BEARING 8D7685 - Caterpillar

Engine: G3512B (S/N: JHH1-UP)Introduction
Do not perform any procedure in this Special Instruction until you read this information and you understand this information.This Special Instruction provides the following information for G3512B A3 Engine:
Required information
Requirements for the electrical system
Grounding practices
Proper welding practices
Service tools
Wiring connections
Initial start-up procedures
Governor adjustment proceduresReferenceThe following information is required in order to perform the installation and initial start-up:
Complete analysis of the fuel
Data from a complete fuel analysis that is entered into Caterpillar Software, LEKQ6378, "Methane Number Program"
The engines performance data sheet from the engines Technical Marketing Information (TMI)
Engine Operation and Maintenance Manual, SEBU8099
Systems Operation/Testing and Adjusting, RENR9352
Troubleshooting Manual, RENR9353
Service Manual, RENR4911, "Exhaust Temperature Scanner"Required Information
Ignition Timing
A complete fuel analysis must be conducted prior to putting the engine into service. Obtain a fuel analysis in order to determine the fuel energy content and calculate the methane number. The methane number indicates the ability of the fuel to be ignited. The methane number is determined when you input the data from the fuel analysis into the Methane Number Program, LEKQ6378. Use the methane number and the Engine Performance, "Fuel Usage Guide" in order to determine the ignition timing.Obtain several samples of fuel if the quality is expected to change. If the methane number will vary during engine operation, use the lowest expected value in order to determine ignition timing.Maximum Load
Refer to the Data Sheet on engine performance from Technical Marketing Information (TMI) to determine power level for altitude, temperature, and methane number. Use the information in the Engine Performance, LEBQ6117 in order to determine the maximum engine load. The desired engine load must not exceed the maximum engine load.Inlet Manifold Pressure at Full Load
Use the inlet manifold pressure to estimate the engines load. The inlet manifold pressure may be used if the engine timing and the exhaust NOx are set properly. Refer to the Data Sheet on performance from TMI to determine inlet manifold pressures for specific settings of timing and emissions. If the engine power is derated, interpolate the desired inlet manifold pressure between the 100 percent and the 75 percent load ratings.Level of Exhaust Emissions
The 156-1060 Emissions Analyzer Gp or another emissions analyzer is required in order to set up a gas engine. The engine performance Data Sheet gives the levels of emissions for engine loads of 50 percent, 75 percent, and 100 percent. Set up the engine in accordance with the Data Sheet at desired full load with data that was taken at 100 percent load.Note: Use NOx levels to set up the engine, when possible.Gas Pressure Regulator
The gas pressure regulator requires adjustment when the engine is installed. Use only Caterpillar approved regulators in order to avoid problems with performance. A balance line for the regulator is required on all gas engines. This line compensates for changes in boost pressure or in air filter restriction.Note: The supply line to the gas pressure regulator must be of adequate diameter to provide constant pressure to the regulator. Do not use supply lines that are smaller than the