Finally an improved conversion kit for the crankshaft seal that is 100% new and does not require crankshaft machining that fits the Triumph TR2, TR3, TR4 and TR4A. The uprated seal prevents the rear engine oil leakage from the old tractor style seal and blow by that is associated with high performance engines. With this improved conversion kit it is easy to install especially since this uprated style has been developed, machining of the crankshaft is no longer needed. No more worrying about trying to have your crank ground, just an easy install. Furthermore the original seal in shape of an oil return screw remains while at the same time the high-performance Viton shaft seal is used for long life. Leave puddles on the ground behind and install this uprated seal kit.