Triumph Dolomite
Introduced in 1972 to succeed the front-wheel-drive 1300/1500 family, the rear-wheel-drive Triumph Dolomite was an executive compact sports saloon clothed in a sharp Giovanni Michelotti four-door monocoque body. The range spanned sensible 1300 and 1500 entry models, the refined overhead-camshaft 1850, and the legendary 1973 Dolomite Sprint. Developed under Spen King, the Sprint was an engineering milestone: the world's first mass-produced multi-valve road car, producing 127 bhp from a 2.0-litre slant-four using sixteen valves operated from a single camshaft. Equipped with a luxurious wood-veneered dashboard, plush cloth or vinyl seating, and optional Laycock overdrive, the Dolomite delivered pace that challenged the contemporary BMW 2002 and won the British Saloon Car Championship. Surviving Dolomites require careful vigilance against bulkhead rust, cooling system neglect, and carburettor mount degradation.
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Common Faults & Reliability
These are the most common documented problems for the Triumph Dolomite, sorted by their typical impact and frequency.
Slant-four alloy cylinder head warping and head gasket failure
high severityThe 16-valve Sprint and 8-valve 1850 slant-four engines utilise an aluminium cylinder head mounted atop an inclined cast-iron block. The diagonal angled head studs and high thermal stresses make the engine exceptionally vulnerable to overheating. A lack of high-specification corrosion-inhibited antifreeze allows electrolytic corrosion of the aluminium castings, silting up the radiator and blowing the head gasket.
Bulkhead and windscreen pillar junction corrosion
high severityThe monocoque shell of the Dolomite suffers from severe structural corrosion in the hidden junction where the windscreen A-pillar meets the bulkhead and inner wing. Water draining through deteriorated windscreen rubbers and blocked scuttle vents collects in this structural joint, rusting through multiple panels into the driver footwells and weakening the passenger safety cell.
Deteriorated rubber carburettor mounts causing lean running
medium severityOn Dolomite Sprint models, the twin 1.75-inch SU HS6 carburettors are isolated from engine vibration by rubber-to-metal sandwich mounting blocks. Over time, heat soak and fuel vapours cause the rubber to perish, split and delaminate. This admits unmetered air into the intake manifold, creating a dangerous lean fuel-air mixture that causes erratic idling, hesitation, and burnt exhaust valves.
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