Photo: Carniceros (ii)

Especially the 18 cylinders are highly stressed. They live in an environment, where their outside basks in air at -40C, and inside they handle hot and flaming gasses. Cylinder heads respond by cracking. Other parts break off, like exhaust valves within a cylinder which are squeezed between the piston and the head. Changing a broken cylinder head above your head are tedious affairs involving stripping off the air baffles, ignition components, fuel injection lines, exhaust stacks and manifold intake pipes.