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I uploaded a PDF of an article in
this post that discussed one version of the Babbitting process. Here's what it says about peening:
Quote:
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After the bearings were poured the Ford/Wilson method required that the bearing be peened immediately. There are two reasons for this. They had to do with the chill pour method. Immediately after the pour the babbitt would shrink away (microscopic in size) from the cooler surface of the block and cap. Peening stretched it back in place. Secondly it insured good contact with the bearing saddle. Good adhesion is most important for the bearings to remain in place, to avoid being cracked during the operation of the motor and helping to dissipate heat from the bearing into the block. The peening is done while the bearing is still warm and soft.
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