ForewordThis workshop manual has been compiled for use inconjunction with normal workshop practice. Mention ofcertain accepted practices, therefore, has beenpurposely omitted in order to avoid repetition.Reference to renewing joints and cleaning off jointfaces, has to a great extent been omitted from the text, itbeing understood that this will be carried out whereapplicable.Similarly, it is understood that in reassembly andinspection, all parts are to be thoroughly cleaned andwhere present, burrs and scale are to be removed.It follows that any open ports of high precisioncomponents, e.g., fuel injection equipment, exposed bydismantling, will be blanked off until reassembled, toprevent the ingress of foreign matter.When fitting setscrews into "through" holes into theinterior of the engine. a suitable sealant should be used.Engine NumberThree systems of engine numbering have beenused.On very early engines, the serial number consistedof seven digits commencing with the figure 4.With later engines, the number consisted of figuresand letters, e.g., 236:251. The first three figuresrepresent the capacity of the engine in cubic inches.The letter "1 " denotes the online was built in the UnitedKingdom and the last group of figures comprises theengine serial number.On current engines, the number can consist or up tofifteen letters and figures a typical number beingLD14739U510336D and will be found stamped on thecylinder block just above the fuel pumpPage V
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