Three Bearing Crank Engine - Centre Bearing Question

[Jamie]

SqueaK: thank you for the link, which I shall read. In my post, "up" is away from the head and "down" is towards it: as far as I can ascertain, most crankshafts move downwards, towards the head when the middle cap is tightened. I am assuming that the engine is upside down. Doing this, I can see how to measure the deflection with a DTI or depth gauge. My question is how can you tell whether the crankshaft is being push upwards, away from the head, if the centre casting is inaccurately cast, but in the opposite direction? Then, tightening the centre cap will not deflect the crankshaft, yet it could still be slightly misaligned.

Jamie.