[Mark in MT]

The steel front and center main caps are not peened, this would likely cause micro cracks in the bond between the Babbitt and the cap. The Babbitt poured into the cast iron parts needs to be peened as it shrinks as it cools, pulling away from the block or cap. Peening stretches it back into place so that it will be supported and have good heat transfer. I also peen the thrust surfaces to keep them tight on the ends, if you don't the peening stretches the Babbitt lengthwise in the bearing, actually loosening the bearing material on the ends. Having a support on the ends is nice if you have a good clamp, but can be done without.


Mark