The Leyland Comet was a long running badge used by Leyland for a series of trucks intended mainly for export markets. The name lives on in India, where Ashok Leyland still uses the badge today.
First generation
The semi-bonneted original Comet was first shown in December 1947. While intended mainly for export, it was also sold in the home market. The wheelbase is and the gross weight. A coach model seating 33, sharing the same front design, appeared in 1948. The cab was built by Briggs Motor Bodies and was shared with the Ford Thames ET6 and Dodge 100. Ford purchased Briggs in 1953, meaning Leyland were forced to develop new cabs. The original engines were a diesel or a petrol unit; the petrol version was rarely seen in Britain. In 1950 the diesel engine was updated to the new 5.76 litre Leyland O.350 unit, now with. Maximum weight was increased to ; models for tropical zones received a considerably lower rating. In 1955 the maximum power output was increased again, to at 2200 rpm, as the new O.350 Mk. III engine replaced the previous version.
Second generation
In 1952 a cab over version of the Comet became available. This was sold next to the bonneted model until 1955/56, depending on the market. As for the bonneted version, power from the Leyland O.350 engine went from in 1955. This model continued in production until 1958, although Australian models continued to use this cab into the early 1960s. This model also entered production in India after having received government approval in 1951. Ashok Motors, Ashok Leyland after 1954, manufactured it locally. The original front clip design remained in use into the early 1970s. Ashok Leyland proceeded to develop a simplified local cab design and continued to build the Comet into the 1990s.
Third generation
In 1958, as part of an effectivization program, the Comet received a new cab - called the "Vista Vue" cab, it was developed by Albion for a variety of their models. Dodge UK also used it for their 300 model, consequently this cabin shape is often referred to as the "LAD" design. There was also a heavier duty "Super Comet" model introduced, which eventually largely supplanted the "regular" Comet. Also in 1958 the 375 engine, based on the preceding design and rated at 110 hp, became available in the "Vista Vue" cab. Following this, a redesigned engine with cross-flow cylinder head was released. Initially it was a 370 at 110 hp, followed by a 400 option at 125 hp.
After a decade and a half in retirement, the "Comet" label was reintroduced in 1986. Again, the model was intended specifically for export markets, with simplified equipment, fewer gears, and a sturdy construction. The design is an all-metal version of the C44 Roadrunner, again simplified in order to make local assembly easier. The design consists of six major pressings, and was designed so as to allow for hand welding on a simple jig. The chassis is made of straight rails. The six-wheeled version is called the "Super Comet". The Comet was part of a new rationalised range and replaced the Terrier, Boxer, Reiver, Landmaster, and Clydesdale models - although there was some resistance to retiring these classic model names in markets where they had a good reputation. Leyland's previous "export special", the Landmaster, had been of a bonneted design, but Leyland determined that the bonneted design was becoming less favored across developing markets. Models ranging from received the 6-98 NV engine. The has the Leyland 402, while the heavier model and the Super Comets have the Leyland 411. With only five speeds, the top speed of a 1986 12-tonne Comet is a mere, but this was more than sufficient for conditions in the markets targeted. The primary markets intended for the Comet were English-speaking countries in Sub-Saharan Africa and also some Middle Eastern markets. The Caribbean, Latin America, and Singapore also received some Comets.
