
Workshop Manual, TPD 1353E, Issue 3
215
15
Peregrine EDi and 1300 Series EDi
Auxiliary equipment
15
Compressors
General description
The Bendix 2150, Bendix 550 and Bendix 750 direct drive compressors are fitted to the rear face of the timing
case on the left side of the engine. The drive gear for the compressor is engaged with the lower idler gear in
the timing case.
The cylinder head of the single cylinder compressor is cooled by coolant from the engine. The compressor is
lubricated from the lubrication system of the engine. Oil passes through an external pipe from the engine
pressure rail to the compressor crankcase. The oil passes to the main bearings and the big end bearings of
the compressor and also to the rear bush for the drive shaft. Oil drains from the compressor crankcase into the
drive housing and lubricates the drive gears and the bearing. The oil returns to the engine sump through the
timing case.
Operation
As the piston moves down the cylinder, air pressure above the piston is reduced. The reduction in air pressure
opens the inlet valve and allows air to enter the cylinder above the piston. As the piston moves up the cylinder,
air pressure under the valve and the action of the valve spring closes the valve. The increase in air pressure
under the delivery valve, opens the valve and air is discharged to the reservoir. Air pressure in the reservoir is
controlled by an unloader valve which, at a certain pressure, holds the inlet valve of the compressor open until
air pressure in the reservoir is reduced.
This document has been printed from SPI². Not for Resale
Содержание 1300 EDi Series
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