AUSMHLY
Yoda

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Those "ears" are for a manual starting handle. This basic engine was used on other BMC models, which may have had a provision for hand cranking. So, yes, you can use those for turning the engine over.
Hi Marty, You're more than welcome to post your question here, but there's also a Triumph Forum where you are more likely to find folks familiar with your subject. Cheers.Does anyone know the correct “crankshaft nut” size for a 1958 TR 3? The car has been sitting for 20+ years and I would like to see if the engine is seized-up. Planning to remove the spark plugs and add a little oil(?) to the cylinders before trying to turn over engine with a socket (size?) and extension/breaker bar. Thanks for any advice.