I have a crank pin cavity that is 9.5mm.
I have a screw-driver I'm using as a pin, with shaft that is 6mm in diameter.
I want to be sure that the pin width is sufficient to lock the engine whilst I loosen the crank pulley bolt.
Is there a general rule of thumb to minimize any risk to engine internal parts e.g. crank journals?
For example what if the bolt is a bit stiff? Perhaps a torque wrench would help to guage whether I'm applying too much pressure to loosening the crank bolt.