>> Triumph crankshafts are notoriously difficult to treat by Nitriding or
>> Tuftriding, beacause they haven't enough carbon in the steel (I think
>> that's the reason, anyway!). Kas Kastner (who I reckon knows more about
>> Triumph engines that most of us have forgotten) says "The standard
>> crankshaft is very reliable even in the pure stock form and does not
>> require any special modification..." Maybe he was just talking about racing
>> engines, but I guess if it was worthwhile to Nitride the crank he'd have
>> done it. We *always* used to do it with Mini cranks...
>
>The factory recommended Nitriding the crank for the TR engine if you
>planning to race it. The primary reason was to force the wear into the
>bearings and not the crank. The stell in the TR engine is notoriously
>soft and tend to wear right along with the bearings. Many such as Kas
>were not woried about this since parts were so cheap in the 60's that a
>new crank was a simple fix. Now the new crank requires a second
>mortgage.
Just shows how I shouldn't listen to those old wives... it was them told me
that you couldn't harden a TR crank by Nitriding.....
New TR5 or 6 crank? They're only about 130 UKpounds.
Richard Smith
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