TURBOCHARGER
Turbocharger Components and Functions
12/05
6LY3 Service Manual
9-5
© 2007 Yanmar Marine International
Turbine
Exhaust gases coming out of the engine are
accelerated through the nozzle and directed on the
blades of the turbine rotor. This adds rotational
torque to the turbine shaft.
The body of the turbine provides seal rings and
housings designed to protect the bearings from the
hot exhaust gases.
Compressor
The impeller of the compressor is installed on the
other end of the turbine shaft. As the turbine is
accelerated by engine exhaust gases, it transmits
the additional torque through the turbine shaft to
the compressor impeller. The impeller compresses
intake air and delivers it to the intake manifold.
Bearings
The thrust bearing (axial bearing) prevents the
turbine shaft from shifting due to the constant thrust
loads of the turbine. The radial bearings use double
oil films on their inside and outside surfaces that
flow in the direction of bearing rotation. This
reduces frictional drag on the face of the bearing
and contributes to the dynamic stability of the
turbocharger.
Seal Structure of the Compressor
Housing
A dual-wall structure is incorporated into the
pressure bulkhead of the compressor housing. This
prevents pressurized intake air and oil from
entering the turbine. It consists of a seal ring and
an oil deflection plate.
