2.5-LITRE DIESEL (1984 - 1991)

Land Rover Monthly - - Guide To Defender Engines -

THE STRONG bot­tom end of the 2.25-litre en­gines, com­bined with a rep­u­ta­tion for reli­a­bil­ity, gave Land Rover the con­fi­dence to up the torque by in­creas­ing the stroke to pro­duce a 2495cc ca­pac­ity. The cylin­der head was re­designed mainly to re­duce emis­sions and noise lev­els. In the quest for lower emis­sions, weight was re­duced by in­tro­duc­ing alu­minium ex­ter­nal com­po­nents in­clud­ing the new front cover which now housed a camshaft drive belt, re­plac­ing the old chain drive. The cam belt also drove a new Lu­cas CAV self-prim­ing in­jec­tion pump, which gave more pre­cise fu­elling, im­proved fuel con­sump­tion and needed less cor­rec­tive main­te­nance. The pack­age im­proved top speed and ac­cel­er­a­tion over the 2.25 en­gine.

De­spite new pis­ton cool­ing jets, pis­ton over­heat would be­come an is­sue for rea­sons un­re­lated, as we’ll see later. A screw-on oil fil­ter in place of the old car­tridge plus other re­fine­ments made ser­vic­ing eas­ier. A more ef­fi­cient heater plug sys­tem im­proved cold start­ing.

Al­though su­per­seded by the tur­bocharged ver­sion, and later the 200Tdi, this 2.5 nat­u­rally-as­pi­rated diesel con­tin­ued in mil­i­tary ser­vice un­til 1994, mainly be­cause the 200Tdi en­gine would not ac­cept the mil­i­tary 24-volt elec­tri­cal gen­er­a­tor. • A worth­while and cost-ef­fec­tive

devel­op­ment of the famous 2.25-litre diesel • Im­proved per­for­mance, though still

very agri­cul­tural

• Tim­ing belt adds to ser­vice re­quire­ments • Poor ser­vic­ing could re­sult in the en­gine run­ning on its own lu­bri­cat­ing oil, thus burn­ing pis­ton crowns

65.5 bhp at 4000 rpm 113 lb-ft at 1800 rpm

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