Usage:
3508B (2BM, 7SM, 1TW),
3512B (7HM, 4TN, 2GW),
3516B (8CN, 8KN, 3CS) Marine;
3508B (3DM, 3DW),
3512B (8EM, 1PW),
3516B (9AN, 2FW) Marine Auxiliary;
3508B (4GM, 6PN, 2HW),
3512B (8RM, 6WN, 4AW),
3516B (6HN, 7RN, 1NW) Generator Set Engines
Reference: Engine News, November 1996, Page 7, "E-Trim Unit Fuel Injectors".
Caterpillar will no longer be producing non-E-trim injectors for 3500B engines. Replacing the non-E-trim injectors are equivalent E-trim injectors that are already in production. E-trim injectors include a four digit code number located on the injector tappet. This code designate the injector's flow characteristics. The purpose of the E-trim injector is to reduce fuel delivery variations between individual injectors. The chart shows the non-E-trim injectors with the equivalent E-trim injectors.
(TOP VIEW) Typical 3500B E-Trim Injector.
The E-trim software should have previously been installed. E-trim software, along with Electronic Technician (ET) or Electronic Control Analyzer Programmer (ECAP) are needed for utilizing the functions of the E-trim injectors. When installing E-trim injectors, locate the "Injector Code" Screen in ET/ECAP. The screen is located in the "Calibrate/Monitor Sensor" menu screen as Item 4 "Read Change Injector Codes". Enter the four digit code number located on the E-trim injector tappet. The "Injector Code" must be entered and agree with the cylinder in which it is installed. Non-E-trim injectors used a default code, 1100, that was entered into the Electronic Control Module (ECM). This default code allowed the non-E-trim injectors to be used with the new E-trim software. With the new E-trim injectors, entering the four digit code, located on the injector tappet, will optimize engine performance. Entering the four digit code also allows the engine to recognize the difference between non-E-trim and E-trim injectors. This makes it possible to run split setups.