Diesel watch
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• The AVL845 engine diagnostic system from VL Churchill gives a readout of power, torque, and relative compression of diesel engines without having to permanently instrument them.
By using a transducer clamp on each of up to eight injector pipes the unit will produce a graph of the pressure variations in the injectors and injection timing curves. The company says this, in conjunction with a TDC pick-up, allows blocked, seized or leaking injectors or pump timing faults to be spotted.
Power and torque are measured on a free acceleration test. The unit measures the speed at which the engine accelerates and puts that against an inertia figure to calculate the torque produced. The unit also gives a power reading by multiplying the torque figure by the engine speed. Relative compression is derived from the current drawn from the battery during cranking.
The AVL 845 is aimed at fleet users running a number of similar vehicles. Information is produced as printouts but it can he transferred to a PC if required. Cost, depending on specification, is around £15,000.