KIT-GASKET 7X2526 - Caterpillar

Engine: 3516B (S/N: 1NW1) 3512B (S/N: 1PW1) 3516B (S/N: 2FW1) 3508B (S/N: 2HW1) 3508B (S/N: 3DW1) 3512B (S/N: 4AW1)Introduction
The modification is recommended for the 3508B land and offshore petroleum engines, the 3512B land and offshore petroleum engines, and the 3516B land and offshore petroleum engines. These engines must be equipped with the electronic instrument panel that is used in applications when the external governor control produces an engine actuator signal of 0 to 200 mA. These applications include the SCR systems.Description and FunctionThe engine ECM normally uses a desired speed signal to set the steady engine speed. This system depends on the engine ECM in order to govern the engine at a steady engine speed. Direct fueling bypasses the governor in the engine ECM. Also, direct fueling sends a signal directly to the injection portion of the engine ECM. This modification consists of a control signal filter and a voltage converter. The voltage converter provides a control voltage (DCV) to the existing 9X-9591 Electrical Converter (Pulse Width Modulated). The electrical converter produces the PWM signal to the engine ECM. This modification allows systems that are SCR controlled to use an engine actuator signal of 0 to 200 mA in order to control a 3500B series engine. The modifications to the software within the engine ECM allow this control signal to directly control the virtual rack position of the engine. Input control current from the SCR control is proportional to desired fuel when the direct fuel control is exerted. The engine ECM still retains basic engine protection functions.
Illustration 1 g00616858
Once the modification is installed, the capabilities of load sharing that are built into the SCR control can be fully utilized. This makes it simple to repower a D399 engine with a 3500B series engine. This also makes it possible to parallel a 3500B series engine with a mechanical unit injected engines.The following major components are added during this modification:
One Control Group in order to convert the signal of 0 to 200 mA to an isolated DC voltage
Software that is flashed into the engine ECM which allows the direct fueling to function
Table 1
Software Part Numbers    
178-9617 Direct Fueling Software for 3508B, Engine ECM 1200 RPM, petroleum application    
176-6176 Direct Fueling Software for 3512B, Engine ECM 1200 RPM, petroleum application    
178-9164 Direct Fueling Software for 3516B, Engine ECM 1200 RPM, petroleum application    Glossary of TermsEngine ECM - Electronic control module for 3500B series engines.ECS (Engine Control Switch) - The switch is located on the electronic instrument panel or the engine ECM. The switch is considered to be the master control for the engine.EIP (Electronic Instrument Panel) - The panel houses the electrical connections for the engine electrical, instrumentation and controls. The panel is usually mounted on the 3500B series engine but the panel may be mounted in a remote location.Subpanel For The EIP - The subpanel is a steel plate that is mounted in the back interior of the EIP. This plate supports most of