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Engine crank web deflection.
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9.1. What do you know about engine crank web deflection? There are four limitation’s areas of crank web deflection depend of piston stroke (as per drawing below).
9.1.1. Satisfactory alignment: 
9.1.2. Acceptable alignment: 
9.1.3. Realignment recommended: 
9.1.4. Realignment essential: 
Where: S (mm) – piston stroke.
9.2. How to found the engine main bearings condition and engine foundation, frame & crankcase alignment?
if: 
– the engine main bearings condition and engine foundation, frame & crankcase alignment are satisfactory;
if: 
– main bearing is oval / eccentric, main journal is oval / eccentric, main journal is floating, main bearing lower shell is worn out or engine foundation, frame & crankcase misaligned.
Where: T, B, P & S (mm) – crank web deflection measurement readings from the table below;
aS (mm) – satisfactory alignment.