So why strip each engine after initial build ? Welcome to the world of adverse tolerance stack up.

Now you will have the tolerance variation on everything, dimensions, materials, coatings, treatments and assembly. Each one of these has numerous sub categories I.e dimensions includes length, diameter, squareness, parallelism, flatness, concentricity, and more… Just one part, with one parameter at top acceptable tolerance is not a problem but get a number of these at the top limits and you maybe lucky and spot the assembly won’t go together but it could assemble with gaps critical for function being significantly compromised so will wear very rapidly or even crack.

When a complex assembly is designed it’s assumed all parts are in the middle of the tolerance range. Although you’re supposed to consider permutations of tolerance, in reality it’s massively time consuming on technical resources.

A great explanation, thank you.