AFTERCOOLER & AFTERCOOLER LINES 6V2351 - Caterpillar

G3508 (9TG);
G3512 (5JD, 7NJ);
G3516 (8LD, 4EKIntroduction
This special instruction provides essential information in order to select a proper service harness for a particular G3500 Engine with an Electronic Ignition System (EIS).This special instruction also provides listings of applicable hardware, tools, and procedures and contains helpful hints used in the installation of the service harness. It is very important that the information contained here is fully understood before attempting an installation. It should also be understood that due to the many varied engine wire configurations, it is not possible to write procedures that explain in detail every possible option. Therefore, these procedures should be viewed as general in nature with possible gaps in the sequence.
Do not perform any procedure outlined in this publication or order any parts until you have read and understood this information.
Selection Of Service Harness
Many optional features have been provided for the G3500 Engines. Each of these features may require additional wires within the original harness. It is not possible to provide a service harness that will match all different combinations of options. In an attempt to minimize the total number of harnesses and to meet as many applications as possible it has become necessary to group all wires into four main engine categories. The four categories are:* Electric Power Generation (EPG)* Industrial* Landfill* CoGenEach category contains wiring for its most used options while excluding those wires of its least used options. As a result, any given service harness may contain unused wires and connectors while, at the same time, require the customer to provide custom wiring for the lesser used options. The following is a listing of items that are not supported with a service harness.* Electric Starter* Alternator* Water Level Alarm Switch* Left Hand Air Starter* Digital Voltage RegulatorEach of the four G3500 harness categories identifies a service harness for a particular application. To determine which part number is needed, refer to Chart 1 entitled "Service Harness Part Numbers And Engine Categories". Determination Of Service Harness Design
G3500 EIS engines were built with two slightly different harness designs. The two designs are differentiated by the terms "early build" harnesses and "current production" harnesses. Chart 2 entitled "Serial Numbers And Service Harness Designs" indicates the serial numbers appropriate for the G3500 EIS Engines and the two unique harness designs. Selection Of Miscellaneous Parts Kit
A 131-2217 Harness Parts Kit of miscellaneous hardware pieces has been provided for all "early build" harnesses. This kit is needed only for "early build" harnesses and is not required when servicing harnesses on engines with serial numbers larger than those listed in Chart 2.Chart 3 entitled "Miscellaneous Parts For 131-2217 Harness Parts Kit" shows a complete listing for all parts found in 131-2217 Harness Parts Kit. Optional Hardware
As indicated above, the electric starter and alternator wires are not supplied with the service harness. Therefore, if this option is part of the original engine installation, then custom wires must be provided, power distribution box and its contents must be removed, and starter solenoid switch