Editing Triumph 2000 (section)

==<span class="anchor" id="Triumph 2000 Mk 1"></span>Triumph 2000 Mk 1 & 2.5 PI Mk 1 ==
{{Infobox automobile
| name = Triumph 2000 Mk 1 <br> Triumph 2.5 PI Mk 1
| image = 1967 Triumph 2000.jpg
| caption = 1967 Triumph 2000 Mk 1 Saloon
| production = 1963–1969 (2000) <br>120,645 produced <br> 1968–1969 (2.5 PI) <br> 9,029 produced
| body_style = 4-door [[Sedan (car)|saloon]] <br> 5-door [[Estate car|estate]]
| engine = 1,998 cc [[straight-6]] (2000) <br> 2,498 cc [[straight-6]] (2.5 PI)
| transmission = manual 4-speed gearbox (overdrive optional)<ref name=Autocar1973/> or <br/> automatic Borg-Warner Type 35<ref name=Autocar1973/>
}}

The Mk 1 was presented to the public at the [[London Motor Show]] in October 1963, and volume sales began in January 1964. Continuing in production until 1969, this version came in [[sedan (car)|saloon]] and, from 1965, [[station wagon|estate]] forms. The estate car body shell was partly built by [[Carbodies]],<ref name="Munro">{{cite book |title=Carbodies The Complete Story |author=Bill Munro |publisher=The Crowood Press |year=1998 |isbn=1-86126-127-6}}</ref>{{rp|119}} and in the Mk 1 version was the same length as the saloon. Various minor improvements were made during the period of which the most noteworthy, probably, was a significant upgrade in October 1966 to the "previously rather ineffective" ventilation, with eyeball vents added in the centre of the facia and the heater controls repositioned beneath them.<ref name=Autocar196712>{{cite magazine|title = Used Car Test: Triumph 2000 (overdrive)| series = 127|magazine=[[Autocar (magazine)|Autocar]] | volume =  (nbr 3750)| pages =  20–21|date = 28 December 1967 }}</ref>

In October 1968<ref>{{cite news|title=Triumph|work=[[The Times]]|date=1 October 1968| page=9|issue=57370}}</ref> the 2.5 PI (petrol injection) Mk 1 was launched, fitted with a [[Lucas Automotive]] mechanical [[fuel injection]] system. Performance was very good, but the PI models (along with the TR6 models) gained a reputation for unreliability and poor [[Fuel economy in automobiles|fuel economy]].

In Australia, these models suffered badly because of the summer heat.  The electric fuel pump commonly overheated causing fuel to vaporise and render the engine inoperable until the pump cooled down.  The overheating of the pump was caused by a combination of very high pressure fuel loads (over {{convert|110|psi|bar|abbr=on}}) and a pump that was adapted from what was originally a windscreen wiper motor. As such, it did not cope well with sustained pressures in moderate to high ambient temperatures.  Because of the launch late in the Mk&nbsp;I's life, there are relatively few PIs in the original shape.

<gallery widths="200px" heights="150px">
File:Triumph Estate (2368440169).jpg|Triumph 2000 (Mk 1) Estate 
File:Triumph 2.5 PI.jpg|Triumph 2.5 PI Mk 1 Saloon
</gallery>
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