To start with are you needing a full width core or part width with the oil cooler along side. I suspect the D315 power unit is different.
Mine is a partial width cooling water core with the separate oil cooler. The parts book that I looked at in the library for the D315 power unit showed both the oil cooler and the partial width core for the cooling water for all serial numbers. The same diagram listed two different part numbers for the cooling water core with no explanation as to the difference between the numbers. I can see where they could have one number for a full width core and one for a partial width core but it is not clear on the diagram or the parts list if that is the case.
Thanks!
Check/compare the tube sheet gaskets. That may be a helpful indicator.
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