PIN AS 5V1510 - Caterpillar

Table 1
Tools Needed    
Part Number     Part Name     Quantity    
1U-5470     Engine Pressure Group     1    When an engine is not developing sufficient power, the horsepower of the engine should be checked. Use the 1U-5470 Engine Pressure Group to check the pressure in the inlet manifold.
Illustration 1 g00293196
1U-5470 Engine Pressure Group This tool group has a gauge that can read pressure in the inlet manifold. The Special Instruction, SEHS8524 is provided with this tool.The engine must be adjusted correctly in order to obtain correct results from the tests.Engine operating efficiency can be obtained by checking the inlet manifold pressure. Compare the pressure in the inlet manifold with the pressure that is given in the Technical Marketing Information. This test can be used if the engine is experiencing low horsepower. This test can not be used with any other problem.Gas engines can burn a wide range of gaseous fuels. The BTU content of the fuel is a measure of the power content of the fuel. The fuels that have a high BTU content require less gas pressure to obtain a specific horsepower.A complete fuel analysis must be conducted prior to putting the engine into service. Obtain a fuel analysis in order to determine the BTU content of the fuel. Calculate the methane number. The BTU content indicates the amount of energy that is available in the fuel. The methane number indicates the ability of the fuel to be ignited. The methane number is determined when you input the constituents of the fuel into the Methane Number Program, LEKQ6378. Use the methane number and the Engine Performance Guide, "Fuel Usage Guide" in order to determine the ignition timing.Fuels with a low methane number burn so fast that the timing must be retarded. If the timing on an engine is too early, the fuel will burn too quickly. The fuel will burn before the piston passes the top center position. This results in knocking.The air/fuel ratio adjustment is made by changing the gas pressure. Excess gas makes a rich mixture and not enough gas creates a lean mixture. Either one of these conditions will create poor engine performance. The air/fuel ratio at no load is controlled by the gas regulator. The load valve controls the air/fuel ratio. The load valve is located at the carburetor.The high heat value (HHV) of a fuel is a unit of measurement. This is a measurement of the content of heat in the fuel. The low heat value (LHV) of the fuel is an important measurement. The process of combustion forms carbon dioxide and water. Heat that is needed for the conversion of water into vapor is lost to the engine. The heat that can be used in the fuel is the LHV of the fuel. The low heat value of a fuel is ten percent lower than the high heat value of natural gas. When the HHV is given, change the specification to the LHV. This will ensure that the