FUEL SYSTEM - N.8Fig. N.13.1.Drive Shaft.6.Maximum Speed Screw.2.Fuel Outlet.7.Fuel Inlet.3.Stop Lever.8.Injector Pipe Connections4.Idling Screw9.Bleed Screws.5.Speed Control Lever.10.Inspection Cover Plate.11.Scribed Line.When fitting a replacement fuel pump, or in theevent of the maximum speed screw having been movedfor any reason, the maximum no load speed must bechecked and re-set as necessary.The maximum no load speed will depend upon thetype of application to which the engine is fitted, and fordetails of this, reference should be made to the codenumber stamped on the fuel pump data plate. The lastfour numbers in the code indicate the speed required,and in the case of the example quoted below, this wouldbe 2660 rev/min.Code Example:—PS66/500/2/2660NOTE: If the fuel pump data plate is damaged ordefaced so as to make it impossible to read thecode, or if the code is not stamped on the plate, youare advised to contact your nearest PerkinsDistributor, or alternatively, Service Dept., PerkinsEngines Limited, Peterborough, to obtain the correctmaximum no load speed setting.To set the maximum no load speed the followingprocedure should be adopted:—1.Check the fuel system for leaks and rectify asnecessary. Ensure that no air is present in thesystem.2.Run the engine at part throttle until full operatingtemperature has been reached.3.Place a tachometer with a suitable extensionand drive adaptor in the centre of the crankshaftpulley retaining screw.4.Open the throttle until the maximum speed,given on the pump data plate, is obtained. If thespeed will not reach this figure, turn themaximum speed screw anti-clockwise until therequired speed is obtained. Should it bepossible to obtain a higher speed, turn themaximum speed screw clockwise until the speedis reduced to the required figure. Re-seal themaximum speed screw.IMPORTANT.Under no circumstances should theengine be allowed to operate at
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