09450-08380 PUMP ASSY, INJECTI Calibration Data

Air Induction And Exhaust System
Restriction Of Air Inlet And Exhaust
Engine horsepower and efficiency will be reduced if either the air inlet or exhaust system becomes restricted.The air cleaner should not restrict air flow to the point of 30" (762 mm) of water difference in pressure.Exhaust back pressure (pressure difference measured between the turbocharger outlet elbow tap and the ambient air) should be no more than 15" (381 mm) of water, difference in pressure.Measuring Inlet Manifold Pressure
When an engine is suspected of lacking power, it is sometimes desirable to make a quick instrument check to determine the approximate horsepower.By checking inlet manifold pressure, and comparing that pressure with the RACK SETTING INFORMATION, one can determine if an engine is operating efficiently. This test should be used if engine horsepower seems to be too low, yet no specific symptom of engine trouble is apparent.Inlet manifold pressures in the RACK SETTING INFORMATION are recorded under specific operating conditions: 29.4 inches (746,76 mm) of mercury barometric pressure, 85° F. (29.4° C.) ambient temperature and 35 API rated fuel. Any deviation from these conditions can affect the inlet manifold pressure. Ambient air which is denser than that at 85°F./29.4 inches (29.4°C./746,76 mm) of mercury, can cause a slightly higher horsepower and inlet manifold pressure reading than listed in the RACK SETTING INFORMATION. If the ambient air is less dense, the horsepower and inlet manifold pressure rating can be slightly lower than the values given in the RACK SETTING INFORMATION. Fuel density (API gravity rating) also affects the horsepower and inlet manifold pressure. If the fuel is rated above the standard 35 API gravity rating, the inlet manifold pressure can be slightly less than the value given in the RACK SETTING INFORMATION. If the fuel is rated below the standard rating, the inlet manifold pressure can be slightly more. Be sure the air inlet and exhaust are not restricted when checking inlet manifold pressure.The components in a 4S6553 Instrument Group provide a means of reading engine RPM and inlet manifold pressure simultaneously. This group contains an instantaneous reading tachometer and a gauge for reading inlet manifold pressure. Instructions (FE036044) included with this group, explain the testing procedure.Checking Inlet Manifold Pressure At Engine Full Load And Speed
4S6553 Instrument Group.Checking inlet manifold pressure (frequently referred to as "boost") at engine FULL LOAD and speed (governor balance point), provides a convenient test of engine performance. To check inlet manifold pressure, some method of loading the engine must be provided. The preferred method is by using a chassis dynamometer. An alternate method of loading the engine is to pull a loaded trailer, and use the brakes.Using the 4S6553 Instrument Group, proceed as follows:1. Connect the manifold pressure gauge to the inlet manifold.
1-Location to check inlet manifold pressure.2. Connect the tachometer to the engine to locate the full load RPM (governor balance point). At the balance point, rack position and the injection pump speeds are such that maximum fuel is delivered to the engine, turbocharger