This view shows a crack that runs down one of the side faces and into a longitudinal groove on the side. Red arrows mark the ends of the crack.

This is a closer view of the crack as seen in a top-down view. The two red arrows indicate the ends of the crack.

This view shows the crack that runs down the other side face and into longitudinal groove. Red arrows mark the ends of the crack.

This is a view of a water line crack. The green circle indicates the fracture surface of one of the cracks that is radiating from the water cooling line that was exposed.

This is a close view of cracks radiating from a cooling line. Red arrows indicate cracks emanating from the cooling line at the 3:00 o’clock and 9:00 o’clock positions. The crack at the 9:00 o’clock position is about 5/16” long, while the crack at the 3:00 o’clock position is approximately 1/2” long.

This is a 50x magnification view of the cross-section of a water line fracture origin. The fracture surface is just to the right. Note that there are several other cracks seen in this cross-section through the valley. The multiplicity of cracks offers evidence that the insert experienced high service stresses.