850-002   Definition of Critical Parts List Headings

Critical Parts List (CPL) This is the CPL. This is sometimes called the control parts list in the factory.

Engine Models All engine Models on the CPL are listed. All engine models on a CPL will not be certified. Reference the fuel pump code.

Certified Year and Country This is the year the CPL is certified by the organization indicated. Note that certification by one organization does not imply certification by any other organization. Be certain that the CPL meets the appropriate certification required for the environment where the engine will be used. All CPL's are NOT certified. Many CPL's are certified or "registered" in other countries. The engine must meet the standards of the year it was originally built. If the original certified CPL is superseded by a later CPL, the engine can be built to a later CPL. Do not rebuild an engine to a CPL certified before the engine was built.

Injector This is the injector assembly that is certified on the CPL. Most assemblies listed are less link. Before 1978, injectors were certified that had a link. Check the parts listing for complete injector breakdown. Do not mix high flow and low flow injectors in an engine.

Injector Flow The injector flow is listed. If the flow is followed by a letter or letters, the injector is calibrated on ST-790 at less than the standard 1000 strokes, calibrated at (80 psi, not 120 psi), using a different camshaft or a combination of these variations. See the following list;

Camshaft The bare camshaft part number is listed. Right handed and left handed camshafts are included.

Piston The bare piston part number is listed.

Turbocharger The turbocharger assembly is given in this list.

Cylinder Head This is the bare cylinder head part number. Check your parts listing for head assemblies with or less valves as needed.

Engine Timing The engine timing code and nominal injector push rod travel are listed. for complete timing specification, refer to the rear of the CPL manual. Engine timing procedure are in the engine troubleshooting/repair and shop manual.

If B and C engine timing is not on the CPL, refer to the engine dataplate.

Exhaust Manifolds The type of manifold is listed as either wet (water cooled), dry, or pulse.

Aftercooler CPL's are listed as either with or less aftercooler. This part is sometimes called an intercooler. When available, the core part number is listed.

Air Fuel Control This is the AFC. If applicable, refer to the fuel pump calibration for AFC settings.

Aneroid The aneriod assembly is given in this list. If applicable, refer to the fuel pump calibration for aneroid settings.

Air Signal Attenuator The is the ASA valve. This part can be either air of hydraulic. The air ASA valve produces a slight delay between the air intake manifold and the AFC. The hydrauliic ASA valve controls the fuel flow from the AFC cavity.

Thermostat The required thermostat is given.

Fuel Lines The fuel lines used on A, B, and C engine models with the high pressure systems are given.

Glow Plugs The glow plugs used on the A engine models.

Glow Plug Controller This part is used on the A engine models.

Prechamber Insert This is the precombustion prechamber insert used on the A engine models.

Variable Timing Control The fuel injection variable timing control is listed.

CELECT This is for the electronic controlled injection engine models.

Electronic Control Module (ECM) This is the control module used on electronic control injection engines.

Engine Position Sensor (EPS) This part sense the engine speed on electronic controlled injection engines from the camshaft gear.

Camshaft Gear A special gear is necessary when an EPS is used.

Pressure Sensor (Boost Sensor/Intake Manifold Pressure SensorThe turbocharger boost pressure sensor is required on electronic controlled injection engines.

Coolant Temperature SensorThe engine coolant temperature sensor is required on electronic controlled injection engines.

Pressure regulator Valve This is the pressure regulator used on gas engines (CNG, LNG, Propane).

Spark Plug This is the spark plug/coil component for gas engines gas engines (CNG, LNG, Propane).

Air/Fuel Mixer This is the air/fuel mixing valve used on gas engines (CNG, LNG, Propane).

Oxygen Sensor This is the oxygen sensor used on gas engine control systems.

Fuel Flow Valve This is the fuel control valve on gas engines (CNG, LNG, Propane) that meters the fuel quantity into the air/fuel mixer.

Current Production If a CPL is no longer being built, it will be noted.

Fuel Pump Codes Fuel pump codes are not part of a CPL. Refer to the fuel pump code index manual for the CPL, engine model, and fuel pump certification status. Do not use an uncertified code on a certified engine model even if it is listed under the same CPL.

CPL Cross Reference List This list is for reference purposes only indicating the two CPL's are similar. It does not necessarily mean one can replace the other. Never interchange fuel pump codes from one CPL to another.

The word superseded can mean the complete CPL is no longer being built or only a particular model under the CPL is included in the superseding CPL. Check parts lists and certification status very carefully before making and conversions.

As an example, the cross reference list shows CPL 1 referenced to CPL 168. Actual further study shows only the NT-855-R2 model is superseded, and then only by adding an aftercooler, a wet exhaust manifold, and turbocharger change. naturally, the fuel pump calibration is also affected.