Auxiliary Equipment - Perkins New 1000 Series Workshop Manual

New 1000 Series
15

Auxiliary equipment

15
Compressors
General description
The engines can be fitted with either a Bendix or a Knorr-Bremse compressor. The compressor is fitted on the
left side of the engine directly onto the rear face of the timing case. The compressor is driven from the main
idler gear through an idler gear for the compressor.
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 a 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 which drains from the compressor crankcase into the drive
housing, 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.
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Workshop Manual, TPD 1350E, Issue 4 329
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