If your engine is an ISB crawl under it and look for a "53" in raised numbers on the block. If you have it then cracking of the block is possible due to the walls being a little too thin. This is something that happens in a few percent of the cases and Cummins has assisted owners in replacing the block. I have a 53 block and have had no problems so far which is 11 years. Let us know what you find.
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Jim Walker
N Virginia
2014 Palazzo 33.2
Cummins 6.7 ISB, Allison 2100 6 Speed
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