keeping them running
Page 63
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by Trevor Longcroft
most large workshops the r certain method of tracing -injection system malfunc s is the time-consuming one removing each component the engine and testing it specialized equipment. And happens even for a relatively or fault, a state of affairs pily unnecessary with the analyser system developed Vlobil Oil in conjunction with . of Austria.
iith AVL equipment the fuel ern of any engine up to eight nders can be checked lout its being removed from engine. There are four basic iponents; a matched set of -tz pressure-transducers — for each injector or injector line; the 850 analyser; a lode ray oscilloscope; and a aoscopic light source.
le transducers fit specially gned adaptors which ideally ild be fitted to each injector or injector line when vehicles are bought.
When an engine needs to be checked, the appropriate transducers are fitted to each line and the following parameters read off from the oscilloscope: injection period, nozzle-opening pressure, injection line pressure, residual line pressure, engine speed, starting fuel delivery and fuel delivery at idling.
The equipment needs to be operated by a fitter trained to interpret the diagrams on the oscilloscope, and quickly identify any malfunctions. The equipment costs between E3800 and £4200 depending on the number of cylinders to be tested. The English concessionaire is AVL Instrumentation Ltd, The Lodge House, Furness Vale Industrial Estate, Furness Vale, Near Stockport, Cheshire SK12 7QA.