2.5-LITRE DIESEL (1984 - 1991)
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Although superseded by the turbocharged version, and later the 200Tdi, this 2.5 naturally-aspirated diesel continued in military service until 1994, mainly because the 200Tdi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
• 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