BUSHING 5I7529 - Caterpillar

Some engines are equipped with two turbochargers that are mounted at the rear of the engine. Other engines have four turbochargers which are mounted in the center of the engine. The turbine side of each turbocharger is connected to the respective exhaust manifold. The compressor side of each turbocharger is connected by pipes to the aftercooler housing. The turbocharger is supported by the central exhaust elbow.
Illustration 1 g00322583
Turbochargers (typical example)
(1) Turbocharger
(2) Oil drain line
(3) Oil supply line
Illustration 2 g00307853
Turbocharger (typical example)
(4) Compressor wheel
(5) Bearing
(6) Oil inlet port
(7) Bearing
(8) Turbine housing
(9) Turbine wheel
(10) Air inlet
(11) Oil outlet port The exhaust gases go into the exhaust inlet of turbine housing (8). The gases push the blades of turbine wheel (9). The turbine wheel and compressor wheel (4) turn at speeds up to 60,000 rpm.Clean air from the air cleaners is pulled through air inlet (10) by the rotation of the compressor wheel. The action of the compressor wheel blades causes a compression of the inlet air. This compression gives the engine more power because the compression allows the engine to burn additional fuel with greater efficiency.The maximum speed of turbocharger (1) is controlled by the fuel setting, the height above sea level, and the inlet restriction.
If the fuel setting is higher than given in the TMI (Technical Marketing Information), there can be damage to engine or turbocharger parts. Damage will result when increased heat and/or friction due to the higher engine output goes beyond the engine cooling and lubrication systems abilities. A mechanic that has the proper training is the only one to make the adjustment of fuel setting and high idle rpm setting.
Bearing (5) and bearing (7) in the turbocharger use engine oil under pressure for lubrication. The engine oil is sent through oil supply line (3) to oil inlet port (6). The engine oil then goes through passages in the center section for lubrication of the bearings. The engine oil goes out of oil outlet port (11) at the bottom. The engine oil then goes back to the flywheel housing through oil drain line (2).