PISTON-LOAD 7S4594 - Caterpillar

All Engines Manufactured By CaterpillarReference: Special Instruction, SEHS8417, "Using The Fuel Setting And Related Information Microfiche Libraries." When ordering turbocharger or fuel system components for Caterpillar engines, the parts books can sometimes be misleading. To ensure the correct parts are ordered, refer to the Fuel Setting Microfiche Library. See the Reference for complete information about how to use the Fuel Setting Microfiche Library.
Engines produced since mid-1982 have a performance specification number stamped on the Engine Information Plate (see Illustration 1). This number starts with a "OT" and ends with four digits. If the performance specification number (OT Specification) can be found, it can be used to immediately go to the OT Fuel Specification microfiche to identify turbochargers, or fuel system components such as unit injectors, fuel nozzle assemblies, fuel pump/governor groups, governor springs, timing advances, torque control groups, and torque control group springs and spacers.
Illustration 1. Sample Engine Information Plate.If the OT Specification is not readily available, the correct part numbers for these components can be obtained through a variety of other avenues. The flow chart (see Illustration 2) shows different directions to take depending on the type of initial information available. The top row on the chart shows the information available then proceeds down to show which path to take to obtain the correct part numbers. In order to pursue some of the paths, it is necessary to have access to some computer programs which are available to all dealers: Product Information System and Engineering Technical Data System (ETDS - Marketing).
Illustration 2. Path used (Case I, Case II, etc.) depends upon information known.Case I
If there is no information known about the engine serial number, OT Specification, or vehicular product identification number, the turbocharger should have a tag with the part number on it, and the unit injectors or fuel nozzles should have part numbers stamped on them.
Case II
If neither the engine serial number nor the OT Specification is known, but the vehicular product identification number is known, use the Product Information System, screen 06 (INQ PM S/N List), to find the serial number of the engine in that vehicle. Once the engine serial number is known, go to ETDS, screen 18 (Engine History Info), to find the OT Specification.
Case III
If the engine serial number is known but neither the OT Specification nor vehicular product identification number is known, go directly to ETDS screen 18 to find the OT Specification. If no history is available for the engine on ETDS screen 18, the engine may have been produced prior to mid-1982, and therefore has no OT Specification. In that case, consult Fuel Setting Information microfiche SEFU5735, SEFU5736, SBFY1106, or SBFY1107. These microfiche cover engines produced prior to the advent of OT Specifications.
If all of these avenues of research are exhausted, and no answers can be found, contact an Engine Division Product Analyst for help.