Running Gear and Engine
The Mark X was the first Jaguar saloon to feature independent rear suspension. It used a wider-track version of Jaguar's IRS unit first seen on the E Type, which was subsequently used on Jaguar vehicles until XJ-S production ended in 1996. Front suspension used double wishbones with coil springs and telescopic dampers. Initially Jaguar's XK in-line six-cylinder engine was featured, with 3781 cc. A 9:1 compression ratio was standard, but an alternative 8:1 compression ratio was available as an option. For the London Motor Show in October 1964 the enlarged 4,235 cc unit took over, although the 3.8-litre unit could still be specified until October 1965. Triple SU carburettors were fitted, fed from an AC Delco air filter mounted ahead of the right hand front wheel.
Transmission options were manual, manual with overdrive or automatic. The arrival of the 4.2-litre power unit coincided with the introduction of a newly developed all-synchromesh four-speed gear box replacing the venerable box inherited by the 3.8-litre Mark X from the Mark IX which had featured synchromesh only on the top three ratios. Many domestic market cars and almost all cars destined for the important North American markets left the factory with a Borg Warner automatic gear-box. The 4.2-litre engine's introduction was also marked by a transmission upgrade for buyers of the automatic cars, who saw the Borg Warner transmission system switched from a DG to a Typ-8 unit. The power train was completed by a Thornton Powr-Lok limited-slip differential.
Stopping power for this heavy car came from power-assisted disc-brakes on all four wheels.
Power-assisted steering was standard, the later 4.2 cars receiving Adwest Varamatic variable ratio steering boxes.
Read more about this topic: Jaguar Mark X
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