There should be no case pressure. The case is not full of oil it has a drain back to the main case for oil that is exausted from the motor pistons or leaks past the motor or pump pistons. If there is pressure bulding up in the case it would either have to be a restricted drain or pluged breather. I've rebuilt 5 or 6 of these using regular C/R seals without any problems with leakage.
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