In the event of a system component deviation from the programmed limits, the operator will be alerted to the condition by a DIAGNOSTIC lamp. The DIAGNOSTIC lamp is mounted on the control panel. An electronic service tool that is provided by AVSpare may be used to read the numerical code of the diagnostic flash code. There are three types of diagnostic codes: ACTIVE, LOGGED and EVENT. These codes are logged and stored in the ECM. Refer to the Operation and Maintenance Manual, "Engine Diagnostics" for additional information.

The cooling system consists of the following items: a centrifugal pump that is driven by a gear, water temperature regulator, an oil cooler and a radiator that incorporates a shunt system.

The engine lubricating oil is supplied by a gear type pump. The engine lubricating oil is cooled and filtered. The bypass valves provide unrestricted flow of lubrication oil to the engine parts when the oil viscosity is high or if either the oil cooler or the oil filter elements (paper cartridge) become plugged.

Engine efficiency, efficiency of emission controls, and engine performance depend on adherence to proper operation and maintenance recommendations. This includes the use of recommended fuels, coolants, and lubrication oils.

Aftermarket Products and AVSpare Engines


In order to maximize fuel system life and prevent premature wear out from abrasive particles in the fuel, a two micron absolute high efficiency fuel filter is required for all AVSpare Electronic Unit Injectors. AVSpare High Efficiency Fuel Filters meet these requirements. Consult your AVSpare dealer for the proper part numbers.

When auxiliary devices, accessories, or consumables (filters, additives, catalysts, etc.) which are made by other manufacturers are used on AVSpare products, the AVSpare warranty is not affected simply because of such use.

However, failures that result from the installation or use of other manufacturer devices, accessories, or consumables are NOT AVSpare defects. Therefore, the defects are NOT covered under the AVSpare warranty.

Welding and AVSpare Electronic Engines


Because the strength of the frame may decrease, some manufacturers do not recommend welding onto a chassis frame or rail. Consult the OEM of the equipment or your Cat dealer regarding welding on a chassis frame or rail.

To help avoid damage to the electronic controls, proper welding procedures are necessary. Before welding on a vehicle that is equipped with an electronic engine, observe the following precautions:

  1. Turn off the engine. Place the key start switch in the OFF position.

  2. If the application has a battery disconnect switch, open the switch. Otherwise, disconnect the negative "-" battery cable from the battery of the vehicle.


    Do not ground the welder to electrical components such as the ECM or sensors. Improper grounding can cause damage to the drive train bearings, hydraulic components, electrical components, and other components.

    Clamp the ground cable from the welder to the component that will be welded. Place the clamp as close as possible to the weld. This will help reduce the possibility of damage.

  3. Clamp the ground cable from the welder to the component that will be welded. Place the clamp as close as possible to the weld.

  4. Protect wiring harnesses from welding debris and from spatter. Use proper welding procedures.

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