The Land Rover Defender is a British four wheel drive off-road utility vehicle.
The product of continued development of the original Land Rover Series I launched in 1948, it uses the basic yet robust underpinnings of a ladder frame chassis and aluminium body and is available in a huge variety of body types from the manufacturer, plus many more specialist versions such as fire engines.
While perhaps best associated with expeditions, Defenders are also used variously in agriculture, industry and the military. In recent years the model has been increasingly utilised as a private car.
Name and badge distinctions
The Defender name was not adopted until 1990 as a measure to distinguish the utility Land Rover model from the Discovery and Range Rover. Between 1983 and 1990 the coil-sprung utility Land Rovers were officially known as the Land Rover Ninety or One Ten, with the number spelled out in full in advertising and in handbooks and manuals. These vehicles also carried badges above the radiator grille which read Land Rover 90 or Land Rover 110, with the number rendered numerically. From late 1989, following the introduction of the Discovery, the front badge simply said 90 or 110. From 1991, when the Defender name was adopted the vehicles became the Defender 90 or the Defender 110. These carry front badges that say Defender, with a badge on the rear of the vehicle saying Defender 90 or Defender 110.
The 127-inch (3,226 mm) wheelbase Land Rover 127 available from 1985 was always marketed with the name rendered numerically. Following the adoption of the Defender name, it became the Defender 130, although the wheelbase remained unchanged.
In the United States and Canada, North American Specification (NAS) Defenders sold between 1989 and 1997 said only 'Land Rover' with no '90' or '110' numeric designation.
Hand assembly
Something of an anachronism in the 2000s, the Defender has no unibody structure and is still largely hand assembled. All its major body panels and sub-assemblies simply bolt together. Thus not only can a Defender be literally broken down to its chassis with simple hand tools there are no irreplaceable stress points. While appreciated in the field and by enthusiasts, this method of manufacture has become increasingly expensive relative to unibody and modular construction.
[edit]Land Rover Ninety & One Ten
Ninety, One Ten & 127 |
| Production | 1983–1990 |
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| Body style(s) | 2-door station wagon
4-door station wagon
2-door pickup
2-door van |
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| Engine(s) | 2.3 L 75 hp (56 kW) I4 petrol (1983–1985)
2.3 L 62 hp (46 kW) I4 diesel (1983)
2.5 L 68 hp (51 kW) I4 diesel (1984–1993)
2.5 L 83 hp (62 kW) I4 petrol (1985–1993)
2.5 L 85 hp (63 kW) I4Turbodiesel (1986–1990)
3.5 L 113 hp (84 kW) V8 petrol (1983–1986)
3.5 L 134 hp (100 kW) V8 petrol (1986–1993) |
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| Transmission(s) | LT95 4-speed manual (One Ten early V8 engines only)
LT77 5-speed manual
LT85 5-speed manual (Ninety and One Ten V8) |
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| Wheelbase | 92.9 in (2360 mm) (Ninety)
110 in (2794 mm) (One Ten)
127 in (3226 mm) (127) |
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| Length | 160.5 in (4077 mm) (Ninety)
181.1 in (4600 mm) (One Ten) |
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| Width | 70.5 in (1791 mm) |
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| Height | 80.2 in (2037 mm) (Ninety)
84 in (2134 mm) (One Ten) |
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| Related | Land Rover Wolf
Santana PS-10 |
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Production of the model now known as the Defender began in 1983 as the Land Rover One Ten, a simple name which reflected the 110 inch (2.794 m) length of the wheelbase. The Land Rover Ninety, with 93 inch (2.362 m) wheelbase, and Land Rover 127, with 127 inch (3.226 m) wheelbase, soon followed.
Outwardly, there is little to distinguish the post-1983 vehicles from the Series III Land Rover. A full-length bonnet, revised grille, plus the fitting of wheel arch extensions to cover wider-track axles are the most noticeable changes. While the engine and other body panels carried over from the Series III, mechanically the Ninety and One Ten showed significant modernisation, including:
- Coil springs, offering a more comfortable ride and improved axle articulation
- A permanent four-wheel drive system borrowed from the Range Rover, featuring a two-speed transfer gearbox with a lockable centre differential
- A modernised interior
- A taller one-piece windscreen
In addition, a new series of progressively more powerful and more modern engines were designed for future use.
The One Ten was launched in 1983, and the Ninety followed in 1984. From 1984, wind-up windows were fitted (Series models and very early One Tens had sliding panels), and a 2.5 litre, 68 hp (51 kW) diesel engine was introduced. This was based on the earlier 2.3 litre engine, but had a more modern fuel-injection system as well as increased capacity. A low compression version of the 3.5 litre V8 Range Rover engine was available too which transformed performance.
This period saw Land Rover market the utility Land Rover as a private recreational vehicle. Whilst the basic pick-up, Station Wagon and van versions were still working vehicles, the County Station Wagons were sold as multi-purpose family vehicles, featuring improved interior trim and more comfortable seats. This change was reflected in Land Rover starting what had long been common practice in the car industry - detail changes and improvements to the County model from year to year in order to attract new buyers and to encourage existing owners to trade in for a new vehicle. These changes included different exterior styling graphics and colour options, and a steady trickle of new "lifestyle" accessories that would have been unthinkable on a Land Rover a few years ago, such as radio/cassette players, styled wheel options, headlamp wash/wipe systems and new accessories such as surfboard carriers and bike racks. The switch from leaf spring to coil spring suspension was crucial to the new models' success. It offered improved off-road ability and load capacity for traditional commercial users, whilst the improved handling and ride comfort now made the Land Rover attractive to the general public.
[edit]The 127 and 130
From 1985 Land Rover introduced a third wheelbase to its utility line-up, a 127-inch (3,226 mm) twin-axle vehicle designed to accommodate larger, heavier loads than the One Ten. Naturally called the Land Rover 127, it was designed specifically with use by utility and electrical companies in mind, as well as military usage. In its standard form it is a five-door six-seater consisting of the front half of a One Ten Station Wagon, and the rear of a One Ten High-Capacity Pick Up (HCPU). The logic was that this allowed a workcrew and their equipment to be carried in one vehicle at the same time. The 127 could carry up to 1.4 tons payload, compared to the 1.03 tons payload of the One Ten and the 0.6 tons of the Ninety.
127s were built on a special production line, and all started life as One Ten Station Wagon chassis (the model was initially marketed as the One Ten Crew Cab, before the more logical 127 name was adopted). These were then cut in two and the 17 inches (432 mm) of extra chassis length welded on before the two original halves were reunited. 127s did not receive their own dedicated badging like the other two models, instead they used the same metal grille badges as used on the Series III 109 V8 models, that simply said Land-Rover.
Although the standard body-style was popular, the 127 was a popular basis for conversion to specialist uses, such as mobile workshops, ambulances, fire engines or even flatbed transports. In South Africa, the Land Rover assembly plant there offered a 127 Station Wagon with seating for 15. Land Rover also offered the 127 as a bare chassis, with just front bodywork and bulkhead, for easy conversion.
Initially held back by the low power of the Land Rover engines (other than the thirsty V8 petrol engine), the 127 benefited from the improvements to the line-up, and by 1990 was only available with the two highest power engines, the 134 hp (100 kW) 3.5 litre V8 petrol, and the 85 hp (63 kW) 2.5 litre Diesel Turbo.
[edit]Engine development
The original One Ten of 1983 was available with the same engine line-up as the Series III vehicles it replaced, namely 2.25 litre petrol and diesel engines, and a 3.5 litre V8 petrol unit. The intention had always been to provide more powerful engines as soon as the new vehicles had found their feet and the Series III had ceased production. Indeed, in 1981 the 2.25 litre engines had been upgraded from 3- to 5-crankshaft bearings in preparation for the planned increases in capacity and power.
The 2.5 litre version of the diesel engine, producing 68 hp (51 kW), was introduced in both the One Ten and the newly-arrived Ninety. This was a long-stroke version of the venerable 2.25 litre unit (the new version displaced 2495 cc), fitted with updated fuel injection equipment and a revised cylinder head for quieter, smoother and more efficient running. A timing belt also replaced the older engine's chain.
In 1985 the petrol units were upgraded. An enlarged 4-cylinder engine was introduced. This 83 hp (62 kW) engine shared the same block and coolingsystem (as well as other ancillary components) as the diesel unit. Unlike the diesel engine, this new 2.5 litre petrol engine retained the chain-drivencamshaft of its 2.25 litre predecessor. At the same time, the 114 hp (85 kW) V8 was also made available in the Ninety- the first time a production short-wheelbase Land Rover had been given V8 power. The V8 on both models was now mated to an all-new 5-speed manual gearbox.
1986 saw an important development. For many years Land Rovers had been criticised for their low-powered engines, which, despite the recent improvements, still lagged a long way behind much of the competition. Designed to be simple and durable, the engine had worked for decades, but the venerable engines began to feel old-fashioned and underpowered in an era of high horsepower motors. Drivers were less inclined to use the gearbox to compensate for the older motor's relative lack of power. The "Diesel Turbo" engine was introduced to make up for this long-standing shortfall. The engine was essentially a lightly-turbocharged version of the existing 2.5 litre diesel, with several changes to suit the higher power output, including a re-designed crankshaft, teflon-coated pistons and nimonic steel exhaust valves to cope with the higher internal temperatures. Similarly, an 8-blade cooling fan was fitted, together with an oil cooler. The 2.5 diesel, 2.5 petrol and Diesel Turbo engines all shared the same block castings and other components such as valvegear and cooling system parts, allowing them to be built on the same production line. The Diesel Turbo produced 85 hp (63 kW), a 13% increase over the naturally-aspirated unit, and a 31.5% increase in torque to 150 lb·ft (203 N·m) at 1800 rpm. This finally provided a powerful yet economical powerplant for the vehicle. Externally, turbodiesel vehicles differed from other models only by having an air intake grille in the left-hand wing to supply cool air to the turbo. The engine was only intended to be a short term solution to compete with more advanced Japanese competitors, but was quickly adopted as the standard engine for UK and European markets.
Early turbodiesel engines gained a reputation for poor reliability, with major failures to the bottom-end and cracked pistons. A revised block and improved big end bearings were introduced in 1988, and a re-designed breather system in 1989. These largely solved the engine's problems, but it remains (like many early turbodiesels) prone to failure if maintenance is neglected. Well-maintained engines are capable of long service lives in excess of 150,000 miles (240,000 km). Despite its early problems, the Diesel Turbo was a popular engine choice in its time, especially since it offered improved power, torque and economy over the 2.5 litre petrol engine. Contemporary road-testers compared the engine favourably to its Japanese competitors, despite the age of the basic design. Whilst not being able to match the performance of a V8-engined Land Rover, the Diesel Turbo provided adequate performance for most commercial and private buyers and was a key aspect in Land Rover's sales revival (see below).
At the same time that the Diesel Turbo was introduced, the V8 engine was upgraded. Power was increased to 134 hp (100 kW), and SU carburettors replaced the Zenith models used on earlier V8s
Defender
Land Rover Defender |
| Production | 1990-present |
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| Body style(s) | 2-door station wagon
4-door station wagon
2-door Single Cab pickup
4-door Double Cab pickup
2-door Hardtop |
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| Engine(s) | 2.5 L 107 hp (80 kW) I4 turbo diesel (1990-1994)
2.5 L 111 hp (83 kW) I4 turbo diesel (1994-2007)
3.9L 182 hp (136 kW) V8 petrol
2.5 L 122 hp (91 kW) I5 turbo diesel
2.4 L 122 hp (91 kW) I4 turbo diesel |
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| Transmission(s) | LT77 5 speed manual
R380 5 speed manual
ZF4-HP22 4 speed automatic
6-speed manual |
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| Wheelbase | 92.9 in (2360 mm) (1990s 90)
93 in (2362 mm) (2000s 90)
110 in (2794 mm) (110)
127 in (3226 mm) (130) |
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| Length | 144 in (3658 mm) (90 pickup)
153 in (3886 mm) (2000s 90)
172 in (4369 mm) (110 Pickup)
182.3 in (4630 mm) (2000s 110)
183 in (4648 mm) (110 Hardtop)
174.7 in (4437 mm)
157.1 in (3990 mm) (1997-2000s 90)
160.5 in (4077 mm) (1990-94 90)
181.1 in (4600 mm) (1990s 110) (130 Double Cab)
204 in (5182 mm) (130) |
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| Width | 70.5 in (1791 mm) (1990s)
70 in (1778 mm) (2000s 90) |
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| Height | 80 in (2032 mm) (2000s 90)
80.2 in (2037 mm) (1990s 90)
90.0 in (2286 mm) (110) |
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| Related | Land Rover Wolf
Santana PS-10
Iveco Massif |
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The biggest change to the Land Rover came in late 1990, when it became the Land Rover Defender, instead of the Land Rover Ninety or One Ten. This was because in 1989 the company had introduced the Discovery model, requiring the original Land Rover to acquire a name. The Discovery also had a new turbodiesel engine. This was also loosely based on the existing 2.5 litre turbo unit, and was built on the same production line, but had a modern alloy cylinder head, improved turbocharging, intercooling and direct injection. It retained the block, crankshaft, main bearings, cambelt system and other ancillaries as the Diesel Turbo. The breather system included an oil separator filter to remove oil from the air in the system, thus finally solving the Diesel Turbo's main weakness of re-breathing its own sump oil. The 200Tdi as the new engine was called produced 107 hp (80 kW) and 188 lb·ft (255 N·m) of torque, which was nearly a 25% improvement on the engine it replaced (although as installed in the Defender the engine was de-tuned slightly from its original Discovery specification (111 horsepower) to suit the prolonged periods of low speed, high revving operation that Land Rovers experienced in commercial use, such as when towing heavy loads).
This engine finally allowed the Defender to cruise comfortably at high speeds, as well as tow heavy loads speedily on hills while still being economical. In theory it only replaced the older Diesel Turbo engine in the range, with the other 4-cylinder engines (and the V8 petrol engine) still being available. However, the Tdi's combination of performance and economy meant that it took the vast majority of sales. Exceptions were the British Army and some commercial operators, who continued to buy vehicles with the 2.5 litre naturally-aspirated diesel engine (in the Army's case, this was because the Tdi was unable to be fitted with a 24 volt generator). Small numbers of V8-engined Defenders were sold to users in countries with low fuel costs or who required as much power as possible (such as in Defenders used as fire engines or ambulances).
Along with the 200Tdi engine, the 127's name was changed to the Land Rover Defender 130. The wheelbase remained the same; the new figure was simply a tidying up exercise. More importantly, 130s were no longer built from "cut-and-shut" 110s, but had dedicated chassis built from scratch.
1994 saw another development of the Tdi engine, the 300Tdi. This was the same capacity, and both the Defender and the Discovery had engines in the same state of tune, 111 bhp (83 kW), 195 ft·lbf (264 N·m), and had the same basic layout, but had over 200 changes to improve the refinement and on-road performance of the engine. However, in the process the economy of the engine was reduced slightly, as was the ability for it to be serviced by the owner.
Throughout the 1990s the vehicle attempted to climb more and more upmarket, while remaining true to its working roots. If ordered without any optional extras, the Defender was a basic working tool. If the owner so wished, any number of options and accessories could transform it into a vehicle that was perfectly acceptable as an everyday method of transport, while still retaining excellent off-road abilities. This was epitomised by limited edition vehicles, such as the SV90 in 1992 with roll-over protection cage, alloy wheels and metallic paint and the 50th Anniversary 90 in 1998 equipped with automatic transmission, air conditioning and Range Rover 4.0 litre V8 engine.
A new variant was the Defender 110 Double Cab, featuring a Station Wagon style seating area, with an open pick up back. Although prototypes had been built in the Series days, it was not until the late 1990s that this popular and adaptable vehicle finally reached production.
Military Defenders
Defender 110 patrol vehicles
Land Rover Defender vehicles have been used extensively by many of the world's military forces, including the US in some limited capacity, following experience with the vehicle during the first Gulf War, where US forces found the British Army's vehicles to be more capable and better suited to operation in urban areas and for air-lifting than the Humvee. The British Army has used Land Rovers since the 1950s, as have many countries in theCommonwealth of Nations. The British Army replaced its Series III fleet with One Tens in 1985, with a smaller fleet of Nineties following in 1986. Both used the 2.5 litre naturally-aspirated diesel engine. These older vehicles are reaching the end of their service lives, with many being sold onto the civilian market from the late 1990s.
In 1994 Land Rover created the Defender XD (XD= eXtra Duty) to replace and complement these vehicles. Powered by 300Tdi engines, the XD has a much stronger chassis, with fibre webbing around the welded joints in the chassis and around stress points to massively increase load capacity. The XD was available both in Defender 90 and 110 forms and known to the British Army as Land Rover Wolfs. Usually 110-inch (2,794 mm) Soft or Hard Tops, they are used for patrol, communications and supply duties. 90XDs are less common, but are generally ordered as Soft Top or Hard Top vehicles for light liaison and communications. Short-wheelbase vehicles lack the load capacity needed by modern armies, and the increased power of heavy-lift helicopters has made the larger 110s easily air-transportable- a historic advantage of the smaller, lighter 90.
Land Rover always offered its "Core" military Defenders with the 300Tdi engine rather than the more powerful but more complicated Td5 engine offered in civilian vehicles. Before the 300Tdi engine was introduced, military Land Rovers were offered with 2.5 litre petrol and diesel engines, as well as the 3.5 litre V8 petrol. Although trials with the Td5 engine proved it to be reliable in battlefield conditions, it was decided that servicing and repairing its electronic control systems should they fail was too complicated and reliant on having diagnostic computers available. Land Rover were also unable to guarantee they could make the Td5 resistant to electro-magnetic interference. The Australian Army also tested the Td5 and found it to be reliable, but was concerned that the extra performance and speed that the engine gave would result in more accidents and vehicle damage on rough tracks when driven by inexperienced drivers, so opted for the older engine as well.
The British police have used Land Rovers (including the Defender) in their service for many years, they are supplied with the entire range from Land Rover itself.
In 2004 a fleet of 12 Long wheelbase 110 Td5 Land Rovers were produced for the central German Government, varying between 110 Vans, 110 Hi-capacity pick-ups and 110 Station wagons. The German Government did not renew the supply contract after 2006 instead turning to Mercedes for their logistics fleet.
Vehicles produced for the German Government order were produced in metallic grey with white roofs. The electrical installation on these vehicles was a special order and kept "luxury" fittings and fixtures to a bare minimum. Four FFR equipped vehicles were produced to facilitate the VHF radios in service at that time with the German Government and Police authorities. Following the change-over to the Mercedes contract, the German Central Government sold their Td5 fleet.
With 300Tdi production stopping in 2006, Land Rover is currently gearing up production of a military version of the 4-cylinder DuraTorq engine that is also used as a replacement for the Td5 in civilian vehicles.
The British Army's Land Rovers have been the subject of much criticism following recent operations in Iraq and Afghanistan. The majority of British Service Land Rovers carry no armour-plating and the composite armoured SNATCH Land Rover (originally designed to withstand small arms fire and hand-launched projectiles as experienced in Northern Ireland) is not immune to the larger roadside bomb and rocket attacks. Some have called for British troops to be equipped with Humvees, or other such vehicles. However, similar criticisms have been levelled at the American vehicle. Other proposals include the South African made RG-31 or similar larger and more heavily armoured trucks or armoured vehicles that provide greater protection.
There have been many rumours about a replacement vehicle type. This is most likely the larger, higher-capacity 4x4 or 6x6 Pinzgauer forward-control vehicle similar to the now disusedLand Rover 101 Forward Control, given that the current Land Rover design is also reaching its weight limits due to the increasing amounts of communications and weapons gear used by modern patrol forces.
