The crankshaft seal can work its way out. I use retaining liquid.
A new crankshaft bolt will be required as it is torqued to yield.
At least the crankshaft should be locked and ideally the camshafts too, but perhaps the bolt can be loosened before the camshaft belt is removed then the cam belt refitted before starting to tighten the new bolt. However as the bolt is very tight and torqued to specs, the crankshaft will have to be locked with an appropriate tool.


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