Triumph TR6 Clutch Master Cylinder
The bore of the TR6 clutch master cylinder assembly changed, at body number 50910CP, from 3/4" (0.75) to 7/10" (0.70). This change very effectively lightened the clutch pedal load; the downside was that it aggravated the problem of insufficient clutch clearance on a mechanism that was worn or had a broken tapered pin in the cross shaft. The later, smaller bore diameter, master cylinders may be used to replace earlier types.
If a repair kit is required, before placing an order the cylinder bore diameter must obviously be identified. This is simply achieved by reading the size off the exterior of the cylinder.