Triumph Tr6 Problems & Known Issues

The TR6 uses a separate steel chassis with substantial side rails and cross-members that support the entire vehicle structure. The rear sections of the chassis rails are particularly vulnerable to corrosion from road salt, moisture, and debris accumulation. Rust typically develops from the inside out, making visual detection difficult until structural integrity is compromised. Failed MOT tests for chassis corrosion are common on surviving examples, with repair costs often exceeding the vehicle's value due to the extensive metalwork required.

The TR6 rear wheel bearings are large ball races housed in the rear hub carriers, with the differential drive flanges bolted to the hub assembly. These bearings experience higher loads than modern designs due to the solid rear axle configuration and wire wheel option creating additional stress concentrations. MOT data shows this model fails bearing tests at 57.6 times the national fleet average, indicating a fundamental design weakness or parts quality issue that has persisted across the classic car parts supply chain.

The TR6 rear differential is a Salisbury unit with crown wheel and pinion gears that are prone to wear, particularly when oil levels drop or contamination occurs. The differential experiences high loads from the torquey straight-six engine and aggressive driving characteristic of sports cars. Noise typically develops gradually as gear tooth contact patterns deteriorate, but can progress rapidly to complete failure if oil starvation occurs.

The TR6 front disc brake system uses single-piston Girling calipers that are vulnerable to piston seizure and slider pin corrosion. MOT data shows brake binding failures at 6.4 times the national fleet average, typically caused by corroded pistons sticking in their bores or seized slider mechanisms preventing proper pad retraction. The relatively simple brake design lacks the self-adjusting features of modern systems, making regular maintenance critical.