Inspect the air inlet and exhaust system. Make sure that there are no obstructions or leaks in the system.
| Tools Needed | Qty | |
| 1U-5470 Engine Pressure Group | 1 | |
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| Illustration 1 | g00295554 |
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1U-5470 Engine Pressure Group | |
The 1U-5470 Engine Pressure Group is used to measure the inlet air restriction and the exhaust back pressure.
Air inlet restriction is the difference in pressure between the air lines after the air cleaner and the atmospheric air pressure.
Use the differential pressure gauge of the 1U-5470 Engine Pressure Group in order to measure the air inlet restriction. Connect the pressure port of the differential pressure gauge to the opening for the air filter service indicator on the air cleaner.
For optimum operation, replace the air filter when the air filter restriction reaches the restriction value for your particular engine application. Refer to the applicable Gas Engine Technical Data Sheet for additional information. The maximum air filter restriction is
Aftercooler Differential Pressure
Aftercooler differential pressure is the difference in air pressure between the inlet and the outlet of the aftercooler.
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| Illustration 2 | g06319658 |
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G3500H (1) Outlet port (2) Inlet Port | |
The maximum differential pressure for the aftercooler is
The 8T-0452 Manometer Gauge is used to measure the differential pressure across the aftercooler. Remove plugs from the aftercooler ports.. Connect the manometer in the location of the plugs. Measure the differential pressure when the engine is operating at full load.
Exhaust restriction (back pressure) is the difference in the pressure between the exhaust at the outlet elbow and the atmospheric air pressure.
In addition to the loss of efficiency and power, excessive exhaust restriction will lead to these results: high engine temperatures, reduced service life of the turbocharger and early problems with inlet and exhaust valves.
Use the differential pressure gauge of the 1U-5470 Engine Pressure Group in order to measure the exhaust back pressure.
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Hot engine components can cause injury from burns. Before performing maintenance on the engine, allow the engine and the components to cool. |
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Making contact with a running engine can cause burns from hot parts and can cause injury from rotating parts. When working on an engine that is running, avoid contact with hot parts and rotating parts. |
Connect the pressure port of the differential pressure gauge to the test location on the exhaust manifold. The test location may be located anywhere along the exhaust piping after the turbocharger but before the muffler. Choose a location that is as close to the engine as possible. Install the probe into a straight pipe that is three to five diameters of the pipe away from the last transition.
The maximum exhaust back pressure is