KIT-SENSOR 2785273 - Caterpillar

Restriction of Air Inlet and Exhaust
There will be a reduction in the performance of the engine if there is a restriction in the air inlet system or the exhaust system.The air flow through a used air cleaner may have a restriction. The air flow through a plugged air cleaner will be restricted to some degree. In either case, the restriction must not be more than the following amount:
7.5 kPa (30 in H2O)Back pressure is the difference in the pressure between the exhaust at the outlet elbow and the atmospheric air. Back pressure from the exhaust must not be more than the following amount:
6.7 kPa (27 in H2O)Measurement of Pressure in Inlet Manifold
The efficiency of an engine can be checked by making a comparison of the pressure in the inlet manifold with the information in the Technical Marketing Information (TMI).This test is used when there is a decrease of horsepower from the engine, yet there is no actual sign of a problem with the engine.The correct pressure for the inlet manifold is also given in the Technical Marketing Information (TMI), "Fuel Setting and Related Information". These standards are established under the following conditions:
96 kPa (29 Inches Hg) dry barometric pressure.
29°C (85°F) outside air temperature
35 API rated fuelAny change from these conditions can change the pressure in the inlet manifold. The outside air may have a higher temperature and a lower barometric pressure than the values that are given above. This will cause a lower inlet manifold pressure measurement than the pressure in the TMI. Outside air that has both a lower temperature and a higher barometric pressure will cause a higher inlet manifold pressure measurement.A difference in fuel density will change horsepower (stall speed) and boost. If the fuel is rated above 35 API, the pressure in the inlet manifold can be less than the pressure that appears in the TMI. If the fuel is rated below 35 API, the pressure in the inlet manifold can be more than the pressure that appears in the TMI. BE SURE THAT THE AIR INLET OR THE EXHAUST DOES NOT HAVE A RESTRICTION WHEN YOU ARE MAKING A CHECK OF THE PRESSURE.Use 1U-5470 Engine Pressure Group to check the pressure in the inlet manifold.Remove the plug on the aftercooler housing in order to measure inlet manifold pressure.
Illustration 1 g00293196
1U-5470 Engine Pressure Group This tool group has a gauge to read pressure in the inlet manifold. Refer to Special Instruction, SEHS8524 for the operation of this tool group.Turbocharger
Inspect the bearing of the turbocharger if any unusual sound or vibration is noticed.A quick check of the bearing condition can be made without disassembling the turbocharger. This can be done by removing the piping from the turbocharger and inspecting the following items.
The compressor impeller
The turbine wheel
The compressor coverRotate the compressor and the turbine wheel assembly by hand and observe by feeling excess end play. The rotating assembly should rotate freely. There should be no rubbing or binding of the rotating assembly. If there is any indication